brakes pulsating

[Caman96]

Properly lubed NEW caliper slide pins eliminated pulsating on mine.

 

[1madmouse]

I had a set of rotors warp, had them turned didn't solve problem. Once replaced with quality new rotors all has been good

 

[Burntoutaccountant]

As someone who works in a repair shop, try power stop rotors and pads. Ac Delco stuff isn’t great and squeaks a lot. Have your rear drums and e brake looked at too.

 

[Supercharged111]

My rotors get heat checked before they warp, little cracks forming on the face of the rotor. I assume from towing. That or I drive like an *******.

 

[Pinger]

"When the ABS control module detects a difference in the average speed of the rear wheels compared to the vehicle's overall speed, it initiates antilock braking." https://www.aa1car.com/library/abs_kelseyhayes_rwal.htm has a very good explanation of how the Kelsey-Hayes RWAL system works.

A good description of the RWAL system here >>

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At 30min 50s (if it it doesn't open there).

 

[KillerGmcTruck1988]

well bled the whole system and all seems to be good so far

 

[KillerGmcTruck1988]

well all has been well since bleeding, but now has slowly came back in the last few days

 

[Schurkey]

well all has been well since bleeding, but now has slowly came back in the last few days

WHAT has "slowly came back"? The pulsation? Is it the ABS activating when it doesn't need to? If so, fix the ABS. Likely a wheel-speed sensor problem, but could be other things.

If it's not the ABS, apply the park brake slowly at ~15 mph--where safe. As the park brake is pushed further, does the pulsation occur? Yes--rear brake problem. No--front brake problem.

If it's the rear, get the drums cut or replaced, and verify that there's no rust between drum and axle flange or hub, or between wheel and drum. Torque the lug nuts evenly. See what happens.

If it's the front, check rotor runout and thickness variation, or just cut/replace the rotors. Assure no rust between rotor and hub, or between wheel and rotor. Torque the lug nuts evenly. See what happens.