The goal for adjusting the prop valve is to achieve the most rear brake pressure that still prevents the rear brakes from locking up before the front brakes. This involves some amount of field testing, which must be done in a safe place away from all other traffic and large objects such as trees and guardrails so you can perform multiple and somewhat aggressive braking maneuvers with plenty of runoff space. Configure your car with at least half a tank of fuel and with the tires up to their rated pressures. The first step is to adjust the valve (usually counterclockwise but check with the manufacturer) to minimize the rear pressure. This may be more than necessary, but we need to achieve a safe starting point. Perform a mild braking test from 30 or 40 mph with sufficient brake effort to achieve impending front-brake lockup. The rear brakes should not have locked prematurely-before the front brakes. Turn in the valve two turns and perform the braking test again. Repeat the tests while increasing the rear brake pressure until the rear brakes lock up before the front brakes. At this point, return the adjustment to where the brakes did not lock up before the fronts. You will want to give the brakes a rest between these tests so as not to cook the pads or the fluid. As a final test, increase the speed to 60 mph and carefully perform a similar braking test. If the rear brakes lock before the fronts, immediately lift off the brake pedal. Adjust the prop valve to reduce the rear brake pressure. We mounted the prop valve next to the master cylinder, but we've also seen it located along the outside of the framerail directly below the driver's door to make minor changes easy -if you're into that kind of stuff. We mounted the prop valve next to the master cylinder, but we've also seen it located alon Keep in mind that any drastic changes to the vehicle's weight distribution, tire diameters, brake rotor diameter, or tire quality will affect the brake balance. Even the difference of a half a tank to a near-empty tank of fuel can make the difference between premature rear lockup and optimum performance. It's worth the effort to perform this test carefully to get maximum performance out of your brake system. Wilwood bedding procedure: 1) 8-10 stops from 30 mph to 15 mph 2) 8-10 stops from 45 mph to 30 mph 3) 8-10 stops from 55 mph to 25 mph 4) Moderate cruise rpm with minimal brake use 5) Park car until brake cools to ambient temperature DESCRIPTION PN SOURCE PRICE Amsoil DOT 3 , 12 ounces BF3 Amsoil $6.40 Front disc conversion CH24821 OPG 529.95 Dorman brake hose H73242 Rock Auto 7.54 each Raybestos brake rotor 5100R Rock Auto 49.79 each Wilwood D52CB caliper 120-10937-RD Summit Racing 164.99 each Wilwood BP-10, D52 pads 150-8939K Summit Racing 52.94 Wilwood master cylinder, 7/8-inch 260-9439 Summit Racing 199.95 Wilwood prop valve 260-8419 Summit Racing 41.94 Wilwood DOT 3, 12 ounces 290-0632 Summit Racing 9.95 Russell flexible brake lines 692080 Summit Racing 64.88 Dorman 7/16x20 banjo bolt 13935 Summit Racing 5.99 each SOURCES AMSOIL 925 Tower Ave. Superior WI 54880 800-777-8491 www.amsoil.com Wilwood Engineering 4700 Calle Bolero Camarillo CA 93012 805-388-1188 www.wilwood.com Summit Racing 800-230-3030 www.summitracing.com Rock Auto 6680 Odana Road Madison WI 53719 866-762-5288 www.rockauto.com « | 1 | 2 | 3 | View Full Article By Jeff Smith Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!