pulling right fixed!!!
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Freshman User
Joined: Feb 2008
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pulling right fixed!!!
JUst got new rotors from dealer. (i know, like my wife says, I'v got more dollars than sense) and truck was pulling badly to the right. After couple hundred miles no diffence so I took it back. Dealer called to say its done and said one rotor was thicker than the other so they turned it. I'm thinkin no way its right, makes no sense to me. Anyhoo, it freakin worked. Any ideas as to why?
It's a 99 super duty with 118000
It's a 99 super duty with 118000
Thread Starter
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Freshman User
Joined: Feb 2008
Posts: 31
Likes: 0
Thanks ReAx, I forgot to mention it was just during braking. In my mind, since each caliper slides it shouldn't matter if a rotor is thicker. I am not a mechanic and have no experience with brakes. Does only one side of the caliper slide? Thanks again for the reply.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Why? The caliper's can't tell so much if the area it's squeezing is thinner than the other. Until there is enough pressure to compress the thin side more than the thick side, the thick side is going to drag more/earlier. Once you achieve enough pressure where the caliper is fighting back, then there should be a pressure differential between the two calipers. I believe the master cylinder pushes out several hundred pounds of pressure, I don't think that it's going to start squeezing the thin side more until the pad stops compressing.
It's all theory to me, but it seems sound enough.
It's all theory to me, but it seems sound enough.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Although thinking about it more, it's actually got a volume component. So you press X volume of fluid at a constant pressure in both calipers. The one that has to travel farther has to fill more space than caliper that doesn't. Perhaps they do have to equalize a little in volume, but because brake fluid isn't compressible I don't think it will fill in with less pressure, but there will be less pressure on the side that has to move the furthest.
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Calipers always squeeze to the rotor thickness and then back off about .020 when pedal is released so there isn't any difference in regards to rotor thickness and brake force. his problem was pin related most likely..
Dick
Dick
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Cargo Master
Joined: Dec 2003
Posts: 2,022
Likes: 4
From: Redford, Mi.
I agree, pin's or something else they missed or screwed up on, I can't see the rotor thickness BS at all.
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The thickness of the rotor doesn't matter when it comes to braking ability. The heat dissipation changes, but it's not going to make a difference all the time.
I bet the pins on one side were sticking.
