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My 91 chevy caprice just started to pulse the brake pedal with abs light on, shut down restart works fine, car brakes great. any ideas

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Pulsing of Brake Pedal is Usualy Caused by Rotor RUNOUT Meaning Hot Spot on Rotor -<a thicker spot on rotor , The FIX is replacing rotors

Posted on Feb 22, 2009

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Posted on Jan 02, 2017

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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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run a fault code reader to reset the abs and trac lights as the trac light uses the same sensor as the abs.. IF the pedal is still soft then there is still air in the brake system. You may have to crack the lines at the master cylinder first and bleed there first then start at the longest line and work back to the shortest

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If you're not losing any brake fluid then it sounds to me as though the master cylinder is bleeding fluid between to two chambers allowing fluid to pass from one to the other which would decrease the pressure on one of the lines leading to the proportioning valve, thus setting off the 'brake' light.

Orrrrr,

IF it does NOT have the hydroboost system the following steps MAY help diagnose if it's a booster problem.

(Copied and pasted from a youtube comment)

Test 1) 1. Start the car 2. Let it idle for 2 minutes 3. After 2 minutes turn off the car 4. Pump the brake pedal 3 times 5. The pedal should rise every time if it does then the Booster and Check valve are OK 6. If the pedal doesn't then the is an issue with the either one, run tests 1 and 2.

Test 2) 1. Start the car 2. Let it idle for 2 Minutes 3. After 2 minutes push down the brake pedal and HOLD it 4. While holding the pedal down turn off the car 5. The pedal should NOT rise for at least 30 seconds 6. If it doesn't rise then the Check Valve is good 7. If the pedal rises before 30 seconds then the Check Valve is faulty.

Test 3) 1. Shut off the Engine 2. Pump the brake pedal 4 times 3. On the 4th one keep it pushed down and start the car while holding the pedal down 4. The pedal should sink down. 5. If it sinks, the booster is Fine.

Myself, I'm leaning towards the master cylinder having an internal 'leak' or bypass problem.

Hope this helps.

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Brake problem.


bleed the brakes again starting form the longest line back to the shortest
if you have been getting a pulsing feeling at the pedal under normal brakes you have warped rotors that need replacing or machining
under normal brakes the abs is not effective and it is only under sever brakes that you will experience the pulsations at the pedal

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Can the ABS system fails on a 1990 Chevy Suburban and that allow the brakes to lock up on it?


If the ABS fails, the brakes will lock up when you brake hard enough to have needed the ABS system to engage. The ABS works by sending a pulsing action through the brake system when you brake hard enough to lock up the wheels.
In the old days before ABS we used to have to pump the brake pedal to achieve a pulse in an attept to keep from locking up and sliding. The old way of doing it is no where near as effective as modern ABS.
You should never pump the brake pedal on a vehicle that is equipped with ABS. If your ABS has failed, yours and others safety is at risk. Get it fixed ASAP.

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Check to see if the caliper bolts are installed correctly .

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ABS, Brake Light Are On


ABS is near the breaks when you take the tire off and the break pads you will see it it is very small part that is a sensor. mine went on my car when the guys were putting my breaks on it it really has not made to much of a difference in the breaks. they are costly so I just deal with the ABS light for now til summer

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ABS and Brake Light Are On


I would lean towards a wheel speed sensor.

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