Wilwood D52 Rear Caliper Kits - Manual (Page 4)

suspension, brake or wheel components. NOTE: Wilwood hose kits are designed for use in many different vehicle applications and
it is the installer's responsibility to properly route and ensure adequate clearance and retention for brake hose components. Wilwood
offers universal brake flex line hose kits, order P/N 220-11371 for the 14 inch length, P/N 220-11372 for the 16 inch length, or P/N 220-
11373 for the 18 inch length. Hose kits include hoses, fittings, banjo bolts, etc. all in one package for use with this caliper.
•NOTE: Specified brake hose kits may not work with all Years, Makes and Models of vehicle that this caliper kit is applicable to due to
possible OEM manufacturing changes during a production vehicle's life. It is the installer's responsibility to ensure that all fittings and
hoses are the correct size and length to ensure proper sealing and that they will not be subject to crimping, strain and abrasion from
vibration or interference with suspension components, brake rotor or wheel.
•If using a Wilwood flexline hose kit, torque banjo bolt to 15-25 ft-lbs. DO NOT exceed 25 ft-lbs.
•If reusing the OEM brake hoses, install new crush washers (not included) and torque banjo bolt to manufacturer’s specification.
•In absence of specific instructions for brake line routing, the installer must use his best professional judgment on correct routing and
retention of lines to ensure safe operation. Test vehicle brake system per the 'minimum test' procedure stated within this document
before driving. After road testing, inspect for leaks and interference. Initially after install and testing, perform frequent checks of the
vehicle brake system and lines before driving to confirm that there is no undue wear or interference not apparent from the initial test.
Afterwards, perform periodic inspections for function, leaks and wear in a interval relative to the usage of vehicle.
•Bleed the brake system, referring to the additional information and recommendations below for proper bleeding instructions. Check
system for leaks after bleeding.
•Install the wheel and torque the lugs nuts to manufacturer’s specifications.
Assembly Instructions (Continued)
Page 4
Additional Information and Recommendations
•Please read the following concerning balancing the brake bias on 4 wheel disc vehicles.
This General Motors rear 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. Repeat the procedure until all calipers in
the system are bled, ending with the caliper closest to the master cylinder. 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).
•If after following the instructions, you still have difficulty in assembling or bleeding your Wilwood disc brakes, consult your local chassis
builder or retailer where the kit was purchased for further assistance.