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Old 06-04-2013, 11:55 PM
evanwest94 evanwest94 is offline
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Location: FREMONT
Join Date: Mar 2013
Posts: 81
Mein Auto: E39 540I
Re: 540i sport keeps warping front left rotor

As everyone is saying. The piston is sticking on the caliper. Breaking it in won't do anything if its sticking. It would save you a lot of money if you just buy a pre loaded caliper and pad assembly. The rotors never turn or resurface well. So new rotors are recommended too especially on German vehicles. Calipers get old too. An easy test you can do is to spin the right and left front and if one is harder to spin as in your case its the left front. Then there's your problem. Calipers are often overlooked so replace them every time you do a brake job. Pad slaps are no good

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