Question about 2002 Chevrolet Silverado

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Pulsating brakes and peddle pushing back up

Most of the time when I brake, they start working properly, and at almost the end of my stop, thay begin to make a noise like a small motor, the peddle pulsates, and pushes back against me hard enough to shove my foot back, and they do not function during that time, then it stops, or sometimes I have to release my foot, and restart braking to make it stop and they function normally again. I have replaced the brake pads, rotors and even the master cylinder in the last few days. is it the abs? or something else causing the problem and what can I do to fix it?

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This is a classic ABS problem. Either the pump or the ABS controller. But as it is causing the brake pedal to push back you should get it seen by a qualified mechanic and DON'T drive it until it is fixed.

Posted on Jul 15, 2013

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Posted on Jan 02, 2017

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ewashmidas
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SOURCE: antilock brake system engages on low speed stops on dry pavement on my 2004 Silverado

Very loose front wheels bearings can cause this.

Posted on Feb 28, 2009

yotaguy
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SOURCE: pulsation in brake pedal and rear end hops during braking

What happens is if you have a bad front wheel bearing when you brake that wheel will turn in or out,when this happens it throws the four wheel alignment out and since this is a solid rear axle,it's forcing it to flex on the suspension,wich could cause the rear tires to bite on the outside edge of one tire and the inside edge of the other,thats one possible the other would be that the rear brakes are are not slowing the wheels evenly causing the same issue.I saw this problem with a bad front wheel bearing on a Nissan Pathfinder but not as pronouced due to the independent rear suspension. Check the front wheel bearings,which of course will mean getting the calipers off the rotors,and then check for any movement in the rotor,if there is check the hub nut,if it's loose tighten it and check for play in the rotor if there is still play that's going to be caused by a bad bearing.You can check the braking in the rear with a simple spring scale(like the ones used for fishing),with the wheels removed have someone apply enough pedal pressure to just engage the brakes but still allow movement attach the scale hook to a wheel stud and pull until it starts to move and note how many pounds of pressure it takes to move the hub.If it's uneven chech your adjusters and even them if needed and then retest,if still uneven you'll need to bleed them again.As far as the dark black substance in the fluid I would say you may gotten a contaminent in the fluid.Brake fluid gets kind of a rusty reddish residue when it breaks down.If I missed anything or you need clarification don't hesitate to ask I'm home all day.Hope this helps solve your problem.

Posted on May 05, 2009

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