The Stovebolt Site Forums The Shop Area General Truck Talk 15x8 Rally wheels

Performanceonline.com has 11" and 12" rotor kits for 47-59 chevy straight axles. Anyone put a 12 inch rotor inside these wheels? 11" I know will fit. These stock Corvette Rally wheels had factory 11+3/4" rotors. I wonder if they are calling them 12" and they are really 11+3/4"?

Well I answered my own question. I called a local business owner that works exclusively on Corvettes. He confirmed that the factory used the 11+3/4 rotors with these wheels. He also recommended that I, "stick with the 11" that way there is room for the caliper, and the 11's will stop just a good as the 12's". P.S. -The kit is also cheaper than the 12"s.

hey kent,
are you buying a complete brake kit from performanceonline, or just the rotors ?
i bought a complete power front disc brake conversion from them for my 57, and their customer service stunk.

in hind sight i would have bought just the booster and master and mounting bracket and bearing spacer from them,a nd gotten the rotors, calipers and pads from the local autozone.

i paid 100 bucks in shipping for the entire kit. but the rotors and calipers are standard 1970-1978 camaro.

got any pics of your truck ?

good luck with the install.

leonard

Ratrodking: No boosters for me. I already have the dual corvette master on the 52-1/2 ton with 10/10 residual valves and the drum/drum set-up. Been on 2000 miles now and stops good. However not being being able to leave anything alone this fall after I put it to sleep I thought I'd try and put on front disks. I have a 2 lb residual valve in the tool box and performanceonline seems to have reasonable priced kits with a choice of 11 or 12" rotors. $340 for the 11" and $50.00 shipping. Wheels are 15x8 5 on 4+3/4 Rally's. The advice I got locally from a long time Corvette repair shop owner was go with the 11"s vs 12. Thought I'd get the kit without the power booster, I don't use it now and it stops fine. I thought about just getting the plate, bearings, and new brake lines and buying the the camaro caliper packs locally. Good question got me thinking now. No pictures don't know how.

Someting you need to keep in mind, Bendix drum brakes are self energizing, meaning that the brakes use the vehicle continued motion to wedge the shoes tighter to the drums, effectively increasing the braking power. You will not have this with disk brakes. As a brake mechanic, I stongly suggest adding a power booster along with the disk conversion. No power is ok for a relatively light vehicle, like an MG or a compact car like a Chevette, but the extra boost is really needed with someting as heavy as a truck. I drove a Dodge Warlock that had manual disks on it once, it wouldn't hardly stop, even at low speeds.