Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

C4 Front Disc Rotors - What type ?

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Vettech:
Was wondering about smallish upgrades when things wear out, for instance, disc rotors.
I see adds for Plain OEM types, T2 and T3, drilled, slotted etc etc. I cant see a definative explanation of the difference of T2 to T3 etc.

Has anyone ventured down this path, what type did you use, and was there a Results  to $'s spent ratio of satisfaction.

I know one member has Willwoods or other on a C3, but has he gone over the top with mods to achieve what outcome.
I know my 78 went from catastrophic to great after the Calipers were machined, S/S sleeved, "O ringed" etc etc (it actually stopped then)

I only wonder because the wifes  car stops on a dime, I wont mention the car. I'd like the C4 to stop like this.
C4's have vastly better std brakes than previous Vettes.

Regards.

sabre:
Fitted 96 GS HD option to mine. Changes from 12" to 13" dia and 20mm to 28mm thick. Bolts on. Uses same pads. Bought DBA straight slotted (not drilled) rotors. Went from mediocre to excellent. Reduced pedal pressure and no fade. Good luck getting the calipers. They all want HD exchange.
Calipers cost me $500 and discs were about $220 from memory (which is failing). Suggest new braided hoses are a good idea too.

MY081:
I disagree Uncle Doug . C3s have 4 spot calipers and C$ have 2 spot ( I think ) Also slotted are best drilled tend to crack ( with hard work ) Also I am pretty shore the calipers on the C4 were designed and built in australia and there should be a holden equivalent . Also C3 s have 12  inch rotors ( just a tad under 12 ) In my opinion you can't go over the top with brakes Uncle Doug . Ray

sabre:
Not getting into which is better but it depends what you define as "spot". C3 has 4 piston fixed calipers while C4 has 2 piston (on inside) floating calipers. True 4 spot have will have either 4 either side (fixed) or 4 on one side (floating).
You are correct about manufacture. The C4 and C5 (I believe) were made by Bendix Australia. Unfortunately GM have the company locked out with copyright so you can't purchase direct.
Re using Commodore parts, HSV use the same pads so there's a good range. The discs have a metric PCD and the centering hole is smaller on the Holden so they'd have to be machined. No point going down that road as the new discs are available locally (DBA) at the same price. I'm assuming no one is tight enough to use second hand discs.
As for the calipers, I'd be interested if any were interchangeable.

Vettech:
Yes I thought they were out of Bendix Aust.

And Ray you are correct, no good having all the power in the world, if you cant stop.

A long ago friend was in the Brakes game, he had a Bendix book with life size pictures, you put your pad over the pics and if they matched, he ordered that Bendix number, I'm sorry now that we lost touch.

No one has commented on the meaning of T2 or T3. !?!?!?

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