Help! I must bleed my master cylinder
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This is a discussion on Help! I must bleed my master cylinder within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I do believe I messed up my bleeding session. I've gone back over it, and when bleeding at all corners, ...

  1. #1
    Registered User tiltrite's Avatar
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    Help! I must bleed my master cylinder

    I do believe I messed up my bleeding session. I've gone back over it, and when bleeding at all corners, no air bubbles show up, but I still have very spongy brake travel. Next I will bleed MC, as there may be air trapped in there.

    I've read the instructions, but I don't know which is the primary hose and which is the secondary hose of the MC; also it says to cover the outlet plug with a finger: which is the outlet plug?

    finally: "cover the master cylinder with vinyl bag"
    WTF? For cleanliness or some other reason?

    Any help is welcome. here are the instructions I'm reading from.

    1. MASTER CYLINDER
    NOTE:
    If the master cylinder is disassembled or reservoir tank is empty, bleed the master cylinder.
    During the bleeding operation, keep the brake reservoir tank filled with brake fluid to eliminate entry of air.
    Brake pedal operating must be very slow.
    For convenience and safety, two people should
    do the work.
    1) Disconnect the brake line at primary and sec-
    ondary sides.
    2) Cover the master cylinder with vinyl bag.
    3) Carefully depress and hold the brake pedal.
    S4M0.540
    4) Close the outlet plug with your finger, and re-
    lease the brake pedal.
    I S4M0541
    5) Repeat the above step3) and 4) until brake fluid
    is completey bled from outlet plug.
    6) Remove the vinyl bag, then connect the brake
    pipe to master cylinder.
    Tightening torque:
    7) Using water, wash off the spilt brake fluid at the
    master cylinder surrounding, then wipe up the wa-
    ter.
    8) Bleed air from the brake line. <Ref. to BR-46,
    BRAKE LINE, PROCEDURE, Air Bleeding.>
    Last edited by tiltrite; 03-28-2004 at 06:23 PM.

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  3. #2
    k91
    k91 is offline
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    Re: Help! I must bleed my master cylinder

    Originally posted by tiltrite
    finally: "cover the master cylinder with vinyl bag"
    WTF? For cleanliness or some other reason?
    Because brake fluid is pretty nasty to paint

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