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1999 GMC Sierra pulsating brakes

Tiny
ZIBBYDS
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 15,000 MILES
When appylying brakes at any time when moving it kinda shakes, or pulsates like the antilock is kickin in. What do I do?
Monday, October 27th, 2008 AT 10:43 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

if this is a pulsation in the brake pedal, get the rotors machined, as one or more will be warped, just make sure that they check the thickness first as there is a min safe thickness that should not be exceeded.

Mark (mhpautos)
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Monday, October 27th, 2008 AT 10:49 PM
Tiny
ZIBBYDS
  • MEMBER
  • 1 POST
I pulled the tires off and the front(outside) of rotor is smooth and the inside is a bit grooved. It was fine until we parked it and drove it minimal. Think sitting woudl cause them to warp, the pads have at least 3/4 left on them for sure.
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Monday, October 27th, 2008 AT 10:59 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
You will not see this warpage we are talking about thousandths of an inch, .040"-.060" run out is enough to give you this pulsation, I would get it check out.

Mark (mhpautos)
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Monday, October 27th, 2008 AT 11:08 PM

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