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86toy Member
Joined: 20 Jan 2010 Posts: 61 Location: tacoma
1986 Pontiac Trans Am
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Posted: Wed Feb 17, 2010 5:27 am Post subject: brake booster problem? |
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I am hearing a hissing or swooshing sound when i apply my breaks. is it possibly my break booster? leaking. my break light is on in the dash, plus the break pedal is soft, but when i pump the breaks they work good. but light still stays on. _________________ 86 t/a 305 tpi 700r4 3.73 possi 4 wheel disc
245/45/17 restoring |
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91RSVert Member
Joined: 16 May 2007 Posts: 2736 Location: AR
1991 Chevrolet Camaro RS
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Posted: Wed Feb 17, 2010 7:57 am Post subject: |
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Normally, when the booster goes bad, the peddle gets stiff/hard.
But then again, the hissing sound sounds like the booster.
Light on has nothing to do with the booster, thats is normally the mc itself.
I would start at the mc itself. _________________ 2008 GMC Z71
1991 Camaro RS Vert
1972 Jimmy 4x4
20ft Longhorn Car Hauler
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Wed Feb 17, 2010 7:09 pm Post subject: |
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Does it hiss only while the pedal is moving? or does it continue to hiss while you hold the brake?
If its only while its moving I wouldnt worry bout it. If it hisses the whole time your foot is on the brake then you need a booster. The diaphram has cracked and when you flex it, it opens up and sucks air. |
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DBL_TKE Member
Joined: 28 Feb 2007 Posts: 1505 Location: Aloha, OR
1991 Chevrolet Camaro Z/28
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Posted: Wed Feb 17, 2010 10:43 pm Post subject: |
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Hmmm, When I press my brakes there's a hissing sound, and even after replacing my brakes all around they still suck. I'm watching this closely. _________________ Richmond 3.73 posi| 36/24 sway bars | SLP LM2 | Koni's | Ground Control 800/200 | Y2K wheels | Dyno Don headers & Y-pipe | airfoil | BBK underdrive pulleys | Raised strut mounts | Extended ball joints | LCARB'S
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86toy Member
Joined: 20 Jan 2010 Posts: 61 Location: tacoma
1986 Pontiac Trans Am
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Posted: Wed Feb 24, 2010 7:43 pm Post subject: |
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It hisses,s all the time until i let off the pedal now, so im possotive its the brake booster is leaking internaly,which sucks _________________ 86 t/a 305 tpi 700r4 3.73 possi 4 wheel disc
245/45/17 restoring |
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Quasi-Traction "I have petals"
Joined: 24 Oct 2005 Posts: 3873 Location: stumptown
1986 Chevrolet Camaro Berlinetta
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Posted: Thu Feb 25, 2010 11:21 am Post subject: |
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DBL_TKE wrote: | Hmmm, When I press my brakes there's a hissing sound, and even after replacing my brakes all around they still suck. I'm watching this closely. |
likewise. My car hasn't been stopping like it should for quite a while. Haven't noticed a hissing, but the petal is uber-stiff. _________________
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