DashingMax wrote:Typically when do ROTORS need replacing (vs resurfacing)?
I'm at 32k and get vibration when braking. Should I replace pads & rotors or just the pads?
Rotors should last through 2 to 3 pad changes pretty easily. This is based on my experience with my previous Q. With my current M, the pads are lasting longer than that other car though.
Currently, I am at 75k miles and probably close to the end of my second set of pads. The next change, I may need new rotors too ... but, for you, I would not recommend changing the rotors at 32k. If necessary, get them resurfaced, as long as the rotor thickness is not too low for that.
Also, vibration when braking usually means one of two things:
1. Your tires need balancing. Surprisingly enough, this symptom of shaking is often mistaken for "rotor warp". Try balancing the tires before you replace rotors.
2. Your rotors need re-surfacing (and/or your pads were not broken in properly when installed - this is not as likely since the vibration would have shown up sooner). If you are on your first set of pads, then it is probably time to change them anyway.
Make sure that the technician follows pad break-in procedures when they are replaced and/or the rotors are resurfaced. If not, then do it yourself:
Get the car up to speed on an empty road (over 50 mph) and do a series of ten hard braking sessions (NOT to a complete stop - that leaves the hot pad sitting on a single place on the rotor and that is not good), with about 30 seconds to a minute between speed and braking. This warms up the pads and deposits pad material films (not clumps) on the rotor surface and makes for an excellent braking experience for many miles.
Z