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ABS brake pulsations

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wli98122

Member since: 01/03/15

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6 Comments

PS from author

I am sure that my method outlined above is not original, and has been written up somewere else. What I can vouch for, is that I have performed this test on my 1993 Volvo 240 wagon with over 200K miles.. Its brakes had been pulsating for some time, and after checking the ABS electric components exhaustively; it was only after replacing all four original disc rotors, that the pulsations disappeared. The front pair of rotors had 1.5mm ridges, were replaced first, with most of the pulsations gone. However, there were still minor ones, which disappeared once the rears were replaced. Theoretically, turning the rotors on a lathe could have removed the warp, but then the discs would would be thinner, and more susceptible to thermal distortion. I recommended that this kind of work be performed in a licensed brake shop, simply because not all readers have the proper tools or training to do such critical work in a home garage. Failure to securely remount the calipers could result in severe injury.

wli98122 - Reply

I have a 2005 Ford Falcon ute and when I brake the pedal pulsates, is there anything I can do to fix this problem?

Smack That - Reply

To the owner of the Ford Falcon:

As I mentioned in my essay, it looks to be warped disc brake rotors. If you are nervous about doing it yourself or lack the proper tools, take it to a licensed brake shop that you can trust, and ask them to perform a “run-out” test on each disc rotor. If any of them are warped, it is safest to replace them rather than have them machine the originals.

A frequent cause of rotor warp is hard braking. These invariably leads to overheating and warpage.

wli98122 - Reply

Additional note from author:

It is very important that reassembly of the disc brake components be precise and exact. All surfaces must be clean of grime and dirt, and that final tightening be performed with a torque wrench. DO NOT USE AN AIR-TOOL for reassembly. Use it only for disassembly. Also be extra careful not to kink any hydraulic pipes.

wli98122 - Reply

My guy said my rear rotors were warped. Major pulsation is still present

I have to confirm tgat the front rotors were checked. But if so, I then must have an ABS issue. The pulse is intense at 60mph, 50, 30. The entire car shakes and rattles. I'd swear it's gonna drop all four wheels like in a cartoon. 2015 Hyundai Elantra

Peter Janak Jr - Reply

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