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1Back to top Go down   brake discs... stupid me (i guess) Empty brake discs... stupid me (i guess) Mon Nov 07, 2011 8:03 am

pajonk

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hey all,

so i bought a "new" disc brake, the seller said it's 4mm thick so i thought - well, not bad, especially when mine is as thin as a potato chip.

i paid the guy and waited for the package to arrive. i got it today and... the disc brake has a pretty serious rand (not as bad as in mine but it's there) and i would say it's less than 4mm below the rand...

my question is - is it still a good idea to use it? or when a disc has that rand, it's usless (i would think so).

i will be thankful for any suggestions
cheers
Pajonk

    

blaKey

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Well, I'm going to ask the obvious...rand? The "ridge" on the edge of the disc?

The service limit for the disc is 3.556mm. Do you have some calipers to measure the thickness?


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

zonenfeile

zonenfeile
Gold member
Gold member
hi,
i will never understand why all over the world the same mistakes are made over an over again.

if you´ve got trouble with the breakesystems (totaly normal after 25 ears):

1. No used parts
2. new lines - rear an front
3. open the main cylinder , cleaning and remounting with ATE paste - or new cylinder from Magura (mostly 13mm)
4. open and clean the break calliper - awfull juice in there (new set of gaskets: 34112310493 )
5. disks: changing the breaking ring - or complete disk

only the addition of all mentioned points will make it.

but as always :
work on the breaksystem has to be done by someone who knows what he´s doing


__________________________________________________
ex K1100/2

K- Wiki - or rtfm first

Regards from Hamburg

Olaf
    

pajonk

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mistakes meaning - do not buy used parts? Wink

i know but come on - a new brake disc for this bike costs a fortune!

    

zonenfeile

zonenfeile
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@pajonk wrote:mistakes meaning - do not buy used parts? Wink

i know but come on - a new brake disc for this bike costs a fortune!

1: you need 2 brake discs... stupid me (i guess) 719641

2: you don´t have to go to BMW

3: have you had contact with :

for Germany Rolf Ludwig
netherlands: http://www.hobbyist.nl/

both know what you need

    

pajonk

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it's for the rear wheel Wink so i need only one hehe

of course i do not have to go to BMW, more, i don't want to. but still, they are damn expensive (as for me). i paid 50 Euro for this one but the seller said it's 4mm thick, but it's not...

    

Guest

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Pajonk, try www.motobins.co.uk for another source of new brake parts. They sell Grimeca pattern rear discs for £77 and original equipment which might not break your bank.

    

Crazy Frog

Crazy Frog
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I agree with zonenfeile about the procedure for maintaining the brakes, but I disagree about avoiding used parts.
Considering the cost of BMW parts sold outside the EU, this is out of reach for a lot of us.
2 weeks ago, I replaced my rear disk with a K1100 disk.
The disk was under the minimal thickness for a K1100, but way over the limit for a K100. The disk was slightly grooved and had a ridge on the outer part.
Here is how I proceeded:
I first filed down the ridge slightly at angle to be sure that it would not interfere with the braking surface.
I removed the ABS ring (no need of it on a 85 K100rt) and installed the disk on the bike. I check with an indicator to confirm that it was running true (not warped).
I installed a new set of break pad, took a permanent maker and wrote all over the disk. I then started the bike, put it in gear then applied the brake to see the surface of contact between the pads and the disk.
It was looking very good at the exception of the grooves.
Here is how a corrected the surface:
I remove the caliper, took a new oil stone like this one,
brake discs... stupid me (i guess) CombiIndia
put the bike in first gear and started to grind the disk (by applying an even pressure on the stone) until the surface was almost flat (near perfect).
I then cleaned the disk to be sure that no grits remained on it (Very important), cleaned it with gas, measured the thickness a different areas and re-installed the caliper.
It works like a brand new brake and I am ready to use it for another 100K.
The total time for the operation was about 3 hours, and the cost was $30.

Not bad in comparison of the cost of a new disk.

Yeah, I know I am cheap, but it works for me.



__________________________________________________
brake discs... stupid me (i guess) Frog15brake discs... stupid me (i guess) Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

88

88
Life time member
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Super idea CF. It would never have occurred to me to use an 1100 disc!


__________________________________________________
brake discs... stupid me (i guess) Ir-log11 88....May contain nuts!brake discs... stupid me (i guess) 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)
    

10Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 07, 2011 6:27 pm

Guest

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Guest
A similar story for me recently using secondhand parts. Needing to use the bike almost every day, and having a slightly binding rear caliper which was going to toast my rear brake disc eventually, I procured a clean, low-mileage K1100 caliper on eBay for under $30 posted to my house. I removed the ABS stub (no need for that on a 1987 K100RS) and after a thorough clean up with brake parts cleaner and elbow grease (I never run out of a tub of that) I fitted the caliper with new EBC pads and a Venhill braided hose and gave it a good bleed. The brakes now work como Dios manda (as intended). That was five thousand Kms ago. Now when the bike is idling on the centre stand the rear wheel turns slowly where as before it was stopped and would only spin if forced (even after I gave it a good bleed and clean out). Imagine what that would do to brake pads and the disc over a short period of time. I'm a cheapskate too and the total cost was under a hunnerd Aussie Shekels. Another good bit is that over time I will procure a seal kit and rebuild my old caliper as a spare for the next millennium.

    

11Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 07, 2011 7:06 pm

Crazy Frog

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@Two Wheels Better wrote: I'm a cheapskate too and the total cost was under a hunnerd Aussie Shekels.
Hey we are not cheap, but full of resources. lol!


__________________________________________________
brake discs... stupid me (i guess) Frog15brake discs... stupid me (i guess) Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

12Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 07, 2011 9:00 pm

Guest

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Which we are willing to share, like beer and beans (or the aroma of them). Sad

    

13Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 07, 2011 9:04 pm

Crazy Frog

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@Two Wheels Better wrote:Which we are willing to share, like beer and beans (or the aroma of them). Sad

If we ever ride together, please stay on the back of me.
It was the big joke when we stopped for lunch as I ordered a big bowl of chili! The exhaust was quit rich with some back fire after the meal. I blamed it on an unset throttle switch. lol!



Last edited by Crazy Frog on Mon Nov 07, 2011 9:13 pm; edited 1 time in total


__________________________________________________
brake discs... stupid me (i guess) Frog15brake discs... stupid me (i guess) Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

14Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 07, 2011 9:08 pm

Guest

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OK, you can show me the way round your neighbourhood, but NOT if you've ordered chili! 🐷

    

15Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Wed Nov 09, 2011 4:47 am

pajonk

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well, that is all true - if i could afford it all, i would buy a new one but motobins has only non-ABS discs...

about the one i got - i guess i just lost a bit of money. on the other hand though i am a bit confused - it looks like the new disc was 5mm thick. on the disc itself it says - min 0.18" (4,5mm) whereas in the Haynes book it's said that a new disc has 4,4mm and the min thickness is 0.14" (3,5mm). who should i believe? Wink

    

16Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Wed Nov 09, 2011 5:12 am

zonenfeile

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@pajonk wrote:well, that is all true - if i could afford it all, i would buy a new one but motobins has only non-ABS discs...

about the one i got - i guess i just lost a bit of money. on the other hand though i am a bit confused - it looks like the new disc was 5mm thick. on the disc itself it says - min 0.18" (4,5mm) whereas in the Haynes book it's said that a new disc has 4,4mm and the min thickness is 0.14" (3,5mm). who should i believe? Wink

it depends from what bike the disks came from

ABS Bikes have different thickness than non ABS

Using "worn" ABS Disk as "almost new" in non ABS Bikes is very common

brake discs... stupid me (i guess) %3Ctable%20style=brake discs... stupid me (i guess) 34%252520Bremse%252520ohne%252520ABS

brake discs... stupid me (i guess) %3Ctable%20style=brake discs... stupid me (i guess) 34%252520Bremse%252520mit%252520ABS

    

17Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Wed Nov 09, 2011 5:38 am

pajonk

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sweet, that means i bought a piece of crap for 50 euro... Razz

    

18Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Wed Nov 09, 2011 5:48 am

zonenfeile

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@pajonk wrote:sweet, that means i bought a piece of crap for 50 euro... Razz

you did it by your own choice brake discs... stupid me (i guess) 8157

Rtfm first.....

brake discs... stupid me (i guess) 78846

Again :
Call the guys in Holland (English & German spoken) they know exactly what you need

http://www.hobbyist.nl/contact.php/

    

19Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Thu Nov 10, 2011 5:44 am

pajonk

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but believe me - my disc brake is probably less than 3mm now... so i guess i will survive until i am rich again Wink

    

20Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Thu Nov 10, 2011 3:36 pm

club_c

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Any recourse with the seller pajonk?


__________________________________________________
"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

21Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Nov 14, 2011 4:43 am

pajonk

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nope... the guy never replied to my emails... so meh, screw him, but thanks for asking Wink

    

22Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Sun Feb 19, 2012 5:06 pm

RT

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Sorry to reopen this can of worms but can anyone tell me if the two alloy (brass coloured) screws holding the disc to the final drive body are re useable, they seemed very soft when I undid them (at the hex
drive)
RT

    

23Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Sun Feb 19, 2012 5:12 pm

Inge K.

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Those screws is a one time use.

Inge K.


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

24Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Sun Feb 19, 2012 9:02 pm

Oldgoat

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Whoa, missed that one on my FD service. Thanks for the safety tip Inge!!

OG

    

25Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Sun Feb 19, 2012 9:41 pm

RT

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Thanks Inge, you are certainly a mine of information.
Keep warm
RT

    

26Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 3:41 am

Two Wheels Better

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I've just received my new Grimeca rear brake disc from Motobins and have two new tapered screws for it. They can be got from any nut and bolt source in stainless but the OEM screws from usually priced-outta-this-world BMW Australia is actually cheap at cents, not dollars (the BMW distributor sets the suggested price, boys, not the conscientous dealers - though plenty of unscrupulous dealers do add the extra margin. My advice is to let them know you're onto them and avoid them). Some new Ferodo pads back there, a good flush of the not-too old brake fluid of the recent replacement second hand K1100 caliper and we'll be laughing.


__________________________________________________

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
    

27Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 3:54 am

charlie99

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nice one gith .....better order me a couple for the brake refurbish in a few weeks

good to receive parcels in the mail


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Obrake discs... stupid me (i guess) 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 ..
    

28Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 4:01 am

Two Wheels Better

Two Wheels Better
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Brown paper packages tied up with string. These are a few of my favourite things. Julie Andrews was hot once upon a time.


__________________________________________________

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
    

29Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 4:31 am

charlie99

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brake discs... stupid me (i guess) 112350 brake discs... stupid me (i guess) 44271


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Obrake discs... stupid me (i guess) 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 ..
    

30Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 5:12 am

BEEJAY

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Guest wrote:Pajonk, try www.motobins.co.uk for another source of new brake parts. They sell Grimeca pattern rear discs for £77 and original equipment which might not break your bank.

The motobins price does not include the dreaded VAT, which makes them £92.40, which is the same price as James Sherlock for Grimeca.
James Sherlock are currently testing a cheaper range of disks and they are going to let me know the results. Don't know the final price yet, but they will be on a service exchange.

Bryan

    

31Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 5:37 am

charlie99

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but us foreigners dont pay the dredded " various added taxes " so its all good from down under, and strange ports of call


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Obrake discs... stupid me (i guess) 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 ..
    

32Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 6:36 am

Two Wheels Better

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AU$150 from the boys at the 'Bins to my doorstep for a disc brake (locally of varied sources and dubious quality) that would otherwise cfost a minimum of $229 here.



Last edited by Guest in the House on Mon Feb 20, 2012 3:05 pm; edited 1 time in total


__________________________________________________

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
    

33Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 2:07 pm

sidecar paul

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@Inge K. wrote:Those screws is a one time use.

Inge K.
Why? They only hold the disc in place during assembly, surely the four wheel bolts clamp the disc in place.
Paul.

    

34Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 3:01 pm

Two Wheels Better

Two Wheels Better
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They are soft and easily damaged. BMW recommend them to be replaced after each use, like many fasteners on the various models. But we do still have free will and can smoke our cigarette right down to the filter, hell, we can roll our own!


__________________________________________________

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
    

35Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 5:23 pm

walfish

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Agree with you Paul - these are only there to assist during assembly, my K only has 1.

    

36Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 5:49 pm

RT

RT
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Being ham fisted I ended up damaging the hex head getting them undone, I don't think I want to be trying that again in 27 years time.
brake discs... stupid me (i guess) 214585

    

37Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 6:00 pm

sidecar paul

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RT,
Nowadays I only tighten mine a little more than fingertight, to save destroying the hexagon.
Paul


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

38Back to top Go down   brake discs... stupid me (i guess) Empty Re: brake discs... stupid me (i guess) Mon Feb 20, 2012 7:02 pm

RicK G

RicK G
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I use stainless screws and antisieze done up just firm after all the wheel prevents the things comming 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
    

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