Wilwood Polished Dynalite Internal Brake Caliper, 4 Pistons with 1.62-Inch Bores

This Wilwood Forged Dynalite Internal is a 4-piston brake caliper with a polished finish for a nominally 0.81-inch-wide rotor. Its 5.25-inch lug mounting centers and 1.62-inch piston bores must match the brake assembly. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components, including calipers, rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

Technical Details

• Manufacturer part number: 120-13842-P
• Component: Wilwood Forged Dynalite Internal; one caliper
• Pad shape: Wilwood type 7112; compound selected separately
• Rotor width: 0.81-inch nominal; 0.75–0.83-inch permitted range
• Rotor diameter range: 10.00–13.06 inches
• Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
• Mount height: 2.03 inches
• Piston arrangement: 4 pistons; 1.62-inch bores; stainless steel
• Hydraulic piston area: 4.12 square inches, as specified by Wilwood
• Fluid inlet: 1/8-27 NPT
• Body and finish: Forged aluminum; Polish
• Dust boots: No

This four-piston Dynalite uses internal fluid transfer in a spacerless body. Its 5.25-inch mounting pattern is only one compatibility dimension: rotor position, body clearance and hydraulic area also need to agree.

Fitment & Compatibility

For a replacement, compare the entire caliper specification rather than the finish or logo. On an adapted system, establish rotor alignment and piston-area requirements before choosing the mounting bracket.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

For a brake system assembled from individual components, PMB Performance brings over 20 years of experience. Contact us with the rotor, caliper and bracket information so we can help check the combination.