Wilwood W4A Big Brake Front Brake Kit (Race) - Manual (Page 3)

General Information and Disassembly Instructions
Parts List
•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 and
wheels. This kit is designed for direct bolt-on installation to 1997 through current
model year Chevrolet C-5 and C-6 Corvette hubs, but requires minimum of 18”
diameter wheels. Check wheel clearance diagram.
•Verify your wheel clearance using Figure 2.
•Verify that the factory hub and stud pattern matches the stud hole pattern in the hats
supplied with this kit. Hubs that have been modified with different size studs or lug
patterns may require modifications to the hat that must be performed by a
qualified machinist.
•WARNING: Brake pads included in this kit are intended for high temperature race
use only. Extended use at low temperature can cause accelerated rotor and pad
wear. Please see the associated components list on the last page of this data sheet
for alternative brake pad compounds for other uses.
Disassembly
•Disassemble the original equipment front brakes: Raise the front wheels off the
ground and support the front suspension according to the vehicle
manufacturer’s instructions.
•Remove the wheel. Remove the two bolts from the backside of the spindle that hold the stock caliper mounting bracket and lift off the
bracket and stock caliper as one unit. If space is a problem, you may have to unbolt the stock caliper from the caliper bracket before
removal. Save the stock caliper mounting bracket bolts and washers, they will be utilized during reassembly, then slide off the stock
hat and rotor assembly.
•Clean and de-grease the spindles as well as the stock caliper bracket bolts. Inspect and remove all nicks, burrs, rust, or debris from
the hubs that would prevent the rotor hats from sitting squarely on the hub face.
CENTER
LINE OF
WHEEL
.50 (12,7)
RADIUS 1.57 (39,9)
3.80 (96,5) .20 (5,1)
4.61
(117,1)
8.05
(204,5)
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
2.78 (70,6)
CENTER REGISTRATION
Figure 2. Wheel Clearance Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
12
2
2
24
24
24
2
4
4
4
16
4
1
250-11721
240-8969
160-8398/99
170-11740
240-11240
230-6738
300-8429
120-11671/72-RS
230-9182
240-11101
230-9080
240-3902
300-10827
15H-9979K Bracket, Caliper Mounting
Washer, .562 I.D. x 1.121 O.D. x .029 Thick
Rotor, SV-GT 1.25” X 14.00” Dia, 12 x 8.75” Bolt Circle (one each, right and left)
Hat, Dynamic Mount 5 x 4.75, .290 Offset, 12 x 8.75 Bolt Circle
Washer, .265 I.D. x.500 O.D. x .063 Thick
Bolt, 1/4-20 x .75” Long, 12 Point
T-Nut, 1/4-28
Caliper, W4AR/ST (one each, right and left)
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)
Washer, .441 I.D. x 1.000 O.D. x .016 Thick
Spacer, .453 I.D. x 1.00 O.D. x .300 Long
Pad, PolyMatrix 15H Compound, 6617H, Axle Set
ITEM NO. PART NO. DESCRIPTION QTY
NOTES: Part Number 230-6656 Rotor Bolt Kit, includes part numbers 230-6738, 240-11240 and 300-8429
Part Number 250-11720 Caliper Mounting Bracket Kit, includes P/N 250-11721, 230-9080, 230-9182, 240-3902, 240-11101, 240-8969 & 300-10827
Wilwood offers an optional Braided Stainless Steel Hose Kit. Order part number 220-8176 (C-5) or 220-9100 (C-6) (not included in kit)
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