1st gen camaro proportioning valve with Wilwood 4 piston calipers

[brycedrue]

I just bought a Wilwood brake kit 140-10996 11" rotors and 4 piston calipers. Can I use my factory style disc/drum proportioning valve with this kit?

[Apogee]

I just bought a Wilwood brake kit 140-10996 11" rotors and 4 piston calipers. Can I use my factory style disc/drum proportioning valve with this kit?

When you say "factory style disc/drum proportioning valve", what exactly do you mean? Original components from a first-gen F-body or later GM OEM parts from other applications?

What are you replacing, the factory D52 single-piston (6.7 in^2) brake kit with 11x1" rotor? Other than reducing your master cylinder bore size to account for the 30% reduction in caliper piston area, the rest of the hydraulic components could be fine assuming you're sticking with disc/drum and there's nothing inherently wrong with the system now.

Post up more details about what it is you have, as that would make this a little less hide-n-seek with the question and the answer, and more definitive.

Tobin
KORE3

[brycedrue]

I'm referring to the gm brass proportioning valve http://www.summitracing.com/parts/clp-pv-2/overview booster and master combo 1.125 bore http://www.summitracing.com/parts/rsd-g100309

These are installed now on the vehicle.
The car now has manual drums all 4 corners that I am trying to convert to power disc on the front only.
I have the oem style disc brake calipers and rotors laying in the garage but found the wilwoods for a good deal.

[Apogee]

To answer your original question, yes, you can use a 71-77 GM OE-style disc/drum combination valve with your Wilwood or OE front disc and factory rear drum brakes. You may find that you want to run a smaller bore MC with the Wilwood front discs due to the smaller piston area relative to the D52 calipers. That said, the brakes should work as you have them set up currently, but I would expect a relatively high and hard pedal with low brake torque, especially if you're not making great vacuum levels at idle.

[brycedrue]

Ok thanks, I noticed you mentioned something about caliper piston area. Will this reduced brake effectiveness? Are the wilwoods actually an upgrade compared to the D52 calipers?

[Apogee]

Ok thanks, I noticed you mentioned something about caliper piston area. Will this reduced brake effectiveness? Are the wilwoods actually an upgrade compared to the D52 calipers?

It really depends on your usage for the car and how you define "upgrade". The Wilwood kit noted, 140-10996, is a 4-piston Dynalite kit with 11" diameter x .81" thick rotors, and is designed around easily fitting inside a 15" wheel. The factory disc brakes use 11" diameter x 1" thick rotors and have a little more thermal mass, but also a cast iron hub/rotor and caliper, making it substantially heavier. You can get good performance out of each, however they do have different hydraulic requirements due to the difference in caliper piston areas. Set up properly, either can be made to work reasonably well.