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899 Brake Locked On Again

Discussion in 'Panigale' started by Gabagool, May 15, 2022.

  1. Hi mate

    matter fuether inspection of the cables it didn’t melt any this time. I think it melted the abs cable before as far as my recollection goes.

    ok that makes sense, I’m sure he used dot 4 before. But he has replaced it with dot 5.1 now?

    With the adjustment of the lever is that something that is simple to do? it may be I do that for piece of mind anyway.

    I value the information you listed above so thank you for that!
     
  2. Yes simple, just a couple of small spanner’s adjusting right next to the pedal. Have a look on YouTube, must be something on there. You will have more travel on the pedal.

    How long since you bled the brake?
     
  3. I agree with Sam. Either you don’t have enough play at the lever (you should be able to feel the plunger pin touch the piston in the MC as you start to press the pedal), or the pressure relief channel in the cylinder is blocked. If you want to start changing parts start with the MC, not the caliper.
     
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  4. Great thanks bud
     
  5. Last year mate. I try do it yearly
     


  6. upload_2022-5-19_8-25-50.png

    The important thing is to check for some free play in the lever
    . The lever should move 5%–10% of its range of motion before feeling resistance at the lever. During this range of motion you should see a squirt of fluid into the reservoir. No squirt — either the vent port is plugged or there is no free play.

    As the brakes are applied the piston moves forward with the lip of the seal covering the vent port. Before this port is covered, piston motion forces excess fluid back into the reservoir. So, if you look into a reservoir just as the piston begins to move you will see slight fluid motion. Once the vent port is covered, fluid trapped in the hydraulic system cannot escape. Beyond this position the piston moves fluid to apply the brakes.

    If the piston is positioned incorrectly such that the vent port is covered and there is no free play at the lever, when the brake fluid heats up and expands during normal operation, the fluid cannot compensate for the increased volume by returning back to the reservoir, and instead, pushes the caliper pistons and actuates the brakes — locking them up, perhaps inconveniently and unsafely.

    Once the fluid cools and contracts, the caliper pistons can then retract and the brakes are released (until next time).
     
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  7. Thanks for this info I will keep reading through it so I can understand!
    Thanks!
     
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