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Thread: Front brake lever too loose

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  1. #1
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    Front brake lever too loose

    Front brake works fine in the sense that it stops the bike but I like the lever to be tighter and no require so much movement to stop the bike. Right now it's so loose the lever is touching the grip in order to stop the bike. Anyway to just make it stiffer?

    Bike is a 1988 R100rs mono shock

    A second question I had is about the ridiculous stock side stand....any solutions for a 1988 r100rs mono shock. I would like a robust side stand.

  2. #2
    . AntonLargiader's Avatar
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    Could be a few things, but the lever should firm up before it hits the grip.

    • You could have a stuck piston, which adds some elasticity to the system. Easy enough to check; remove the calipers and try to fully spread the pads. Then reinstall and see if all four of them pump back out.
    • Pads could be old. Especially if they have sat for a while without use; they absorb moisture and become spongey. Usually they will drag a lot when that happens, but they could get soft.
    • And of course you could have some air in the hydraulic lines.


    If all of that is OK, you might just have some lever wear or something that is causing the system to pump up later in the lever travel. When you squeeze the lever, pressure does not try to build until the piston crosses the equalization port in the MC bore. Then the pads start to move until they are against the rotor, then the stretch is taken out of the hoses and other parts, THEN you get real braking pressure. If you have too much lever travel before the braking pressure builds, it would be coming from one of these. The three items I started off with are all 'stretch' items.
    Anton Largiader 72724
    largiader.com bmwra.org

  3. #3
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    Could also be the brake line(s) allowing you to put enough pressure to "force" the brake to work, but it doesn't have enough "return" pressure. My brake line was almost totally clogged when I purchased the bike, and allowed some braking, but eventually didn't. So I replaced and then also rebuilt the master cylinder under the tank.

    Did the trick and stopped a slight leak I had from the cylinder.

  4. #4
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    Quote Originally Posted by jimmylee View Post
    Could also be the brake line(s) allowing you to put enough pressure to "force" the brake to work, but it doesn't have enough "return" pressure. My brake line was almost totally clogged when I purchased the bike, and allowed some braking, but eventually didn't. So I replaced and then also rebuilt the master cylinder under the tank.

    Did the trick and stopped a slight leak I had from the cylinder.
    You must have replaced the lines with some "high performance" brake lines.....where did you get these???

  5. #5
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    Quote Originally Posted by EMSimon View Post
    You must have replaced the lines with some "high performance" brake lines.....where did you get these???
    I have a friend who actually helped me out.

    I noticed that after installing his brake line, my bike actually ran faster!!

  6. #6
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    Quote Originally Posted by EMSimon View Post
    You must have replaced the lines with some "high performance" brake lines.....where did you get these???
    I can't divulge my friend's name or he would be swamped with people imposing on him.

    I think he is a little "screwy," but he does have good parts!

  7. #7
    Registered User krpntr's Avatar
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    I had that, or a similar problem. The nylon bushing for the brake lever pivot was worn through allowing too much slop in the stop. Changed the bushing and all parts tightened up.

  8. #8
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    Quote Originally Posted by jimmylee View Post
    I can't divulge my friend's name or he would be swamped with people imposing on him.

    I think he is a little "screwy," but he does have good parts!
    I know a guy like this. They are a pita, but you have to put up with them. Never know if you need them down the road.....

  9. #9
    James.A
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    I own the same year/model bike. With regard to the side-stand, you could retrain yourself to use it as is. I have adapted to the practice of using my heel to deploy the stand while seated on the bike and then lean the bike over onto the stand while holding it out. Before doing this, I shut down the motor and leave the bike in first gear, clutched out, to prevent a roll away.

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