Wilwood W4A Big Brake Rear Parking Brake Kit - Manual (Page 5)

•Slide the rotor registration adapter (17) onto the axle register on the axle flange with the smaller O.D. facing toward the rotor/hat (2).
Align the correct hole pattern in the hat with the stud pattern on the axle flange. NOTE: Some OEM and aftermarket axles come
with stud sizes larger than 0.50” diameter. Verify stud size and have a qualified machine shop drill the hats to the correct size, if
necessary. Slide the hat/rotor assembly (2 and 3) over the wheel studs covering the bracket kit assembly (1) and against the axle flange
face. Check to be sure the hat seats squarely against the hub. Install three lug nuts (finger tighten) to keep the rotor/hat assembly in
place while continuing with the installation.
•NOTE: Please reference the caution statement at the beginning of the assembly instructions. The caliper mounting bracket assembly
(6) should be installed first with clean, dry threads on the mounting bolts (7). Install the bracket from the rear side of the bracket kit
assembly (1) by sliding bolt (7) through two flat washers (9), bracket (6), shim washer (10) and finally through the spacer (11), see
Figure 1. NOTE: End of bolt should not exceed inside face of insert. The bracket must tighten squarely against the back side of the
bracket kit assembly (1). Inspect for interference from casting irregularities, machining ridges, burrs, etc. Use one thin shim (10)
between the bracket (6) and spacer (11) during initial trial fitting.
• Lubricate caliper mounting studs and nuts with lightweight oil. Install one washer (16) over each pre-installed stud (15) on the radial
mount bracket (6). Slide the caliper (12) in place over the studs and rotor, then install the washer (14) and lock nut (13) to hold the
caliper in place. The caliper bleed screws should be pointing up. Snug the lock nuts (13) and check that the rotor (3) is centered in the
caliper (12). Add or subtract .015" shims (10) as necessary between the caliper mounting bracket (6) and the spacer (11) to center the
caliper (12).
•Remove the two caliper pad retaining pins from the caliper (12) by popping out the pin retaining clips and sliding out the pins. Slide the
brake pads (8) into place. They should install easily without interference. Check that the outside radius of the brake pad is flush with
the outside diameter of the rotor face. Add or subtract shims (16) between the caliper (12) and mount bracket (6) to gain the proper
alignment. Reinstall the pad retainer pins and secure using the pin retaining clips.
•Adjust the parking brake shoes outward (using a drum shoe adjustment tool available at your local auto parts store) while spinning the
hat (2) until a slight drag is felt against the hat/drum. Remove the lug nuts that were holding the hat/rotor in place. Install the wheel
and lug nuts. Check to see that the wheel rotates freely without interference.
•Once all clearances have been checked, remove the wheel, caliper, hat/rotor from the bracket kit assembly (1). Secure the caliper
mounting bracket (6) to the bracket kit assembly (1) using red Loctite ® 271. Torque bolts (7) to 180 in-lb. Reinstall the hat/rotor
assembly and again use lug nuts to hold it in place. Reinstall the caliper, torque the caliper nuts (13) to 47 ft-lb.
•NOTE: Clevis and cable kits which attach to the parking brake assembly are not included in the Wilwood parking brake kit. Wilwood
offers a generic style parking brake cable kit, P/N 330-9371 for this application which can be ordered separately from your local Wilwood
dealer or by calling Wilwood customer service at (805) 388-1188.
•NOTE: OEM rubber brake hoses generally cannot be adapted to Wilwood calipers. The caliper inlet fitting is a 1/8-27 NPT. The preferred
method is to use steel adapter fittings at the caliper, either straight, 45 or 90 degree and enough steel braided line to allow for full
suspension travel and turning radius, lock to lock. Carefully route lines to prevent contact with moving suspension, brake or wheel
components. 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.
•Specified brake hose kits may not work with all Years, Makes and Models of vehicle that this brake 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.
•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.
•Repeat this entire procedure for the other wheel.
Assembly Instructions (Continued)
Page 5