1997 GMC C1500 noise

SCRANTONG

MEMBER
1997 GMC C1500
V8
4WD
AUTOMATIC
130,000 MILES

When I step on my brakes I hear a vacuum type sound, what could be the cause of that? Does it mean the brakes need to be replaced?

Friday, August 29th, 2008 AT 10:46 AM

7 Replies

BLACKOP555

MECHANIC
10,371 POSTS

Can you describe what a vaccum sound is like? Do you notice any decrease in the performance of the brakes?

Have you noticed any issue wiht the performance of the vehicle?

Does the sound you hear such as when the engien is off and you push on the brake pedal, is that the sound your hearing?

SPONSORED LINKS

Was this

answer

helpful?

Yes

Friday, August 29th, 2008 AT 1:49 PM

SCRANTONG

MEMBER
4 POSTS

I hear it both times when using the brakes and also when the car is shut off

Was this

answer

helpful?

Yes

Friday, August 29th, 2008 AT 2:02 PM

BLACKOP555

MECHANIC
10,371 POSTS

But what is the sound? I dont know what you mean by vaccum.

Was this

answer

helpful?

Yes

Friday, August 29th, 2008 AT 9:18 PM

SCRANTONG

MEMBER
4 POSTS

Kind of like a hissing sound, even when I step on the brakes I hear it.

Was this

answer

helpful?

Yes

Saturday, August 30th, 2008 AT 1:55 PM

BLACKOP555

MECHANIC
10,371 POSTS

You notice any decrease in brake performance as prevously listed.

The brake level still good?

SPONSORED LINKS

Was this

answer

helpful?

Yes

Sunday, August 31st, 2008 AT 3:38 PM

SCRANTONG

MEMBER
4 POSTS

The brake is very hard to press, before I could press them and stop on a dime if needed. I need to put a lot of pressure on to press it down now. It is not always making the noise when I step on it. But when it does it kind of sounds like something letting air out.

Was this

answer

helpful?

Yes

Monday, September 1st, 2008 AT 9:46 AM

BLACKOP555