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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Rear Brake questions



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      04-12-2011, 02:06 PM   #1
clairvoyant
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Cool Rear Brake questions

Well, soon I have to replace the rear brake pads.
The dealer off course recommended that I replaced the rear brake pads + the rear brake rotors.
Can I just replace the brake pads? My brake rotors are still within the thickness guidelines.
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      04-13-2011, 09:54 AM   #2
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Under warranty, I let them do what they want.

Once it become MY dollar, I'm going with what the specs recommend, not the salesman at the service desk.
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      04-13-2011, 08:07 PM   #3
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Yes you can just do pads
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      04-14-2011, 05:33 AM   #4
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The issue is rotor surface condition. You can just replace the pads and they will bed into the old rotor surface and you probably will not have an issue. However, a proper brake job is to have the flattest and smoothest surface for the new pads to bed together with. Resurfacing the rotors is usually done to get the best surface situation for the new pads to bed too.

Resurfacing usually cuts down the thickness of the rotor, which could lead to, over the life of the second pads, a condition where the rotor gets out of spec. However this more of a concern with front brakes (that do more work than rear brakes) rather than the rear brakes, but E90s use a balanced braking system which maximizes the rear brakes, so it is a tough call (and dependent on how you drive).

Replacing the rear rotors just gives insurance that the rotors will not go out of spec during the life of the second set of pads. Also, the cost of resurfacing the rotors is sometimes better used towards a new set of rotors.
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      04-20-2011, 06:01 PM   #5
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What's resurfacing run, $15-20?
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