BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   brake issues Empty brake issues Wed Jun 06, 2012 6:29 pm

wez1

wez1
active member
active member
hi i have had my fill this is my first BMW got it cheap so nogripes was a non runner prooved to be a duff fuel pump but now getting ready for MOT and hey presto no brakes at the front:evil:

tried bleeding but got no further i would apreciate any advice on what issues there are with the brake system on these bikes as i have only had kwaks for the past 20 odd years

decided i need a shaft drive and what better than german build so please please any even so small thing i should try would be apreciated as all the lights connected to ABS are having a hayday to themselvesbrake issues 61740 blinking there heads off

in advance thanks to all hwo give advice Smile

    

2Back to top Go down   brake issues Empty brake issues Wed Jun 06, 2012 6:59 pm

RT

RT
Life time member
Life time member
Welcome wez1
first up, don't panic, it normally is the easy things that have cocked up.
You say no brakes, does that mean the brake lever pulls in without any pressure?, is there any release of fluid
down in the caliper or anywhere or maybe just the pistons are stuck in the caliper.
If you have worked on the Kwaka's brakes it shouldn't be too hard for you to pull it all apart. I'm a non mechanical person and still managed to renovate all my calipers and pistons etc with the help from these guys.
I found that I started with the brake lever, piston, master cylinder then brake lines and down to the caliper. Boy was I annoyed but in the end got it done.
I'm sure better people than me will chime in, but don't give up.
Cheers RT

    

3Back to top Go down   brake issues Empty Re: brake issues Wed Jun 06, 2012 7:20 pm

88

88
Life time member
Life time member
Welcome wez. There's a wealth of info in the download section but first you need to slide on over to the new members section and stick up an intro. After a few posts crazy frog will give you a password to access then downloads. Also you can do a google forum search on the portal page to find posts on a particular topic.
88KE


__________________________________________________
brake issues Ir-log11 88....May contain nuts!brake issues Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1100LT 1992 - AKA Big Red
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K1/RS - AKA Titan (unique hybrid by Andreas Esterhammer)
    

4Back to top Go down   brake issues Empty Re: brake issues Wed Jun 06, 2012 7:29 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@wez1 wrote:hi i have had my fill this is my first BMW got it cheap so nogripes was a non runner prooved to be a duff fuel pump but now getting ready for MOT and hey presto no brakes at the front:evil:

tried bleeding but got no further i would apreciate any advice on what issues there are with the brake system on these bikes as i have only had kwaks for the past 20 odd years

decided i need a shaft drive and what better than german build so please please any even so small thing i should try would be apreciated as all the lights connected to ABS are having a hayday to themselvesbrake issues 61740 blinking there heads off

in advance thanks to all hwo give advice Smile

Welcome to the forum. When you get a mo' please go to the 'Member's Introduction' page and tell us a bit about your bike, oh, and yourself too. And fill us in when you ask a question as to what exactly your bike is. It helps us to make an easier diagnosis if we have that basic bit of info, as it appears nowhere in your question post. Cheers.


__________________________________________________

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

5Back to top Go down   brake issues Empty Re: brake issues Wed Jun 06, 2012 8:42 pm

RicK G

RicK G
admin
admin
The brakes will work if the lights are blinking it can mean many things but it sounds like you need to fix the actual brakes first and then reset the ABS computer.
I pull the whole lot apart when I get a bike and clean the calipers and pistons and put new seals and O rings in and new pads as well.
Bleed the brakes starting with the ABS modulator and then to the calipers.
The front calipers can be quite difficult to bleed because of the crossover tube from right to left caliper. I have used a vacuum bleeder that I made but they are available from fleabay for around $40.
Once the brakes actually work again you can set about reseting the ABS computer.
Yeah also Wez put up what model of bike you have as it can help when giving help.
Depending on which model you have depends on how ABS is wired.



