02 deville soft brake pedal
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 02 deville soft brake pedal in Past Cadillac Vehicle Discussion; 02 deville soft brake pedal ive replaced the booster and master cylinder and the brake pedal is still very soft ...
  1. #1
    kasrx7000 is offline Cadillac Owners Member
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    02 deville soft brake pedal

    02 deville soft brake pedal ive replaced the booster and master cylinder and the brake pedal is still very soft and there is no leaks any help would be appreciated

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    :welcome

    A failed booster will cause a hard pedal, and greatly increase the pedal effort required to stop.

    A failed master cylinder will cause a sinking pedal, or no brakes.

    How worn are the pads.
    Was the system bled properly?

  4. #3
    kasrx7000 is offline Cadillac Owners Member
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    Re: 02 deville soft brake pedal

    i beleive i bled them properly and the pads are like new

    ----------

    the car stops fine just doesnt give you the secure feeling with the soft pedal

  5. #4
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
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    Re: 02 deville soft brake pedal

    What MC has said. Sounds like the MC wasn't bench bled properly or even wrong/bad unit.
    Are these these same symptoms you had before replacing MC and booster?

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 02 deville soft brake pedal

    If you can pump up the pedal and it doesn't sink, you have air in the system. Simple as that.

  7. #6
    kasrx7000 is offline Cadillac Owners Member
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    Re: 02 deville soft brake pedal

    pedal is firm till it is started

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by rodnok01
    Are these these same symptoms you had before replacing MC and booster?
    ^^This^^, how long have you owned the car, and how long has the pedal been soft?

  9. #8
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 02 deville soft brake pedal

    there are only a few thing that can cause a spongy - or soft pedal -
    the most common - especially after replacing the master cylinder -
    is that the master cylinder was NOT properly BENCH BLED -
    this results in air trapped in the master cylinder that can not be bled out -

    the ONLY way to release this trapped air
    is to remove the master and bench-bleed it -

  10. #9
    Manic Mechanic is offline Cadillac Owners Fanatic
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    Re: 02 deville soft brake pedal

    The only other way is to pull a vacuum on the master cylinder reservoir, and it's much faster and easier once you're set up for it. I collect the caps off old MC's and sometimes order a new one then drill and tap it for a small brass nipple. Then I use my hand vacuum pump to solve some of the most difficult trapped air problems in brake and clutch fluid systems. Same for power steering. Pull 15-20" Hg for a minute pumping the pedal a few times then remove it and afterwards you'll never feel a firmer pedal. Pulling a vacuum on the system with fluid available to fill the void is how brakes are filled and bled on vehicle assembly lines also. If you don't have a hand vacuum pump you can use intake manifold vacuum on a running engine, you just have to be careful to not have the reservoir so full that it pulls fluid into the engine. Don't try this without a long clear hose to keep it in check. An engine will pull all of the caliper pistons in in no time and the fluid comes back to the reservoir, leave room for it.

    The ABS needs a scan-tool to activate the valve block bleed procedure to remove any air trapped there.

    If you've done everything to remove any trapped air and it's still soft then your ABS unit probably has internal faults and is by-passing. You can't repair them you have to replace them.

    Vernon

  11. #10
    carnut is offline Cadillac Owners Master
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    Re: 02 deville soft brake pedal

    A shot in the dark!!! If this car has rear disc brakes and you dont use the parking brake, the rear caliper pistons will seize and you will have a soft pedal. Too much distance from the rear pad surface to the rotor IE "soft pedal" With your left foot holding the parking brake down and your right foot on the brake pedal, lift your right foot. If the car moves forward, the rear brakes are not working effectively. Sometimes you can get lucky and adjust the parking brake by the book, most times though the calipers need replaced because the ratcheting pistons have siezed from lack of use.

  12. #11
    kasrx7000 is offline Cadillac Owners Member
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    Re: 02 deville soft brake pedal

    i bled the abs unit with a modis and the pedal is still soft i just wasnt sure if this was a problem with theses cars

  13. #12
    MoistCabbage's Avatar
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    You haven't answered the questions in posts 5 and 7. Are you sure the pedal isn't just soft, compared to other cars you've driven?

  14. #13
    kasrx7000 is offline Cadillac Owners Member
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    Re: 02 deville soft brake pedal

    no the pedal will go to the floor

  15. #14
    MoistCabbage's Avatar
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    To the floor?! That's a bit more than just a soft pedal.

    You still aren't answering all of our questions. Was it like that before the master cylinder was replaced?

  16. #15
    basscatt's Avatar
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    Re: 02 deville soft brake pedal

    Quote Originally Posted by kasrx7000 View Post
    no the pedal will go to the floor
    -----------------------
    try this -

    start the engine - pump the brake pedal quickly - 10 times -
    then hold the pressure -

    did the pedal "pump-up" to a higher/firmer position -

    does the pedal remain in the same position -
    or does the pedal slowly creep down -

    if the pedal DOES slowly creep down -
    pump the pedal 5 times - then hold it -
    does the pedal pump back up - does it again slowly creep down -

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