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1991 Chevrolet Suburban violent shaking

Tiny
TONYRARENS
  • MEMBER
  • 1991 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
When I apply brakes on an uneven road surface (like road patches or grated surfaces) I get a violent shaking that seems to start from the back and intensify even if I release the brake petal. If I apply brakes on a well maintained road I get no shake. The brakes have all been inspected and cleaned to no avail. Any ideas what is causing this will be appreciated as it makes driving this vehicle very dangerous.
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Friday, August 15th, 2014 AT 4:37 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Where do you feel the shaking the most, the steering or the seat/floor? Have all steering components been checked?
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Friday, August 15th, 2014 AT 7:34 PM
Tiny
TONYRARENS
  • MEMBER
  • 3 POSTS
I feel it on the floor starting in the back and intensifying as it moves forward.
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Saturday, August 16th, 2014 AT 2:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Have you checked axle bearings? Also, are the rear shocks good? This is truly an odd problem if it only happens on rough roads. Also, let me know if you checked the universal joints on the drive shaft.
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Saturday, August 16th, 2014 AT 4:50 PM
Tiny
TONYRARENS
  • MEMBER
  • 3 POSTS
Rear shocks are newer, have not checked bearings but have no leakage from either wheel. Can leaf springs do it?
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Saturday, August 16th, 2014 AT 11:58 PM
Tiny
TONYRARENS
  • MEMBER
  • 3 POSTS
I have had no clunking noises from my u joints at all, and yes this is baffling me as it is only on grooved or uneven road surfaces.
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Sunday, August 17th, 2014 AT 12:02 AM

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