 WTF is going on???? |
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 May 30 2009, 10:10 PM
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#1
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Wine O'Jackass!  Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54  |
OK I am stumped...
When I push on the brake pedal, it makes this hissing (like fluid not air) noise.... I replaced the master cylinder.. still there.... car runs pretty well, but does get an occasional sputter/backfire when revving it in park.. the odd thing is when its in park, if I push on the brake pedal, and give it some gas, the pedal "pushes" back up.. IE it feels like the brake pedal is sinking when I push hard on it at idle, but it firms up when I give it gas.... is it the brake booster?? a vacuum leak somewhere??? I found a couple minor ones, some dry rotted hoses etc.... and that helped the stumbling problem a bit... where do I look???? Jonathan |
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May 30 2009, 10:10 PM
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May 31 2009, 12:17 AM
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Senior Member IV  Group: Members Posts: 416 Joined: 18-December 03 Member No.: 221 |
try replacing the plastic valve at the brake booster where the vacuum line hooks to it,,it may be that simple..
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May 31 2009, 08:15 AM
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#3
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Wine O'Jackass! Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54 |
Thanks Kevin, I just tried pulling the one out of my 92 parts wagon, and when I pulled the one out of my 9C1, the booster still had vacuum after sitting over night... I played with the one way valve and it seems to be working fine...
Someone on the ISSF said it might be the booster assembly its self, is there any way to test that (i mean even if it's holding a vacuum) Could it be something with the ABS??? the ABS light has been on for years, I've been meaning to figure it out, just haven't had time.... Thanks Jonathan |
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May 31 2009, 09:14 AM
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#4
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Sparkplug Group: UNYISSO Posts: 11827 Joined: 24-April 03 From: Albany - New York Member No.: 34 |
QUOTE(SSweet9C1 @ May 30 2009, 11:10 PM)    It feels like the brake pedal is sinking when I push hard on it at idle, but it firms up when I give it gas.... is it the brake booster?? A vacuum leak somewhere??? I found a couple minor ones, some dry rotted hoses etc.... and that helped the stumbling problem a bit... where do I look???? Jonathan QUOTE(bad azz vega @ May 31 2009, 01:17 AM) Try replacing the plastic valve at the brake booster where the vacuum line hooks to it,,it may be that simple.. Kevin  Jonathan, Also check the rubber grommet that the plastic brake booster fitting snaps into.  Being that Our Chevys are ALL OLD.  Dry Rotted vacuum lines that leak under the hood.  Can cause many engine run problems with an older vehicle.  I'm not sure how to check an internal vacuum leak on a power brake booster unit. If there was a way to pull vacuum on the unit. Watch to see if the vacuum gauge holds vacuum or not. 
This post has been edited by Heavy Chevy 95: May 31 2009, 09:17 AM |
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May 31 2009, 10:20 AM
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#5
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Senior Member IV Group: UNYISSO Posts: 359 Joined: 10-February 04 Member No.: 258 |
To check the booster-- with the car off pump the brake pedal-- You should get atleast 2 power assists and then the pedal should get hard-- if it goes to the floor-- replace the booster
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May 31 2009, 10:24 AM
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#6
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Wine O'Jackass! Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54 |
Thanks guys, it does hold a vacuum, (I pulled the check valve out this morning after it sat over night and it still had vacuum) but I think the pedal goes down when pumped with engine off... I'll have to test it and report back....
Thanks Jonathan |
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May 31 2009, 10:35 AM
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#7
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Senior Member IV Group: UNYISSO Posts: 359 Joined: 10-February 04 Member No.: 258 |
i added an indepth test on your topic on issf
http://www.impalassforum.com/vBulletin/sho...d=1#post2072422 |
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May 31 2009, 03:24 PM
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#8
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Wine O'Jackass! Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54 |
Thanks! I am quite sure I need a new booster...
I also found a hole in one of the lines to my evap canister, and a crack in the top of the canister... replacing all the lines and canister tonight.... hopefully that will help my random hesitation and occasional backfiring issue.... Jonathan |
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Jun 2 2009, 09:18 PM
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#9
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Wine O'Jackass! Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54 |
anyone ever replaced a brake booster?
Jonathan |
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Jun 24 2009, 01:15 PM
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#10
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Advanced Member I Group: Members Posts: 35 Joined: 17-April 07 Member No.: 1458 |
QUOTE(SSweet9C1 @ Jun 2 2009, 10:18 PM) anyone ever replaced a brake booster? Jonathan i have. what do u want to know.thers 4 bolts on the firewall inside the car and the clip that attaches the push rod to the pedel. This post has been edited by 94ss9c1: Jun 24 2009, 01:17 PM |
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Jun 25 2009, 05:42 AM
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#11
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Wine O'Jackass! Group: UNYISSO Posts: 2999 Joined: 29-April 03 From: Finger lakes region NY Member No.: 54 |
sorry, I installed the brake booster several weeks ago...
2 nuts on master cylinder, 4 on inside of firewall, and the clip on the brake pedal... very easy..... it took me less than 30 mins start to finish... next time I could probably do it in 15.... Thanks Jonathan |
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