ABS Causing Pedal Pulsation?
Thread Starter
Instructor
Joined: May 2010
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ABS Causing Pedal Pulsation?
1995 w/ 26,500 miles. I get pedal pulsation when braking, but not all the time. This leads me to believe that the ABS is working when it doesn't need to. Can this be caused by air bubbles in the brake lines and would bleeding the brakes cure it? Car is driven carefully.
Drifting
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From: SW Chicago Burbs IL
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From: Melbourne, Victoria, Australia
The abs system does a self test from the car being started at around 5-10mph, you may notice the pulsation thru the pedal if you have your foot on it. Apart from that the ABS should only activate if a sensor notices a wheel slows more than the others. You should also hear the rapid pulses as the ABS is under the rear storage compartment and thru your brake pedal. Check your abs sensors for any visual signs of damage, and they have not lost a retaining bolt. As for air in the system it should not affect the abs, (the ABS should only work when a wheel is about to lock) just give you a spongy pedal all the time.
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From: Glenbeulah Wi
When the rotor is cool it may have no pulsing as it warm up the pulsing will start. I have seen this many times.
Racer
Joined: Oct 2012
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From: Huntsville AL
If a car sits for weeks at a time in a humid environment it can develop surface rust on the rotors. The rotor doesn't rust under the area protected by the brake pads. This "clean" spot can cause shudder or pulsation until the rust wears away.
That could do it too.
That could do it too.
Burning Brakes
Joined: Apr 2012
Posts: 888
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From: Ridgecrest Ca
My 90's peddle never pulsates nor does the light come on except when I turn the key to on so I know the light works. I've even panic stopped on purpose and no pulsing nor did the light come on and none of the wheels locked up.