504 Brake Problems.
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  1. #1
    Tadpole alex504's Avatar
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    Jul 2004
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    Canberra
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    Default 504 Brake Problems.

    Gday.

    My 504 brakes have been behaving strangely recently. When i apply the brakes the pedal bottoms out before full braking power is found, however if i pump the pedal just before applying them it is fine. Any ideas why this may be happening?

    Thanks,

    Alex.

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  2. #2
    Fellow Frogger! 20FIVE's Avatar
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    Jun 2004
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    Houston Texas
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    Quote Originally Posted by alex504
    Gday.

    My 504 brakes have been behaving strangely recently. When i apply the brakes the pedal bottoms out before full braking power is found, however if i pump the pedal just before applying them it is fine. Any ideas why this may be happening?

    Thanks,

    Alex.
    Potentially need to bleed brakes again, or need to overhaul/replace the mastercylinder as rubber cups are leaking... check for brake fluid inside under the dash where the brake pedal rod goes through the bulk head/fire wall.

  3. #3
    1000+ Posts edgedweller's Avatar
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    CLARE SA
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    Alex,

    you will need to check brake fluid level, if it is low and dropping over time you have a leak in the hydrolic system (fluid that transmits braking activity from foot to wheels).

    This could be, as Alex says, at the master cylinder, immediately under the brake fluid resevoir and result in fluid leak inside the cabin behind brake pedal lever, into carpet unfotunately.

    Otherwise and more likely a seal is gone in one or more of the brake calipers, that close onto the disc rotor to produce braking, evidence of this will be a dark, oily like coating on the inside of rim and tyre, very bitter tasting.

    Solution to both these problems is to "rekit" master cylinder or caliper/s.

    m c or caliper to be removed from car/disassemble/refit new rubbers/reassemble/refit to car/ top up and rebleed brake fluid/test.

    If any or all of this is beyond your mechanical ability consult very competent friend/acquaintance or brake professional, brakes being very important to personnal wellbeing.

    This problem that you have with the brakes is, of course, your immediate first priority in regard to transport, do not put off fixing or do not pass go, do not collect $200, go directly to hospital.

    good fortune

    ed ge

  4. #4
    Gone Fishin' Ray Bell's Avatar
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    Default

    I assume it's a 504 sedan?

    Two different scenarios for wagons and sedans...

    Sedan: Check for a leaking balance valve (look for a spring and rod acting on it from the rear sway bar), as well as leaking calipers. What is probably happening is the pump-up is replacing the leaked fluid, it's probably in the rear system, so you get pedal with the second application. It will probably be spongy if this is the case.

    Wagon: Most likely brake shoe wear. Pull the handbrake partially on and see if that improves things. If so, adjust rear shoes, it most likely isn't a leak at all.

    Then there's the difference in scenarios if it's a pre-76 model and has a single master cylinder and system...

    Probably a good idea to give more detail when you ask for help, you'll get more accurate answers sooner.

  5. #5
    Gone Fishin' Ray Bell's Avatar
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    Oh yeah... let us know if it's been using brake fluid, if the fluid's low or if you've always had to top up the fluid.

    And it should not be forgotten that a leaking clutch system will also affect the fluid level in the brake reservoir.

  6. #6
    Tadpole
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    Apr 2005
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    Auckland /NewZealand
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    Quote Originally Posted by alex504
    Gday.

    My 504 brakes have been behaving strangely recently. When i apply the brakes the pedal bottoms out before full braking power is found, however if i pump the pedal just before applying them it is fine. Any ideas why this may be happening?

    Thanks,

    Alex.
    My TI had the same problem,but over night i had no brakes .The master cylinder neaded to be re kitted its good now.

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