I have to replace the rotors on the back my 92, I've got a fourth gen rear. Does any one know where I can get a set of cross drilled for less than 105, that is the cheapest I have seen on the web. Oh and by the way it makes no sense to got to regular rotors an auto parts store especially since cross drilled rotors are about the same price(like twenty more)but if anyone can help me that would be great.

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1992 383 Z-28 w/SuperRam intake and ACCEL DFI, PA Racing K frame,SS hood,SS rims

 

Why do you want cross-drilled rotors?

 

Cross drilled rotors stop better I know that because I use them on my monte carlo, I am going with cross drilled up front soon and I want the look to match. Plus the the price difference so far between regular rotors is like twenty dollers so I figured I might as well go with cross drilled rotors.

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1992 383 Z-28 w/SuperRam intake and ACCEL DFI, PA Racing K frame,SS hood,SS rims

 

With the advancement of today's brake pads, cross drilled rotors are merely for cosmetics.

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1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

Well its mostly a show car so mostly it is for looks. but the basic principle No matter how good the brake pads cross drilled rotors should help you.

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1992 383 Z-28 w/SuperRam intake and ACCEL DFI, PA Racing K frame,SS hood,SS rims

 

Cross drilled rotors help by allowing the heat to dissipate alot faster, creating a fade free braking feel.

 

I thought that cross-drilled rotors were supposed to help the gasses that form under hard braking between the pads and rotor escape. However, these gasses are created only under extremely heavy braking and only with older organic brake pads. Thirdgens never had organic pads on them, only semi-metallic which aren't supposed to create those gasses.

 

Cross drilling was to let the pad gasses escape and prevent fading during racing conditions, but as mentioned modern pads don't have this problem. Some say that cross drilling actually hurts performance by reducing swept volume.

 

I thought brake fad comes from the brake set up getting hot under hard braking. And crossdrilling helped to cool the brake assembly.

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1992 383 Z-28 w/SuperRam intake and ACCEL DFI, PA Racing K frame,SS hood,SS rims

 

I don't think crossdrilling has any real effect with today's brake pads. They're probably mostly for looks and if you've got a car you want to look cool then go for it. I love the way they look. But I have heard that crossdrilling actually decreases the overall strength and rigidity of the rotor.

 

Yes, old pads used to start to "evaporate" when they got hot, this created a cushion of gas between the pad and the rotor. Cross-drilling gave this gas somewhere to go.