Last edited by Rick G on Wed Jun 06, 2012 9:52 pm; edited 1 time in total (Reason for editing : Bit more info)


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   brake issues Empty Re: brake issues Wed Jun 06, 2012 9:38 pm

krambo

krambo
Life time member
Life time member
Welcome to the forum Wez - you will find all the information that you need here. If you can't find what you need then just ask Wink


__________________________________________________
1984 BMW K100RT, 1993 BMW K1100LTIC,1982 Kawasaki KZ1100 Spectre
"Aut viam inveniam aut faciam." brake issues Uk-bmw12
http://www.its-personal.net
    

7Back to top Go down   brake issues Empty Re: brake issues Thu Jun 07, 2012 3:20 am

wez1

wez1
active member
active member
@RT wrote:Welcome wez1
first up, don't panic, it normally is the easy things that have cocked up.
You say no brakes, does that mean the brake lever pulls in without any pressure?, is there any release of fluid
down in the caliper or anywhere or maybe just the pistons are stuck in the caliper.
If you have worked on the Kwaka's brakes it shouldn't be too hard for you to pull it all apart. I'm a non mechanical person and still managed to renovate all my calipers and pistons etc with the help from these guys.
I found that I started with the brake lever, piston, master cylinder then brake lines and down to the caliper. Boy was I annoyed but in the end got it done.
I'm sure better people than me will chime in, but don't give up.
Cheers RT



hi i'm a panel beater and have years of experience in mechanics but this has dumfounded me i have checked everything i can think except the electrics.

problem is that when i clamp the pipe to the callipers i have good pressure but on release the pressure dwindles to near zero. just been reading another answer and think the tube bridging between callipers could be the problem will try again never thought of that lol.

    

8Back to top Go down   brake issues Empty Re: brake issues Thu Jun 07, 2012 3:50 am

charlie99

charlie99
VIP
VIP
wes ...you havent overfilled the master cylinder ?

if so the piston seal will just pull the fluid back up the lines as there is no valve action possible because of the vacume created by the bladder and lack of airspace .

other wise its pretty common that the master piston breather valve (valve situated pretty near a centimeter closer to the presure point of the master piston , different to the fluid feed to the piston assembly propper ) could be blocked with gunk not allowing the pump type action to happen ..
a clean out ...or probe of this hole can be acheived pretty easy from the filler top ...if you evacuate some of the fluid to see what you are doing ...and maybe a pipe cleaner as a probe ...
of corse change all the fluids once completed to keep the whole deal clean and happy .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Obrake issues Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

9Back to top Go down   brake issues Empty Re: brake issues Fri Jun 08, 2012 3:53 am

wez1

wez1
active member
active member
yeah done the usual and made sure it was all clean. am going to ahav another bash at it to day, trouble is that there is fluid coming out when bleeding and no sign of anu air in the syatem. i have pressure when i clamp the front brake pipe and when i release it then try pumping i get zero pressure on the line and that is xausing me my headache. after readin the comments all have posted so far(Smile thanks by the way to all) i am going to try to evacuate the connecting pipe and will then post result. lol

thanks

    

10Back to top Go down   brake issues Empty Re: brake issues Fri Jun 08, 2012 4:27 am

RicK G

RicK G
admin
admin
When you say clamp the front line I presume you mean that you put some vise grips on the rubber line and then try to pump and the master cylinder comes up with a hard lever.
There are 2 rubber lines the first at the master cylinder to the solid line going to the left side modulator and the other where the line from that modulator goes to the right side caliper.
Which one did you clamp because it either means the air is in the modulator and the calipers or just the calipers.
Bleeding the modulators is fairly easy and usually straight forward but as said before the calipers can be very difficult if not impossible.
The K100 I had till recently it was impossible and I made a vacuum bleeder and spent hours getting all the air out.
One thing I have done to other bikes that prooved difficult was to let the system settle overnight with the lever tied tightly to the handlebar, this apparently lets any air in the lines to rise back to the master cylinder.

Another trick is to use a lever to spread the pads so pushing the pistons back into the caliper forcing any air out then pump the calipers back onto the discs.

You can hold or tie the lever in and spread the pads on the right disc while bleeding the left caliper this forces the air to the left caliper then hopefully out of the system

One trick I used recently was to put a thick piece or rubber matting between the pad and disc (you need to use well worn pads to do this) and pump the lever till you get some sort of lever then bleed till fluid stops. This lets more fluid out each time so getting more air out.

