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Abs vibrates/pulses with soft touch on the brake on dry pavement. Pads and rotors are good.

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There are sensors on each wheel. The sensors will have wires connected to them and they will stick through the backing plates or calipers. Next are the round metal plates which turn with the tires.

These 2 parts can get magnetized brake dust and steel dust on them and they will misread the revolutions of the tire. You want to clean them as best you can. Also check the Emergency brake system inside the rear rotors. Check the drum surface inside the rear rotors as most tend to corrode and the metal flakes off. The flakes can cause the ABS to misread the revolutions.

If all is well and clean for the sensors, they only 2 things left are the Proportunate Valve and the Master Cylinder. With a light touch, the Proportunate valve may slow one end of the car first, causing the ABS to activate. If the Master cylinder is not shooting the correct pressure to all discharge ports with a light touch, there can be a difference in volume sent to the Proportunate Valve triggering the ABS.

The pressure can be measured, but the cost of doing it may exceed the cost of the replacement parts. You may want to go to a Salvage yard and find a car with a sealed system and get your parts.

Posted on May 11, 2010

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1 Answer

2005 Chevy impala brake pedal pulsation with brand new rotors installed


Is your ABS working properly? Under heavy braking the ABS should engage and 'pulse' the brakes on/off. It is normal to feel the brake petal flutter or pulse under your foot.

Under light braking there should be no pulsing as the ABS does not engage and you have changed the rotors and pads.

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ABS vibrates/pulses with soft touch on the brake on dry pavement. Pads and rotors are good.


unless a code is set which will require an automotive scanner there really isnt anything you can do at home.

Are you sure all the tires are the same and have proper pressure.

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