i have been told at the dealer that new thickness is approx 25 mm, and replacement size is 23 mm... VW recommends they be done together, but backyard experts & penny pinchers feel that it isn't necessary...... I would never take a chance for the $200 or so that rotors cost it just isn't worth it. if you can't afford $200 for the most critical safety system on your car, perhaps you should take the bus until you can... Very small diameter diferences cause degradation of brake performance, witness when the pads are half worn how low the fluid goes down....that is compensating for the pad wear and ROTOR wear as well......tires & brakes are all that saves your butt in the day-to-day world of insanity out there, don't be foolish.
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 have the cd zims and they don't make noise. these are the newer small holes version.
I had crossdrilled Zimmermans on my Golf...didn't notice any noise from them..but did notice faster pad wear ....
i have this setup actually.. on my 2.0. zimmerman crossdrilled and ebc greenstuff. the concensus is that for most city and highway driving, solid rotors are best, more braking surface = better stopping. however, my setup really BITES for 10.1" rotors... i just m ainly got the crossdrilleds for looks
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.
The OE rotors on the 993 twin-turbo were made by....(drum roll)..... Zimmermann. If that brand is good enough to stop a $100,000 supercar, my A2 should be child's play.
I just bought zimmerman cross-drilled rotors for the fronts. Cross-drilled rotors are lighter but do not dissipate heat better (less material to soak up heat). Stock or slotted rotors are best for soaking up heat.
The cause is Sub-Standard, Cheap "Made in China" Rotors.
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