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Thread: Brake pedal goes to the floor

  1. #1

    Default Brake pedal goes to the floor

    I finally got my '60 Series II 88 running only to find the brake pedal goes straight to the floor. Brake fluid level is fine. New master cylinder 2 years ago. Any suggestions on how to troubleshoot? For what it's worth, the clutch works fine.

    Many thanks!
    David
    ___________________
    Dave (roversii)
    1960 Series II - "Angus"

  2. #2
    Join Date
    Oct 2006
    Location
    North MS
    Posts
    977

    Default

    If the fluid level is not going down, most likely the MC has blown an internal seal, and will need to be replaced. However, look up under the pedal (from the floorboard) to make sure that the linkage is actually moving the rod in and out of the MC.
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    66 IIA 109" Pickup (Restomod, 5MGE, R380)
    67 IIA 109" NADA Wagon (sold)
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  3. #3
    Join Date
    Sep 2010
    Location
    killingworth CT
    Posts
    836

    Default

    check mechanical linkage first, is pedal moving plunger at MC? if so sounds like JP might have the next step, best of luck,

  4. #4

    Default

    Quote Originally Posted by jp- View Post
    If the fluid level is not going down, most likely the MC has blown an internal seal, and will need to be replaced. However, look up under the pedal (from the floorboard) to make sure that the linkage is actually moving the rod in and out of the MC.
    The pedal linkage may be moving the rod in and out of the MC, but if the MC innards are jammed forward for some reason it'll just flop that rod back and forth without moving any fluid. See https://www.roversnorth.com/parts/pl...inder_early_cv for picture of an MC with a rod that's not directly connected to the MC piston's plunger, only pushes on it. Suspect you'll have to take the MC off and apart to get things moving again, put in new seals and flush the system to get pressure back.

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