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Old 03-11-2013, 11:30 PM   #1
peterman OP
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Joined: Jan 2006
Location: Springfield,,,,like the Simpsons,,,orygun
Oddometer: 13,347
R100GS,rear brake

Is there a mod or tech improvement to help the really crappy rear braking?
I can nearly stand my full weight on the brake pedal and still not skid/lock up the tire on a gravel road. What can be done,,anything? HELP! I can't stop!
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Old 03-11-2013, 11:41 PM   #2
SOLO LOBO
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I'd start by cleaning and greasing all the moving parts from the pedal back, and consider replacing the cable as well

That, along with some light sanding of the pads allowed me to lock the rear brake on my old GS with medium pressure
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Old 03-12-2013, 12:20 AM   #3
Box'a'bits
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Here's a thread with a prior discussion on this. I struggled with the same issue. The solution for me was new shoes, cleaning & lubing everything, including making sure the cables were good, & then modifying the rear brake pedal pull on the cable to improve the leverage.

There were 2 generations of GS brakes - 88-90, & 90 onwards. Mine is a '91 R100GS.
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Old 03-13-2013, 09:09 AM   #4
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What's the generational difference?
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Old 03-13-2013, 08:27 PM   #5
peterman OP
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re-line the lining,,

I went to a local friction type business to ask about re-lining the BMW rear shoes with something grabbier!
Yep,,no problem,,"we charge a $75 set-up fee, plus the actual cost of the job" , the re-line itself is less than the set-up charge,(which would be cheaper if you had 100 sets of brake shoes.)

I passed on that plan,,there is another shop in the area that may have different pricing,,I am looking,,,
I can still have good time hooligan fun skidding my back tire in the alleys on the trusty KLR!
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Old 03-13-2013, 08:50 PM   #6
peterman OP
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re-line the lining,,

I went to a local friction type business to ask about re-ling the BMW rear shoes with something grabbier!
Yep,,no problem,,"we charge a $75 set-up fee, plus the actual cost of the job" , the re-line itself is less than the set-up charge,(which would be cheaper if you had 100 sets of brake shoes.)

I passed on that plan,,there is another shop in the area that may have different pricing,,I am looking,,,
I can still have good time hooligan fun skidding my back tire in the alleys on the trusty KLR!
sorry,failed to state, my bike is a 1992.
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Old 03-13-2013, 09:47 PM   #7
peterman OP
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can't afford to really love,

give it what any bike needs,, good suspension and brakes,,etc,.

I think I may just sell the bike,,as opposed to re-vamping real brakes, and real front suspension,, at this point, without spending money that I don't have, the KLR may work better for me. I like the GS,,I just don't love it. can't afford the upgrades I'd consider needed ,,to buy trustworthy-ness and common parts access.
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Old 03-23-2013, 03:29 PM   #8
Havingfun
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Wingnut

It may be as simple as adjusting the wingnut to tighten the cable. I'm sure you've already tried that but didn't see where anyone mentioned it.
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Old 03-23-2013, 07:07 PM   #9
One Less Harley
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I had my G/S shoes relined. I can check the exact price but it was about $55, about the price of EBC shoes. In the USA, Indianna.

http://brakematerialsandparts.webs.com/
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Old 04-02-2013, 08:59 AM   #10
homere
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r100gs rear brake springs rubbing inside

Did I do something wrong? Put in new rear shoes on a 1993 r100gs, bmw parts, and the springs rub inside the hub, I put the spring on the outside of the shoes ( like manual told) ? HELP
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Old 04-02-2013, 09:24 AM   #11
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Quote:
Originally Posted by peterman View Post
Is there a mod or tech improvement to help the really crappy rear braking?
I can nearly stand my full weight on the brake pedal and still not skid/lock up the tire on a gravel road. What can be done,,anything? HELP! I can't stop!
I've always considered it to be a really cheap form of ABS. A lot of guys pay big bucks to get this feature on newer bikes.
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Old 04-02-2013, 09:30 AM   #12
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Quote:
Originally Posted by homere View Post
Did I do something wrong? Put in new rear shoes on a 1993 r100gs, bmw parts, and the springs rub inside the hub, I put the spring on the outside of the shoes ( like manual told) ? HELP
This was many years ago so the details are hazy. I broke a spring and ordered new ones from Engles in KC. When I installed one it rubbed. The springs looked the same to me I think. I do remember that no amount of fiddling could correct the problem. I called Engle's and they said let them look into it. They called me back and said the springs were not identical, but had the same part number! They sent me a new spring and it worked fine.

Like I said it was several years ago so FWIW. I do know I had the same problem and it had something to do with a part number problem and different springs. Good luck.
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Old 04-02-2013, 09:44 AM   #13
KhaoSanMan
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You could go with a disc if you get some parts off a K100 rear-end and have the FD's shimmed to match.
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Old 04-02-2013, 09:47 AM   #14
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Still. What's the difference between 88-90 and the later back brakes?
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Old 04-02-2013, 12:49 PM   #15
Box'a'bits
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Quote:
Originally Posted by camgregus View Post
Still. What's the difference between 88-90 and the later back brakes?
Come on guys, you could have found this info for yourselves.
  • Here's the 88-Sept 89 fiche Shoes part no 34 21 2 310 474, brake cam 35 21 1 458 118 &
  • Here's the 09/89 - onwards Shoes part no 34 21 2 311 019, brake cam 35 21 2 310 897.
I don't have both bikes (only a '91), but from what I can gather the 09/89 onward shoes have a far flatter surface for the flatter (later) cam to work upon.

Don't know if a retrofit would work, nor if that would result in better brakes. I suspect not.
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