Originally Posted by ISMSOLUTIONS

There are several reasons why rotors needs to be turned:

1 - they are warped

2 - there are hot spots throughout the rotor (glazing), and those need to be turned out, otherwise the next brake job wont last and you'll get lots of squealing.

3 - rotors can just be turned because of brake squeeling...whenthe surface hazes, it will make noise and cause excessive heat as well.

Be careful with some shops though. Make sure they tell you what the minimum thickness is and write down what it is after the turning. The thinner a rotor gets, the hotter they will be as well, and that will affect your braking potential. They should also do what's called a cross hatch on the rotors after being turned. Basically they take a sanding pad to the rotor, while it's turning, and put circular scratchers into it. It helps with initial adhesion and brake pad seasoning.

Typically, there are at least 2 cuts done for a rotor turn. 1 to get the 'bad' metal off and the surface completely flat (no warping), and a final cut to clean the surface properly. Depending on the rotors and your driving, your's could need 2-3 turns before the final cut. AND DON'T FORGET, when they are thinner, they don't work as good, regardless of specs.

If you have Brembo's - I would look at the TSB and get to the dealer. If you don't, you may want to consider a better aftermarket rotor, likely slotted or cross drilled. They will dissipate the hear much better, last longer and allow your pads to work more efficiently. You may also want to consider upgrading the pads as well.

This doesn't have to cost $$thousands$$. the general braking system in these cars is very good, but better pads and rotors make a huge difference. Also, for $100, put some stainless brake lines on at the same time...you'll never have a squishy pedal!

Rick

Originally Posted by fairwaywiz

i wish this post was here 2 months ago before i spent over 1200 dollars at les schwab

Originally Posted by ILuvMyG35

.....What is a rotor runout?.....