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brake booster problem?

 
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86toy
Member


Joined: 20 Jan 2010
Posts: 61
Location: tacoma

1986 Pontiac Trans Am

PostPosted: Wed Feb 17, 2010 5:27 am    Post subject: brake booster problem? Reply with quote

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. Confused
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86 t/a 305 tpi 700r4 3.73 possi 4 wheel disc
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91RSVert
Member


Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

PostPosted: Wed Feb 17, 2010 7:57 am    Post subject: Reply with quote

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.

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1972 Jimmy 4x4
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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Wed Feb 17, 2010 7:09 pm    Post subject: Reply with quote

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
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Joined: 28 Feb 2007
Posts: 1505
Location: Aloha, OR

1991 Chevrolet Camaro Z/28

PostPosted: Wed Feb 17, 2010 10:43 pm    Post subject: Reply with quote

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.
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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

PostPosted: Wed Feb 24, 2010 7:43 pm    Post subject: Reply with quote

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 Confused
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Quasi-Traction
"I have petals"


Joined: 24 Oct 2005
Posts: 3873
Location: stumptown

1986 Chevrolet Camaro Berlinetta

PostPosted: Thu Feb 25, 2010 11:21 am    Post subject: Reply with quote

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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