2000 Golf GTI Brake Rotor Specs

Just as with any vehicle, when performing a brake job on a 2000 Volkswagen Golf GTI you must check the rotors for machining or reuse. Every manufacturer provides guidelines -- specifications -- for the dimensions of its cars' rotors. There are three main specifications that Volkswagen provides in regard to rotor dimensions: discard thickness, minimal machining and nominal thickness.
Discard Thickness
"Discard thickness" is the minimum thickness that the manufacturer recommends the rotor can be before it must be replaced. If the rotor falls below this specification, you must replace it to avoid damage to the braking system. The front rotors of the 2000 Golf GTI have a discard thickness of .394 inches with a solid rotor and .709 inches with a vented rotor. The rear rotors, for GTIs equipped with rear disk brakes, have a discard rating of .315 inches.
Minimal Machining Rating
The "minimal machining" rating is the measurement that determines if the rotor is eligible for resurfacing or machining. If the rotor's width falls below this number it is not recommended by the manufacturer to machine, or resurface, the rotor. The front rotors have a minimal machining rating of .866 inches with an FN3 caliper, and .748 inches with an FS II caliper.The rear rotors' minimal machining specification is .276 inches.
Nominal Thickness
The "nominal thickness" of a rotor is the thickness of the disk when it is new. The front rotors' nominal thickness on the 2000 Golf GTI is .472 inches for a solid rotor and .788 inches for a vented rotor. The rear rotors have a nominal thickness of .394 inches.