Question about 1998 GMC Sierra

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Abs sensor while braking at low speed brakes pulse and need couple pumps to get them back. could it be abs sensor being dirty

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No, the pulsing is caused by warped rotors. Look at the inside part of each wheel to see if you're loosing brake fluid. If everything is dry, try bleeding the brakes and check you brake fluid level. If it still does it, remove the vacuum hose from the engine that goes to the brake booster and plug it. The pedal should be very solid. If it bleeds off still, replace the brake booster.

Posted on Aug 30, 2008


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Often this fault is trigeered by poor rear brakes, normally the brake pads in the back, the system knows the brakes are low but compensates to the front to slow the car even at low speed, if the back calipers are pushed all the way out the ABS thinks the back brakes are defective so puts more to the front. Hope that makes sense.

so long as they are working thats a good sign and means the pump is ok, I would check the level of the brake pads back and front and also check the brake fluid level. failing all this then have the brakes bled through, to much air can also confuse the ABS, lastly and least likely the ABS module coud be going funy, they are pretty cheap and easy to swap over, but I am more inclined to think this is a mechanical fault and not electrical



p.s they have 4 sensors one on each wheel for the ABS, this wont make tha car brake like that but they could be dirty and sending the wrong signal to the module.

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Feels exactly like warped rotors only its not.

Yes, a loose caliper could cause pulsing brake pedal.

I guess it's possible for malfunctioning ABS sensors to cause this problem. If the sensor is sending a false signal that the wheels may be locking, the brakes would start "pumping".

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