Wilwood W4A Big Brake Truck Rear Brake Kit - Manual (Page 3)

Parts List
General Information, Disassembly, and Assembly Instructions
• Installation of this kit should ONLY be performed by individuals experienced in the
installation and proper operation of disc brake systems. Prior to any attempt to install
this kit, please check the following to ensure a trouble free installation.
• Inspect the contents of this kit against the parts list to ensure that all components and
hardware are included.
• Make sure this is the correct kit to fit the exact make and model year of your axle. This
kit is designed for direct bolt-on installation to 1999 through present model year GM
Truck / SUV 1500 Series hubs.
• Verify your wheel clearance using Figure 2.
• Verify that the factory axle and stud pattern matches the stud hole pattern in the rotors
supplied with this kit. Axles that have been modified with different size studs or lug
patterns may require modifications to the rotor that must be performed by a qualified
machinist.
Disassembly
• Disassemble the original equipment rear brakes: Raise the rear wheels off the ground
and support the rear suspension according to the vehicle manufacturer’s instructions.
• Remove the wheel. Remove the two bolts from the backside of the upright that holds
the stock caliper mounting bracket and lift off the bracket and stock caliper as one unit.
You may have to unbolt the stock caliper from the caliper bracket before removal.
Then slide off the rotor.
• Clean, de-grease the stock hub while removing any nicks or burrs.
Assembly Instructions (numbers in parenthesis refer to the part list/diagram on the preceding page):
•The caliper mount bracket assembly (1) should be installed first with clean, dry threads on the mounting bolts. Install the bracket from
the inboard side by sliding the original OEM bolt through the bracket (1) and place a washer (2) between the bracket (1) and mounting
upright. The bracket must tighten squarely against the inboard side of the caliper mount bosses on the upright. Inspect for interference
from casting irregularities, machining ridges, burrs, etc. Use one thin shim (2) between the bracket and upright during initial trial fitting.
CENTER
LINE OF
WHEEL
.50 (12,7)
RADIUS
3.80 (96,5) .33 (8,4) .20 (5,1)
4.72
(119,9)
8.15
(207,0)
CALIPER
WILWOOD ROTOR
WHEEL MOUNT
SURFACE
NOTE: A MINIMUM OF .080” CLEARANCE MUST BE MAINTAINED
BETWEEN THE WHEEL AND CALIPER IN ALL AREAS
1.25 (31,8) ROTOR THICKNESS
3.09 (78,5)
CENTER REGISTRATION
Figure 2. Wheel Clearance Diagram
1
2
3
3A
4
5
6
7
7A
8
9
10
11
12
2
16
2
2
2
24
24
2
2
4
4
4
16
1
250-9889
240-8969
160-9787/88
160-9762/63
170-9890
240-11240
230-6738
120-11667/68-FS
120-11667/68-FSR
230-9182
240-11101
230-9080
240-3902
150-9488K Bracket, Caliper Mounting
Shim, .029 Thick
Rotor, SV-GT 1.25” X 14.25” Dia, 12 x 9.19” Bolt Circle (one each, right and left)
Rotor, SRP Drilled and Slotted (one each, right and left)
Hat, 6 x 5.50, 2.34 Offset, 12 x 9.19 Bolt Circle
Washer, .265 I.D. x.500 O.D. x .063 Thick
Bolt, 1/4-28 x .75 Long, 12 Point
Caliper, W4A (one each, right and left)
Caliper, W4A (one each, right and left), Red
Nut, 7/16-20, Self-Locking, 12 Point
Washer, .453 I.D. x .750 O.D. x .063 Thick
Stud, 7/16-14 x 7/16-20 x 3.375 long (pre installed in bracket)
Shim, .016 Thick
Pad, BP-10, Axle Set
ITEM NO. PART NO. DESCRIPTION QTY
NOTES: Part Number 230-8217 Rotor Bolt Kit, includes P/N 230-6738 and 240-11240
Part Number 250-9899 Caliper Bracket Kit, includes P/N 230-9080, 230-9182, 240-3902, 240-11101, 240-8969 & 250-9889
Item 3A is an optional item and is included with the “-D” kits. Add “-D” to end of part number when ordering
Item 7A is an optional item and is included with the “-R” kits. Add “-R” to end of part number when ordering
Wilwood offers an optional Braided Stainless Steel Hose Kit. Order part number 220-8999 (1999-2006), or part number
220-11196 (2007-2011) (neither line included in kit).
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