Mixing rotors new and old....
02-26-2007, 02:24 PM
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Mixing rotors new and old....
Painted my calipers today, and realized how bad the lip on my front rotors are. But my rear pads and rotors look brand new!! My question is, if i buy new pads and rotors for the front, do i have to change pads/rotors on rear? I'm not being cheap, but they literally look brand new in the rear. And i figure if it aint broke don't fix it! BTW i'm going with EBC rotors and red stuff pads in the front. Nothing too extreme, just a daily driver.
02-28-2007, 06:16 AM
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The primary reason rotors are replaced is that they become too thin. As they lose weight their temperature rises as a function of the amount of weight lost.
Thinner rotors are more prone to warping faster.
From a safety standpoint as the rotors get thinner the piston extends out of the caliper bore more and more. The piston seals can stretch and fail if undersized rotors are used with totally worn out pads............there is some built in safety margin but after 100,000 miles of use the seals might fail.
ABS is self correcting to some extent as different wheels always have slightly different braking friction from various causes.
Always a good idea to measure and replace rotors as pairs on an axle so that the prior to ABS braking forces are as close to equal as you can get.
Many cars wear RF and LR insides faster, function of body position during braking.
Thinner rotors are more prone to warping faster.
From a safety standpoint as the rotors get thinner the piston extends out of the caliper bore more and more. The piston seals can stretch and fail if undersized rotors are used with totally worn out pads............there is some built in safety margin but after 100,000 miles of use the seals might fail.
ABS is self correcting to some extent as different wheels always have slightly different braking friction from various causes.
Always a good idea to measure and replace rotors as pairs on an axle so that the prior to ABS braking forces are as close to equal as you can get.
Many cars wear RF and LR insides faster, function of body position during braking.
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