One more thing is that the fitting at the master cylinder can sometimes hold air and needs bleeding by just holding the lever in and cracking the bolt. Often a lot of air will come out.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

11Back to top Go down   brake issues Empty Re: brake issues Fri Jun 08, 2012 7:16 pm

wez1

wez1
active member
active member
yeah RICK i think you got it right i just read your post after being at the brakes all day i tried all of the things you have mentioned and made on progress i finished up trying a few things one i did clamp the front pipe not the one leading to modulator. i get full pressure then.so i continued by taking each calliper and trying them on there own and they both work perfect and have normal pressure when attached to the master cylinder on their own but when i put them back on the bike the pressure is zero after riggoruos bleeding and rebleading i have near to nopressure so i am at a loss as to the fault the pressure is there when i clamp the front brake line and when irelease it and try it again the pressure is zero ihave no idea what ican be there is no air in the lines of that ia pretty sure . is it possible that yhe callipers are duff? cheers

will keep updating till i find it LOL but any more advice is very welcom if nothing else i can use bike as ballast on back of landy when offroading next week lol

    

12Back to top Go down   brake issues Empty Re: brake issues Fri Jun 08, 2012 7:27 pm

K-BIKE

avatar
Life time member
Life time member
Let's step back when you clamp the line leading from the master cylinder there is pressure and a hard lever, when you connect the lever direct to the callipers there is a hard lever and pressure? So that says to me the bit in the middle has air in it. When you bled the ABS modulator at the modulator did you get air out? Just had a silly thought when you bled the modulator you didn't by chance bleed the modulator for the rear brakes? Could you describe in detail how you are bleeding the system please just so we can be sure we are all thinking the same process.
Regards,
K-BIKE

    

13Back to top Go down   brake issues Empty Re: brake issues Fri Jun 08, 2012 9:45 pm

RicK G

RicK G
admin
admin
From what you say the line joining the calipers is the problem, just like I had.
Try removing the calipers and inverting them for a while to get the air out of the line, you may need to do it a few times.
One thing I did many years ago on a very stuborne car (MK2 Zephyr) was to connect a long tube from the futherest wheel to the top of the master cylinder and sat in the car ,read a book and pumped the pedal for an hour or more till all the air came out then moved to the next wheel.
I did end up with brakes but the guy next door did ask why I was sitting in the car reading when the house was more comfortable. He was very unmechanical and definately didn't understand the explanation at all and for evermore thought I was just strange, maybe he was right.

Dont worry about using new fluid till you get it right and then replace it with new.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

14Back to top Go down   brake issues Empty Re: brake issues Sat Jun 09, 2012 4:28 am

wez1

wez1
active member
active member
hi K Bike thanks but i did bleed the right modulator:) but the problem persists the idea of RICK is my thought to but i tried using seperate lines using a spliter and fitting bleed nipples to each calliper and bleeding seperatly and still get the same darned result i find it kind of wierd is there any other brake setup that will fit in there place with the abs still usable that is my idea next i need the bike to comute to uni (old student lol) so i have a few weeks to tinker around but would much prefer riding than fixing...

    

15Back to top Go down   brake issues Empty Re: brake issues Sat Jun 09, 2012 6:50 am

RicK G

RicK G
admin
admin
Check the rubber lines. This is starting to sound like a problem I struck a while ago with the rear brake. The rubber line had cracked at the fitting on the Modulator but didn't leak out but into the next layer of the hose causing a big bubble in the line and very poor brakes. Put the fingers round each line on the rubber right next to the fitting and pump the lever you may feel the line expanding as you pump.
It drove me nuts for hours and plenty of head scratching till I saw this bubble the size of a marble and BTW it can happen anywhere along the line but at the fittings is more common.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

16Back to top Go down   brake issues Empty Re: brake issues Sat Jun 09, 2012 5:31 pm

wez1

wez1
active member
active member
rubber lines are fine checked them over more than once but when finance is better o will be upgrading to braided lines for sure. got to find the problem first gave up today had to paint a couple of bike wheels and replace a doorskin on my uncle's mgb gt lol.need the cash for bits and bobs on the K but tomorrow i'm going to try some more stuff on the bike i am about mad trying Smile

    

17Back to top Go down   brake issues Empty Re: brake issues Sat Jun 09, 2012 5:32 pm

wez1

wez1
active member
active member
rubber lines are fine checked them over more than once but when finance is better o will be upgrading to braided lines for sure. got to find the problem first gave up today had to paint a couple of bike wheels and replace a doorskin on my uncle's mgb gt lol.need the cash for bits and bobs on the K but tomorrow i'm going to try some more stuff on the bike i am about mad trying Smile

    

18Back to top Go down   brake issues Empty Re: brake issues Sat Jun 09, 2012 11:29 pm

K-BIKE

avatar
Life time member
Life time member
I know you checked the master cylinder but are all the small holes in the master cylinder free of blockage? One option is to suck the fluid up from the bottom cylinders (put a liberal coat of silicone grease around the bleed nipples so as to stop air being sucked in at that point) then using a modified master cylinder cover and suck with a Mityvac at the master cylinder so any air is encouraged to rise.

