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My suburban kind of rattles/knocks in the rear end when driving over quick sudden bumps like a gravel road.

I have 2 questions. Help please. My suburban kind of rattles/knocks in the rear end when driving over quick sudden bumps like a gravel road. Question #1 rattle/knock in back I have checked everything for loose stuff, nothing. Replaced shock absorbers, I am thinking maybe the control arm rubbers are worn out. Or the sway bars, not sure if that's the right names for the rear but... It is getting old, anyone please. Question 2, when turning right or left slightly I hear the pulsating swish swish swish noise coming from the back wheels. Sound like a brake, but when I hit the brake pedal it has no effect. Me E brake shoes are COMOLETELY worn off the medal ring. Could this be it?

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  • Cars & Trucks Master
  • 663 Answers

Rust and bushing wear are problems with the rear suspension components in these vehicles. You did not mention the year, but you probably have leaf springs back there. You need to check the shackle bolts and the leaf retaining rivets for loose or missing parts. If you have coil springs, check the lower spring bumpers - one or both my be badly worn or gone. And yes, any bushings may need replacing.
As far as the brakes are concerned, that is probably the noise you hear. You need to have the shoes replaced right away, and since they are that badly worn, the drums will need to be turned or probably replaced.

Posted on Mar 28, 2015

Testimonial: "It is a 2003 Suburban Z71 1500. It has coil springs, there's not many rubber bushing on the back suspension, just the two on each stabilizer arm that hold the rear end up I guess. The arms I am refering to run from the axle to the frame."

  • EdCarCal
    EdCarCal Mar 29, 2015

    There is clearly something loose back there, usually a bushing. Check the rear axle tie rod and the control arms for play. Also check to make sure the upper and lower spring insulators are in place and not damaged.

  • EdCarCal
    EdCarCal Mar 29, 2015

    One more thing - check your shock installations again and make sure both the mounts are firmly attached (loose bolt or a mounting point that is broken).

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