W4A Caliper – Part No: 120-13002-n
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W4A Radial Mount -Quick-Silver/ST
Prod #: 120-13002-N
Price: $728.99

W4A Radial Mount -Quick-Silver/ST - Product Summary

Piston Count 4
Piston Area (in²) 1.98
Piston Type Thermlock
Dust Boot No
Rotor Dimensions
Rotor Width(in) 1.25
Rotor Diameter(in) 15
Pad Dimensions
Pad Area (in²) 11.1
Pad Volume (in³) 5.2
Duty Rating & Material
Material Aluminum
Weight(Lbs) 7.6
Colors & Finish
Color Nickel
Finish Nickel Plate

Mount Center(in) 7.09
Mount Position
Mount Side Right Hand
Mount Type Radial
Product Documents
Product Data Sheet

Click To Download
Installation Instructions

120-13002-n - Product Description

W4A Radial Mount -Quick-Silver/ST

Quick-Silver / ST series W4AR/ST nickel plated forged billet calipers, with four Thermlock pistons, deliver championship proven performance with heavy duty stopping power and reliability for sustained high heat competition. W4AR/ST calipers incorporate race technology into a radial mount body design with widespread adaptability and an expanded rotor compatibility range from 12.19” to 15.00”, including track update options for all W4AR Big Brake kits. Thermlock pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Four high-temp race only brake pad compounds in the 6617 pad type allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications.

The W4A body is the product of FEA computer design and stress flow forging technology. FEA technology allows the designer to test the prototype in a computer environment to determine the optimal structural design within the dimensional parameters of the component. Stress flow forging produces a part with the internal grain structure of the metal aligned in the direction of the flow of the body contour. The results are a caliper with superior clamping efficiency and ultimate strength against fatigue, stresses, and distortion under load.

The performance of the W4A is enhanced with SRS bridge plates, snap-ring locked pad retainer pins, recessed two-piece bleed screw assemblies and dampen mounted fluid transfer tubes. SRS bridge plates eliminate all bridge wear caused by pad gouging. The spring-loaded action of the plates also eliminates pad rattle. Snap ring clips lock the pad pins in place to provide positive retention and allow easy service without caliper removal. The bleed screws are recess mounted for protection against impact and debris. The fluid tubes are dampen mounted to protect them from fatigue or damage from vibration or debris.

Product Specifications

Rotor Compatibility
Rotor Width(in) 1.25
Maximum Rotor Width(in) 1.28
Minimum Rotor Width(in) 1.1
Maximum Rotor Diameter(in) 15
Minimum Rotor Diameter(in) 12.19

Brake Pad Specifications
Brake Pad Type 1 6617
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 11.1
Total Pad Volume (in³) 5.2
Piston Specifications
Piston 1 Bore(in) 1.12
Piston 2 Bore(in 1.12
Piston 3 Bore(in)
Piston 4 Bore(in)
Total Piston Area (in²) 1.98

Mounting Specifications
Mount Type Radial
Mount Side Right Hand
Mount Center(in) 7.09
Mount Hole Size(in) 0.45
Mount Height(in) 2.09
Inlet Thread Size 1/8-27 NPT

Additional Notes

Parts & Accessories

O-Ring Kit 130-2579
Replacement Dust Boot N-A
Replacement Piston 1 200-7556
Replacement Piston 2 200-7556
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit -
Bridge Bolt Kit N-A
Wear Plate L/H 300-5876
Wear Plate R/H 300-5876
Pad Retainer 180-9232
Bleed Screw Kit 220-6069
Self Bleeder Tube N-A
Cross-Over Tube 190-11508

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