Wilwood Billet Superlite 4R Radial Mount - Manual

4700 Calle Bolero • Camarillo, CA 93012 Sales: 805 / 388-1188 • Fax: 805 / 388-4938 • www.wilwood.com
97 (12/01)
Caliper Highlights:
The Billet Superlite 4R/ST is an extremely rigid, four
piston, radial mount design that incorporates Wilwood’s
latest technology in brake system heat management.
With its small piston volumes and large pad capacity, it
is ideally suited for rear brake applications in severe
duty oval track and road course competition.
The BSL4R/ST body is a product of FEA design and
stress analysis technology. It is configured for use with 1.25"
thick rotors and the substantial pad volume of the 7420 style
brake pad. The fully CNC machined, two piece, billet body features a
closed bridge with grade 8 thru-bolts. It is the perfect balance between high
strength, low deflection, and overall lightweight. Each caliper is fitted with stainless steel
bridge plates to reduce wear and provide the smoothest pad operation. A center bridge bolt adds to overall caliper
strength and gives easy access to the top loaded pads.
Thermlock ® pistons are used to minimize the direct heat transfer from the brake pads. This configuration has been
documented to reduce caliper temperatures by more than 30% without the need for fluid recirculation systems. Fluid
temperatures are already reduced, seal life is extended, and caliper service life is prolonged with less distortion and
reduced wear in the piston bores. Cooler temperatures translate into maximum performance and ultimate reliability
over the longest run. Use EXP 600 Plus racing brake fluid to guarantee trouble free performance in all extreme
conditions.
BSLR bracket kits are used to install the BSLR4/ST calipers in place of most 3.5" tab mount calipers. Radial mounting
simplifies service in the field and the bracket kits provide two planes of adjustment for precise alignment over the disc.
2.43 (61,7)
.80
(20,3) 4.74 (120,4)
SUPERLITE 4R/ST CALIPER, TYPE 7420 PAD DIMENSIONS AND ORDERING INFORMATION:
BILLET SUPERLITE 4R/ ST CALIPER
AXLE SET PART NO. PAD TYPE/COMPOUND
15A - 5938K 7420 A PolyMatrix
15C - 6853K 7420 C PolyMatrix
15J - 6443K 7420 J PolyMatrix
BILLET SUPERLITE 4R/ST
DIFFERENTIAL BORE
FRONT MOUNT REAR MOUNT
PART NUMBER PART NUMBER
BORE SIZE DISC WIDTH RH LH RH LH
1.38/1.12” 44,5/28,4 mm 1.25” 31,8 mm 120-6541-FS 120-6542-FS 120-6541-RS 120-6542-RS
1.25/1.12” 31,8/28,4 mm 1.25” 31,8 mm 120-6543-FS 120-6544-FS 120-6543-RS 120-6544-RS
1.25/1.00” 31,8/25,4 mm 1.25” 31,8 mm 120-6545-FS 120-6546-FS 120-6545-RS 120-6546-RS
1.12/1.00” 28,4/25,4 mm 1.25” 31,8 mm 120-6547-FS 120-6548-FS 120-6547-RS 120-6548-RS
NON-DIFFERENTIAL BORE
BORE SIZE DISC WIDTH PART NUMBER
1.00” 25,4 mm 1.25” 31,8 mm 120-6549-L/R