Warped rotors
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Elder User
Joined: Mar 2006
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From: Bellville TX. Wof Houston
Warped rotors
Been reading a lot about the shake, bump steering issue " or what ever ya wanna call it"
the other day I noticed while in reverse and foot lightly on brake pedal I hear a little noise like every time the wheel goes to that spot.
wondering how do you tell if the rotors are warped ?
thanks
the other day I noticed while in reverse and foot lightly on brake pedal I hear a little noise like every time the wheel goes to that spot.
wondering how do you tell if the rotors are warped ?
thanks
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
They don't really warp like wave washer, it's more of one spot gets hardened and stays slightly thicker and heavier than the rest.
The test for true (I can't think of the real term), would be to put a dial indicator at a fixed distance and let it measure the pad surface. If it fluctuates, then your out of true. Most people just try to feel it through the brake pedal, if the pedal vibrates while stopping there is something forcing the caliper back in at certain spots.
The test for true (I can't think of the real term), would be to put a dial indicator at a fixed distance and let it measure the pad surface. If it fluctuates, then your out of true. Most people just try to feel it through the brake pedal, if the pedal vibrates while stopping there is something forcing the caliper back in at certain spots.
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They don't really warp like wave washer, it's more of one spot gets hardened and stays slightly thicker and heavier than the rest.
The test for true (I can't think of the real term), would be to put a dial indicator at a fixed distance and let it measure the pad surface. If it fluctuates, then your out of true. Most people just try to feel it through the brake pedal, if the pedal vibrates while stopping there is something forcing the caliper back in at certain spots.
The test for true (I can't think of the real term), would be to put a dial indicator at a fixed distance and let it measure the pad surface. If it fluctuates, then your out of true. Most people just try to feel it through the brake pedal, if the pedal vibrates while stopping there is something forcing the caliper back in at certain spots.
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
The rotors (especially the front rotors) generate a lot of heat to stop these nearly 4 ton monsters, Towing adds to the braking load, especially if your trailer brakes are marginal or not adjusted properly. Once overheated, it doesn't take much to cause the rotors to cool unevenly and warp a little.
Some brake shops will turn down the rotor to make the surfaces parallel, but I shy away from that based on the reasoning that if the rotor warped when it was X thick, X minus 40 thousands of an inch will warp a little easier next time.
Some brake shops will turn down the rotor to make the surfaces parallel, but I shy away from that based on the reasoning that if the rotor warped when it was X thick, X minus 40 thousands of an inch will warp a little easier next time.
Post Fiend
Joined: May 2006
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From: Central Florida
Parallel variation is what it's usually called. This is the main cause for a vibration while braking. Usually it is felt the faster you are going, and there is no real noise, but more a pulsation in the pedal. If you are hearing a noise at low speed I would try looking elsewhere while you have the wheel off.
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Elder User
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From: Bellville TX. Wof Houston
Parallel variation is what it's usually called. This is the main cause for a vibration while braking. Usually it is felt the faster you are going, and there is no real noise, but more a pulsation in the pedal. If you are hearing a noise at low speed I would try looking elsewhere while you have the wheel off.
Reread post pls
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Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
If you get new rotors try to get American made, I got Raybestos from Pep Boys, they were made in Chicago at the time for my E250. Was back to Ford every 5,000 miles when under warranty for bad rotors. Going on over 60,000 miles now with these, never turned, still like brand new, no weeble, wobble, nice and smooth.
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Senior User
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Explain better? Rotors don't actually warp, they become uneven side to side.
"Warped" rotors is not causing a noise. Look elsewhere.
"Warped" rotors is not causing a noise. Look elsewhere.
Senior User
Joined: Dec 2007
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From: Lower Hudson Valley, N.Y.
Are you thinking of run-out?
Later...
Brewster...
Later...
Brewster...
Last edited by Citypol86; Feb 23, 2009 at 09:22 AM. Reason: Correction
Freshman User
Joined: Dec 2008
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use a dial caliper to check rotor worpage and you said you were going in reverse when you noticed it ? And before you have them turned if that is what you find ,find the specs for the rotors before yopu waste money.
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From: SE WI
Elder User
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From: SW Idaho
GM and Dodge have TSB's regarding this... (applying Ebrake when hot)
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Elder User
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From: Bellville TX. Wof Houston
the post origional post was....Maybe explaned diffrently
while in Reverse with foot slightly on brake I hear a noise comming from brake area. it seems to only be persent while braking.
soundl like pads rubbing MORE in one area than another. Made me think of the ole worped rotors issue.
thanks again