OT follow up on chevy car advise

F150Mustang · Jun 30, 2009

First off, thanks for all the replies about the thumping brakes.
Heres what i know now, as metioned before, it has all brand new brakes and rotors on the front and the thumping continued. I pulled the tires off and set a block up next to the rotor and run the car about 20 mph with a steel rule almost touching it (i know its not a perfect idea but it worked), i cant see or feel any warp in the new rotors. I next moved front tires to the rear and backs to the front (a visual inspection of the tires looked good). Still had the same warped rotor feel as before.
During the test drive i applied the parking brake and allowed the car to come to a slow stop from 35mph, then applied it harder from a 50mph roll and had no "thumping/pedal pulsating". I just seen the reply about the slider on the caliper being bad and will have to look in to that in the morning. All i know is both sides moved freely when i put the pads in.
Thanks again for the replies, they were helpful.

npuller · Jun 30, 2009

Look at your in and outer tie rods for wear.
The outers are likey to have play.

tlak · Jul 1, 2009

Check motor mounts and ball joints.

Lamar Fudd · Jul 1, 2009

I have never seen a warped brake disc. I have seen lots of of discs with pad material unevenly deposited on the friction surfaces - sometimes visible and more often not. In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation or run-out due to hot spotting that occurred at elevated temperatures.

Pads that function primarily by abrasion have a high wear rate and tend to fade at high temperatures. When these pads reach their effective temperature limit, they will transfer pad material onto the disc face in a random and uneven pattern. It is this "pick up" on the disc face that both causes the thickness variation measured by the technicians and the roughness or vibration under the brakes reported by the drivers.

F150Mustang · Jul 1, 2009

Thanks to all for the advise. Just this afternoon i was able to figure it out. It was a bad patch on a rear rotor, i never saw it while looking and kinda feel like a doofus. New brake pad and rotors on the rear and all is well. Really wasnt all that bad as the front brakes were bad anyways. I just wasnt about to throw parts at it untill i was certain i knew what it was. Thanks again!

OT follow up on chevy car advise

F150Mustang

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npuller

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tlak

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Lamar Fudd

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F150Mustang

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