Before trying anything else have you followed the bleed process in the BMW manual to the letter? I ask this because different people have different ways of bleeding brakes.

Before you modify the standard setup almost everyone on the list has the standard setup and it works so there has to be a reason (other than demonic possession) why it is being so difficult to bleed.
Regards,
K-BIKE

    

19Back to top Go down   brake issues Empty Re: brake issues Mon Jun 11, 2012 8:35 am

wez1

wez1
active member
active member
thanks K-Bike i am going to try again to bleed them but first i need to get hold af a new callipeer as i broke the bleeding nipple on the lefthand one Embarassed

i will then try the way the manual says it should b done once i get hold of one. but initially i think the problem is the bridging line as i get good pressure when i connect the callipers directly to the brake line one by one so will keep my progress posted as it goes brake issues 178468

    

20Back to top Go down   brake issues Empty Re: brake issues Mon Jun 11, 2012 10:22 am

RicK G

RicK G
admin
admin
The K1100 has a T piece and seperate lines going to each caliper and was heaps easier to bleed and on the K100 when I got rid of the ABS I had the same setup and it was great, no problems at all.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

21Back to top Go down   brake issues Empty Re: brake issues Mon Jun 11, 2012 10:39 am

wez1

wez1
active member
active member
hi Rick been thinking about putting a T piece in an using two bleed nipple's wonder if it would effect the abs function though. it should'nt though but i'm not sure. it would make bleeding an easy thing though. cheers

    

22Back to top Go down   brake issues Empty Re: brake issues Mon Jun 11, 2012 9:26 pm

RicK G

RicK G
admin
admin
The early K11s have the same ABS with a T piece I dont see how it could affect it.
The two bleeders certainly make it easy.
My K75 has the crossover tube and it is a real PITA as was the K100.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

23Back to top Go down   brake issues Empty Re: brake issues Wed Jun 13, 2012 6:33 pm

wez1

wez1
active member
active member
i tried that today and been at it for hojurs trying different things lol

discovered something interesting that iam going to try called braided brake lines HA HA i have come to the comnclusion that although one brake has enough pressure wehn connected and the other side has enough pressure when connected but upon connecting both together and bleeding for hours and hours the pressure is still zero, i have to admit defeat. i am going to try graided hoses and then will get back with the results

going to sit down with a wee drambrake issues 292303 now and consider the fruitless day of fails

    

24Back to top Go down   brake issues Empty Re: brake issues Fri Jun 15, 2012 4:28 pm

wez1

wez1
active member
active member
yo hey got good newsbrake issues 723598 lol thanks t all the helpfull comments and the advice given i have re worked all the piping on the front brakes fitted a tpiece and braided hoses after plenty bleeding and a little cursing i now have front brakes brake issues 318212

but the hair in the soup is that i found that it was due to the anti squeel shim in the brakes that the brakes wer retracting to far and therfor the pressure or distance i had to pul the brake lever was < than could be compensated lol

now i have to tacle the ABS non function but can at last MOT the bike

once again thanks for the advice all of you were willing to part with and i apreceate it lots

i owe you a beer brake issues 502531 or two if we get the cahnce to meet

    

25Back to top Go down   brake issues Empty Re: brake issues Fri Jun 15, 2012 8:38 pm

RicK G

RicK G
admin
admin
Good news Wez if you get a password from Crazy Frog aka Bert you will get access to the downloads page and find how to reset the ABS computer which is probably all that is needed.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

26Back to top Go down   brake issues Empty Re: brake issues Sat Jun 16, 2012 1:08 pm

wez1

wez1
active member
active member
cheers will do when i get round to it bit of cash flow problem lol

    

27Back to top Go down   brake issues Empty Re: brake issues Sat Jun 16, 2012 1:54 pm

Inge K.

Inge K.
VIP
VIP
I think CF also accept credit cards. brake issues Laughi11


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

28Back to top Go down   brake issues Empty Re: brake issues Sat Jun 16, 2012 3:38 pm

wez1

wez1
active member
active member
yeah cool if you have one lolbrake issues 44271

    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum