BMW K bikes (Bricks)

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1Back to top Go down   K100 Front brakes Empty K100 Front brakes Thu Feb 14, 2013 1:38 pm

STEVE1959

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My 1985 K100 has had a very firm lever feel to the front brake since I purchased it just over a year ago. The lever does not travel very far before the brakes engage. It appears to have the original master cylinder fitted which has "13" cast into it and it has the original 2 piston calipers with "HEL" braided lines and Metalgear pads and rotors.. The brakes do not bind or drag but are "super powerful" with the least amount of pressure on the lever. I am used to it but a mate had a ride on it the other day and grabbed a handful of front brake and nearly had a nasty accident because of it. Does anybody have any idea ideas why they are so touchy?

    

2Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 3:16 pm

Comberjohn

Comberjohn
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Both my '84 RT and '89 LT both had a similar problem. Brake lever felt more like an on/off switch.
I found that taking the brake lever pivot bolt out, giving it a clean up and applying a little grease helped.
The pivot bolt can get dry or corroded and doesn't allow the lever to move smoothly.
Worth a try.

http://www.johnsdrivingschool.co
    

3Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 3:35 pm

JimK

JimK
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Steve,

Questions I would offer would be, is it linearly progressive..or grabs right now.?

Used to run jap sport bikes that were brake upgraded and they would put one on one's ear easily if not knowing that the brakes were that good. There was a fine touch for the brakes and they got used hard, and all that was fine after using them for a bit.



Last edited by JimK on Thu Feb 14, 2013 8:31 pm; edited 3 times in total (Reason for editing : seeking clarity)


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'89 k100 rs se
    

4Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 7:41 pm

STEVE1959

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Comberjohn, will try your suggestion and see if that makes a difference, sometimes it is easy to overlook the obvious. JimK it is hard to describe exactly what is going on but the lever doesn't have a lot of travel and you get very strong braking with the lightest touch of the lever. The brakes are that strong they make the brakes on my 2001 model Yamaha FZ1 seem puny. There may be a lot of power but not a lot of feel or progressiveness and for someone not used to them it could bring them down. Will go and grease the pivot now.

    

5Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 8:25 pm

JimK

JimK
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Obviously you are not a new guy to riding...and are uncomfortable with the brakes.
Copy that.
That ain't good.
Sure that others that know will shout out soon.
Good crowd here will certainly offer more thoughts.
I've ridden things that didn't stop well in the past.
Try to do that part better now...Smile


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'89 k100 rs se
    

6Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 9:13 pm

RicK G

RicK G
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One problem I had with the k75 was that where the lever touches the piston had become worn and uneven so that I would have to pull on the lever without result then it would go suddenly and grab. Might pay to have a look when the pivot is 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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

7Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 9:29 pm

STEVE1959

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Have just taken the lever out and it was dry in there, so have cleaned everything up and greased the pivot bolt which showed minimal wear. Also greased the bolt hole in the lever and put a small amount where it touches the end of the piston. The lever had no wear either in the hole or where it pushes on the piston. Haven't had a chance to take it out for a ride but will report back. It has the feel of a bike that has the wrong size master cylinder fitted, but it has 13 on it which I guess to be the bore size in mm on it which appears to be the correct size. Hopefully I should be able to take it out for a run tomorrow.

    

8Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 10:12 pm

Ajays

Ajays
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You are looking at the wrong end.
Try changing your pads, and clean up the calliper pistons.
The pistons are not withdrawing enough and therefore giving you an immediate grab.
Bin there dun that....!!


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K100 Front brakes Th_Kengine_gif

AJAYS
    

9Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 10:35 pm

rosskko

rosskko
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VIP
Just replace the fluid.
Then don't bleed it properly.
Soft spongy brakes.

Next question.


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1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ  05/1988

K1100RS 0194321
    

10Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 10:38 pm

the.postman

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Yeh ... and get rid of those braided hoses and put some nice 25yr old rubber ones on Very Happy


__________________________________________________
1985 K100 RS   104EA49840092        #0081788     SILVERish (Madison) Prod. date 05/12/84
1984 srx 600
1986 cbr1000f/h
    

11Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Thu Feb 14, 2013 11:51 pm

Comberjohn

Comberjohn
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The only other thing to check that no one has mentioned. Are either or both discs warped? I've had that on standard discs and it does make it grabby.

http://www.johnsdrivingschool.co
    

12Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Fri Feb 15, 2013 12:24 pm

STEVE1959

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Comberjohn, both the pads and discs were replaced with new ones just before I purchased the bike.

    

13Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Fri Feb 15, 2013 1:31 pm

gmcq

gmcq
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+1 with Ajays. Sound very like the pistons are not retracting.

GMcQ


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1996 K1100LTIC 0235790
    

14Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Sun Aug 30, 2015 11:02 pm

rawdonball

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Read this old post with interest :-
A) it is a classic example of Rossko humour (I read all his posts whatever the subject - almost always good entertainment value)
B) I had knotchy feel to front brake lever on K75 plus Mate reported grabbing. I took the opportunity to clean up caliper pistons and while bleeding realized that the problem was as per Ricks post - the area on the lever that bears against the piston rod wears such that the sliding that must take place as the contact point shifts, becomes uneven. Grease has minimized the problem but it will return and longer term fix will require original profile of contact surfaces to be re-established


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

15Back to top Go down   K100 Front brakes Empty there was a time Sun Aug 30, 2015 11:27 pm

Ajays

Ajays
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You may be interested.

My bikes

I have now bought a Piaggio MP3 TL so I am in the saddle on 3 wheels again much to the disgust     of the family. However, I shall continue to view the beloved forum and keep in touch.

PS; The wife is looking for a horse....!


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K100 Front brakes Th_Kengine_gif

AJAYS
    

16Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Mon Aug 31, 2015 2:14 am

92KK 84WW Olaf

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Excellent stuff, great to see you back on 'two' wheels. Good thing is they don't tow a horse box!!


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

17Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Mon Aug 31, 2015 4:16 am

rawdonball

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Liked the ideo clip - thanks AJAYS. 

WOUNDNT MIND A TEST RIDE ON ONE OF THOSE THREE WHEELERS!


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

18Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Mon Aug 31, 2015 6:08 am

RicK G

RicK G
admin
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Good on you Ajays. One of the founding members of the Ulysses Club (Over 40s motorcycle club) was asked what he said when his family was getting in his ear about giving up bikes. His imortal words of wisdon will always be with me "tell em to get stuffed". he was about 70 when that was said and he was riding for quite a few more years and he decided when the time had come.
K100 Front brakes 723598


__________________________________________________
"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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

19Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Tue Sep 01, 2015 12:26 am

Ajays

Ajays
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Piaggio MP3-400 LT

I thought you may like to see what an 87 year old  has to come down too...!


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K100 Front brakes Th_Kengine_gif

AJAYS
    

20Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Tue Sep 01, 2015 12:33 am

RicK G

RicK G
admin
admin
You are still riding that's the important bit and I figure that if you can at 87 then I have 20 years left at least.


__________________________________________________
"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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

21Back to top Go down   K100 Front brakes Empty Re: K100 Front brakes Tue Sep 01, 2015 2:52 am

Dai

Dai
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Me too. I see one of those parked near the office in Belfast.


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

22Back to top Go down   K100 Front brakes Empty remember those days? Tue Sep 08, 2015 3:45 am

Ajays

Ajays
Life time member
Life time member
I have been riding the trike MP3 TL around the villages here without a helmet [its legal] and it has brought back memories of the days with just the cap and googles holding it on. I used to turn my head those days to listen to the exhaust and finished up with blackheads in my ear that my sister used to get out.
I have my smile back but miss my K's
                                                         Cheers Ajays


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K100 Front brakes Th_Kengine_gif

AJAYS
    

23Back to top Go down   K100 Front brakes Empty K100 Front brakes Tue Sep 08, 2015 3:21 pm

RT

RT
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No helmet? gee whiz Ajays don't you want to get to old age?
It's nice to hear that you are enjoying the feeling of the ride still.
Good luck to you mate. (Sir mate I guess).


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2011 R1200RT
    

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