Brake discs R1 Concepts or OEM Volkswagen

Contrary to what some people think, the rotors are designed to be replaced when the pads have fully worn down. The tolerance for allowable thickness on our rotors is very small. I don't know the exact number off the top of my head, but IIRC the front rotors on your Jetta are 25mm thick when brand new and the minimum thickness is 23mm. That's not a lot of wiggle room. When the pads are fully gone the rotors will be very close to minimum thickness. You can mic the rotors to test the thickness, but made sure you get past the \"lip\" on the very edge of the rotor or you will get a false reading. Personally, I say don't mess around with brakes. If you only have a few thousand miles on the rotor, than fine - keep it. But if the pads are gone, the rotors are gone too. On a somewhat related note, I just did the brakes on a 2006 Mini for a friend of mine. The tolerance between min and max thickness was only 1.6mm on the front rotors! That's tight.

I upgraded from solid rotors in my '80 rabbit to vented from a scirroco and the braking is fantastic! I seems that I don't have to press the pedal as far and the brakes stop me like a champ. I too have stomped down a bit with my vented rotors and boy do I stop quick now!

The best and most economical upgrade is using the 9.4 inch vented rotors from the '83 & '84 GTI's. With new 9.4 inch vented rotors and the right performance pads, you will have much better braking capacity without having to swap master cylinders and proportional rear valves.

Stopping is sharp and sudden, with a seemingly discordant combo of 13-inch discs up front and 10-inch discs in the rear.

I'll put it to you this way, you will need brakes when you are done with the track session. I warped several sets of rotors on my old 2.0 Golf during track days.