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FFCobra Master Craftsman
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Discussion Starter · #1 ·
I'm running IRS, with Mustang Cobra rotors and calipers, attached to the T-bird uprights with Lisman brackets. The passenger side brake has a nice fat shiny rotor surface, about the width of the brake pad. The driver side brake has about 1/4"-3/8" LESS rotor area being wiped by the brake pad. It's like the pad sits against that rotor at a slight angle. I figured after a coupole of autocrosses the pad would wear in and start wiping it's full width on the rotor. Been using the brakes heavily for two practice days so far, and no change in wipage on that rotor. Any ideas how to track down the cause of this thing? There's nothing out of whack visible on inspection, and all bolts are tight. I can't FEEL any difference during braking, and there is no "pulling" one direction or another. So, I'm inclined to not worry about it, but if it's a significant issue I'll get on it. Thanks for any ideas.
 

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FFCobra Fanatic
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John,

Sounds to me like it might be possible thet your drivers side caliper bracket is slightly bent and off of a 90 deg. orientation. Maybe not enough to the naked eye to look different, but enough to impact disc pad wear in the way you describe. Looking at BOTH sides of ther rotor surface, are the wear patterns top to bottom opposite? If they are, that may be your problem.

See Ya

Jeff E.

[ September 08, 2002, 12:48 AM: Message edited by: J-MAN ]
 

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hi john,

you can index the caliper/pad to the rotor or just keep driving it. two days is way too soon to see the two mating together 100%. try 500 miles!

my advice, look at it in a couple of months


-james
 

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FFCobra Master Craftsman
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Discussion Starter · #4 ·
Jeff and James, thanks for the input. I just checked the rotor; the inside surface is polished perfectly by the inside pad, so only oddity is the outside rotor/pad interface. I'll just use the brakes as hard as I can awhile and see if that makes it go away. Thanks again!
 

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John, Just a note. Make sure you use AntiSieze on the long bolts that the caliper slides side to side on. I have seen these hang up and cause irregular wear. It's not cheap stuff but will last a long long time and is critical to the calliper operation. If you have sealed units then you should be able to push them back and forth with your hands. Good Luck
 

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John,

I have the same problem with one side in the rear. I am running Wilwood 4-piston and a custom one-piece aluminum bracket that I machined on a milling machine. I am running 12" Baer rotors. I know the bracket is fine, and braking is good, so I haven't worried about it. It's slowly disapearing. I've got about 1,000 miles.

For now, I wouldn't worry about it.

craig
 

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FFCobra Master Craftsman
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Discussion Starter · #7 ·
Michael and Craig, thanks for your help. I'll check the pins next time the car's up on jacks and anti-seize em if needed. Nice to know that even Wilwoods can be a little off!
 
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