Thread: Brake pedal return issue... unsure if booster or something else

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  1. #1 Brake pedal return issue... unsure if booster or something else 
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    Hey guys. Proud new owner of an 04 grand prix. Always been a GM guy and this car compliments my 00 yukon pretty well.

    Anyhow.. my brake lights stay on and the trans converter clutch wont lockup due to the brake pedal switch not making.
    It doesnt make because the pedal doesn't come all the way back.
    I can lift if back with my foot about another inch i would say. When i do this the switch works.

    What is supposed to bring the brake pedal all the way back? I dont see any sort of adjustment on the brake pedal. I dont think the brake pedal switch is supposed to do that.
    I think the booster is damaged somehow. The brake system itself works fine with no issues.

    What do you guys think?

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  2. #2 Re: Brake pedal return issue... unsure if booster or something else 
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    Heres a pic of it [emoji106][emoji106]

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  3. #3 Re: Brake pedal return issue... unsure if booster or something else 
    Killa Bee Scottydoggs's Avatar
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    try filling the master and bleeding the master then the lines. might have air trapped in the system causing it.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #4 Re: Brake pedal return issue... unsure if booster or something else 
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    Quote Originally Posted by Scottydoggs View Post
    try filling the master and bleeding the master then the lines. might have air trapped in the system causing it.
    Ok. Ill double check that. There is this weird mechanical feeling when i lift the pedal up and push back down with my foot.
    Hard to describe without seeing it in person.

    Pretty sure the master cylinder is full.

    Its got 189k miles on it

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  6. #5 Re: Brake pedal return issue... unsure if booster or something else 
    Killa Bee Scottydoggs's Avatar
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    how do the brakes feel over all? the pedal mushy and push to the floor or normal firm feeling? or maybe hard as a rock?

    if its mush the master is going bad, or it needs to be bleed. rock hard means the boosters not working right. engine off if you pump the brakes the pedal should get harder and harder with each push as it uses up the vacuum in the booster. they can rust and leak out the vacuum on ya running and cause a hard pedal.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #6 Re: Brake pedal return issue... unsure if booster or something else 
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    Quote Originally Posted by Scottydoggs View Post
    how do the brakes feel over all? the pedal mushy and push to the floor or normal firm feeling? or maybe hard as a rock?

    if its mush the master is going bad, or it needs to be bleed. rock hard means the boosters not working right. engine off if you pump the brakes the pedal should get harder and harder with each push as it uses up the vacuum in the booster. they can rust and leak out the vacuum on ya running and cause a hard pedal.
    They feel fine overall.
    No binding, no spongyness, firm normal GM brake pedal except for not coming back all the way.

    Not feeling any drag from them either

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  8. #7 Re: Brake pedal return issue... unsure if booster or something else 
    Killa Bee Scottydoggs's Avatar
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    odd, has to be the booster or master. that rod off the brake pedal pushes through the booster then into the master, so something is not working right. likely booster is messed up. not sure if you can lube it any. if you took the master off maybe you could work the pedal and spray the shaft down.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  9. #8 Re: Brake pedal return issue... unsure if booster or something else 
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    Ok guess what... you guys wont believe this, ill have to take pics tomorrow when its brighter.

    Was looking into this and...when i pushed on the brake pedal with normal effort, something popped.
    I opened the hood...
    The entire booster had broken off of its mounting flanges.
    You can literally wiggle the entire master cylinder/booster assembly all over the place.

    Well i think i found the Problem!! LOL

    also... i am so incredibly thankful that i found this out while i was parked safely in my driveway.
    This could have been VERY BAD if it happened while driving

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  10. #9 Re: Brake pedal return issue... unsure if booster or something else 
    Killa Bee Scottydoggs's Avatar
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    now thats a new one. the booster gets pushed in place and twists to lock in place.

    heres a vid, the bracket on the fire wall may have rotted on you for this to just come free for no reason.

    YouTube

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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