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Shelby front rotors


car dude

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Has any one had problems with the Shelby cross drilled and slotted front

Rotors?

I have a 08 GT500 i bought the Shelby front rotors when they first came out

It was months before i was able to install them. All i do is drive my its a daily driver.i have never tracked

It or drag race it. No repeated high speed stopes.about two week ago when i applied the

breaks my steering wheel would shake. Today i swapped them out with my factory rotors

and now i no longer have a shaking in my steering wheel when i apply the breaks.

 

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Wow, if they only lasted that long during normal driving I guess I'll take them off my 'to buy' list. I thought they'd be a nice car show touch, but not if they would only last on summer's worth of driving...

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Need to explain the shake to understand if there is something else at fault. Shake can be nibble where steering wheel moves back and forth about the center (kind of a twitch left to right to left). Other is steering column moves vertically.

 

Nibble may vary in magnitude based on thickness variation if both rotors have developed some. As thin areas align due to being in phase due to turning actions it should be less. Out of phase (thin on left 180 degrees from thin on right) creates more noticeable.

 

Generating the thickness variation generated from rotor condition can only be that it does not have correct runout on plates. Cause is more likely lining being aggresive on braking surfaces or the caliper pistons not retracting correctly after brakes have been applied.

 

Aggressive lining can score surface and/or show as increase wear at the outer diameter. Mileage you have on these could show a little but, nothing like set edge in +0.5 mm range.

 

Caliper causing drag to me would be most likely. Severe will result in rotor developing a blue cast. Intermittent or lite persistent contact is not visible to the eye, only lab measurement finds 15 micron range that can create a shake..

 

Having the production rotors is better to me as you can easily have them turned to bring back to true shape condition. Cross drilled and slotted require a very good machinist to not create more problems as tool travels over the interuptions in the surface.

 

Only offering based on experiences working in brakes. I trust that the SPP Rotors are going to dimensionally match or beat a lot of product competition. Diagnosing is important to not have reocurring issue.

 

Tom

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Need to explain the shake to understand if there is something else at fault. Shake can be nibble where steering wheel moves back and forth about the center (kind of a twitch left to right to left). Other is steering column moves vertically.

 

Nibble may vary in magnitude based on thickness variation if both rotors have developed some. As thin areas align due to being in phase due to turning actions it should be less. Out of phase (thin on left 180 degrees from thin on right) creates more noticeable.

 

Generating the thickness variation generated from rotor condition can only be that it does not have correct runout on plates. Cause is more likely lining being aggresive on braking surfaces or the caliper pistons not retracting correctly after brakes have been applied.

 

Aggressive lining can score surface and/or show as increase wear at the outer diameter. Mileage you have on these could show a little but, nothing like set edge in +0.5 mm range.

 

Caliper causing drag to me would be most likely. Severe will result in rotor developing a blue cast. Intermittent or lite persistent contact is not visible to the eye, only lab measurement finds 15 micron range that can create a shake..

 

Having the production rotors is better to me as you can easily have them turned to bring back to true shape condition. Cross drilled and slotted require a very good machinist to not create more problems as tool travels over the interuptions in the surface.

 

Only offering based on experiences working in brakes. I trust that the SPP Rotors are going to dimensionally match or beat a lot of product competition. Diagnosing is important to not have reocurring issue.

 

Tom

 

 

Thank you Tom

At slow speed there was no hint of a problem. At speeds above 45 mph when applying

The breaks the steering wheel would shake from left to right .i will inspect the rotors

And look for some blueing hot spots

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