binding lhs front brake caliper
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  • 1 Post By TheDuck

Thread: binding lhs front brake caliper

  1. #1

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    binding lhs front brake caliper

    Hi Guys
    now the bike is actually alive im working or it being able to stop
    the it appears that the front lhs caliper is binding ( dont think its the rhs as when i prise the rhs pads apart the turning resistance is not diminished
    so what have i done so far
    removed front calipers and cleaned the pins and with silicone grease to let them slide correctly
    wiggled the pistons in and out several times with silicone oil to lube the pistons sliding against the seals
    they are fairly free
    then bled the brakes
    front right first both nipples
    front left second both nipples
    rear last both nipples
    no issues to get clean fluid coming out
    but....
    being that this is linked system and having stood for several years ...
    when doing the front middle nipple by pressing the foot pedal ( rear ) at first nothing happened
    so i pressed progressively harder and harder and then a kind of pop happened and fluid came out and i continued flushing
    now i think i have read that there is a proportioning valve and the secondary pressure piston on the ft lhs side caliper
    i have also read that due to mis/ no use this can get bunged up
    so my question is
    do you think that i have a partial blockage on the fluid return and where could that be????
    look forward to being enlightened
    paul

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  3. #2

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    Re: binding lhs front brake caliper

    hi Guys
    looking around it seems that one cause may be a sticking delay/ proportioning valve
    any bets on that?
    cheers
    paul

  4. #3
    Supercharged Mod
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    Re: binding lhs front brake caliper

    Quote Originally Posted by cbrpaul View Post
    ... looking around it seems that one cause may be a sticking delay/ proportioning valve
    ......
    paul
    Could be and you can test for this. Push all 3 front pistons in. Use the front brake lever to push the 2 outer pistons out and see if the brake is binding. Push the 2 outer pistons in. Disconnect the secondary cylinder from the fork and at the bottom of the push rod. Pump the secondary cylinder push rod a few times and this time only the centre piston should move. Check if the front brake is binding.

    By checking this way you are (or should be!) separating the two systems and you can find out which one is causing the problem.
    Punts likes this.
    Full of Hot air? Intercool yourself............ you know it makes sense

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  6. #4

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    Re: binding lhs front brake caliper

    cbr
    The other issue could also be hard seals. The design of the caliper relies on the square seal to create enough stiction to roll slightly. The seals flexing back to its original shape is what actually partially retracts the piston back. If the seal has hardened it can let the piston slip instead of rocking and not pull the piston back.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.


 

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