R33 Front And Rear Discs

[KrazyKong]

My rear rotors are not smooth and have a curved indent on them on the inner most part of the circle. Again not knowing much about brakes, I thought when they got like this, that you either machined or replaced them. I could certainly just put some new pads on but then the new pads will only be half touching the rotor until they either wear into the curve or who knows? That doesn't feel safe to me.

[jjman]

yeah that's why you machine them to get rid of that lip that build up and reduces braking effectiveness and can also create excessive wear or damage to new pads.

You replace rotors when they are worn to less than a manufacturers minimum thickness as beyond this point you can also suffer from reduced braking effectiveness as well as be more likely to warp a rotor etc. Its often a pretty conservative level though so unless you drive a car hard or track it you don't have to turf them the instant they near or reach the minimum thickness.

If it is just the rear rotors then I definitely wouldn't worry...

Edited August 20, 2014 by jjman