Wilwood W6A Big Brake Truck Front Brake Kit - Manual (Page 5)

Additional Information and Recommendations
•NOTE: With the installation of after market disc brakes, the wheel track may change depending on the application. Check your wheel
offset before final assembly.
•Please read the following concerning balancing the brake bias on 4 wheel disc vehicles.
This GM Truck kit can be operated using the stock OEM master cylinder. However, as with most suspension and tire modifications
(from OEM specifications), changing the brakes may alter the front to rear brake bias. Rear brakes should not lock up before the
front. Brake system evaluation and tests should be performed by persons experienced in the installation and proper operation of
brake systems. Evaluation and tests should be performed under controlled conditions. Start by making several stops from
low speeds then gradually work up to higher speeds. Always utilize safety restraint systems while operating vehicle.
•For optimum performance, fill and bleed the new system with Wilwood Hi-Temp° 570 grade fluid or EXP 600 Plus. For severe braking
or sustained high heat operation, use Wilwood EXP 600 Plus Racing Brake Fluid. Used fluid must be completely flushed from the
system to prevent contamination. NOTE: Silicone DOT 5 brake fluid is NOT recommended for racing or performance driving.
•To properly bleed the brake system, begin with the caliper farthest from the master cylinder. Bleed the outboard bleed screw first, then
the inboard. Repeat the procedure until all calipers in the system are bled, ending with the caliper closest to the master cylinder. If the
caliper is fitted with bleed screws on four corners, make sure the bottom bleed screws are tight. Only bleed from the top bleed screws.
NOTE: When using a new master cylinder, it is important to bench bleed the master cylinder first.
•Test the brake pedal. It should be firm, not spongy, and stop at least 1 inch from the floor under heavy load.
If the brake pedal is spongy, bleed the system again.
If the brake pedal is initially firm, but then sinks to the floor, check the system for leaks. Correct the leaks (if applicable) and then
bleed the system again.
If the brake pedal goes to the floor and continued bleeding of the system does not correct the problem, either air may be trapped
in the system, or a master cylinder with increased capacity (larger bore diameter) may be required. Wilwood offers various
lightweight master cylinders with large fluid displacement capacities (custom fabricated mounting may be required).
Page 5
•Repeat this entire procedure for the other wheel.
• Bleed the brake system. Reference the general information and recommendations below for proper bleeding instructions.
• Remove the lug nuts that were used to hold the hat/rotor assembly in place during caliper installation. Install the wheel and torque the
lug nuts to OEM specifications.
Assembly Instructions (Continued)