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Brake pedal sinks to floor?

Discussion in 'Tech Archive (No Posting)' started by psychofr_666, Jul 12, 2010.



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  1. psychofr_666

    psychofr_666 New Member

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    Jun 13, 2010
    Messages:
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    Location:
    ontario
    Hey everyone I just installed a Wilwood 6 piston front and 1 piston rear with parking brake kit and a new master cylinder in the car and i cant get the brake to hold its firmness... ive bleed the brakes 3 times bench bled the clutch and when i step on the brake pedal it goes to the floor and it sounds like you can hear air and spirting fluids... there is no leaks on any of the new brake lines all the bleeder valves are tightly closed and i have no idea what could be causing the problem... any suggestings would be great
     
  2. 98ej8

    98ej8 I LOVE MY GIRLFRIEND Registered VIP 5+ Year Member

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    could it be that your master cylinder isnt large enough?
     
  3. Platinumcloud

    Platinumcloud New Member

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    if it sounds like fluid is squirting then you still have air in the lines....you say that you have installed new lines...if they dont maintain "flow" your going to have air in them and its a mother $&%*#@ to get out... keep going till you get that pedal to get firm and go some more...breaks arnt something you want to mess with. also now that i think about it it may be the master cylinder...i know on some of the older chevys you had to prime them before you put them in. just an idea
     
  4. psychofr_666

    psychofr_666 New Member

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    so i potentially just have to keep bleeding it more? like the last time i did it air came out of only the front calipers and that was after installing the new master cylinder... basically what happens is when i push the pedal it is more firm then it was with my stock braking system but the pedal sinks to the floor still... and if i pump it 3 or 4 times it gets stiffer and holds some pressure until i release it and try again... also with my old braking system i had a line leak and ran the master dry... thats mainly why i replaced the master but could that have caused a problem with excessive air in the system?
     
  5. rob-

    rob- New Member

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    theres a hole somewhere look again
     
  6. psychofr_666

    psychofr_666 New Member

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    Location:
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    The resevior hasnt lost any fluid so i dont think theyre is a leak anywhere all the new brake lines have thread sealant on the fittings and have no fluid build up around them
     
  7. psychofr_666

    psychofr_666 New Member

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    ontario
    Is there anywhere else in the system that air could be getting trapped?
     
  8. 2NRSTV

    2NRSTV Team Exile/ADO Garage Registered VIP

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    Do you have ABS?

    Also, you might have a bad piston cup.
     
  9. ej8mike

    ej8mike New Member

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    pa
    yeah sounds like u didnt bleed the brakes enough or right
     
  10. psychofr_666

    psychofr_666 New Member

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    yes its got abs and what do you mean by a bad piston cup?
     
  11. Aaron.

    Aaron. New Member Registered VIP 5+ Year Member

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    sounds like you have a toyota...
     
  12. 98ej8

    98ej8 I LOVE MY GIRLFRIEND Registered VIP 5+ Year Member

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    :rotflmfao:
     
  13. 2NRSTV

    2NRSTV Team Exile/ADO Garage Registered VIP

    Joined:
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    On the end of the pistons in the brake master cylinder are rubber cups. When you press on the brakes the cups keep the seal (and pressure) for the pistons inside the master.
    If you are loosing pressure but not leaking into the brake booster (by the way, check your booster and check valve for signs of brake fluid) but not missing any brake fluid, it could be a secondary piston (the piston meant for your rear brakes) that is leaking past and going back into the reservoir.

    And, since you have ABS and you changed both the Master Cylinder and the Calipers, you may need to have the ABS Modulator bled too. Ask a local brakes shop if you would need it bled.
     


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