Wilwood Rear Four-Piston Low-Profile Brake Kit, Red, Plain 11.00-Inch Rotors, G-Body 2.62-Inch Offset

GM G-Body Axle Flange applications using the specified mounting arrangement can use this Wilwood Dynapro Low-Profile rear brake conversion. It combines red 4-piston calipers, pads and plain face 11.00-inch rotors, with the exact fitment qualifications set out below. Wilwood Engineering designs and manufactures disc-brake systems and components in Camarillo, California, where the company founded by Bill Wood in 1977 is based. Its range serves specialized applications, motorsport and street-performance vehicles, including calipers, brake rotors, master cylinders, valves, fittings and brake lines chosen to match a complete system.

Technical Details

• Manufacturer part number: 140-17120-R; supplied as an axle kit.
• Rotor specification: Material: Iron; Type: Ultralite HP 32 & Hat; Style: Plain Face; Surface Finish: Plain.
• Housing-flange requirement: G-Body flange; 2.62-inch axle offset, measured using the manufacturer worksheet.
• Rotor/hat mounting-hole pattern: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm; cataloged hole clearances 0.52 in; 13.21 mm. These are rotor or hat drillings, not replacement wheel studs. The retained hub or axle determines the vehicle wheel pattern.
• Brake rotor size: 11.00-inch outside diameter × 0.81-inch thickness; vented friction section.
• Machining prerequisite: Housing-flange material removal and two drilled holes required; follow the specific drawing and arrange qualified machine-shop work.
• Supplied friction pads: BP-10 compound; match operating conditions to the intended use.
• Hardware and retained components: Mounting hardware supplied; existing wheel hubs retained; spindles, master cylinder and brake booster are not included.
• Parking brake: Internal shoe parking brake supplied; cables, cable hardware and adapters are separate.
• Service calipers: Forged Dynapro Low Profile; 4 pistons per caliper; Red Powder Coat; lug mounting; stainless pistons.
• Hydraulic sizing: cataloged bore sizes 1.38, 1.38 inches; piston area 3.00 square inches; inlet 1/8-27 NPT.
• Wheel envelope: 14-inch minimum nominal wheel diameter; verify the entire wheel-clearance drawing, including spoke and barrel shape.
• Hydraulic lines: Hydraulic flexlines and fittings are not included; select compatible lines for the complete installation.

Fitment & Compatibility

Select this conversion by the GM G-Body housing-flange drawing and a measured 2.62-inch axle offset. DS1546 requires substantial housing-flange modification, including material removal and two drilled holes, preferably performed by a qualified machine shop. Check the axle-flange register, stud clearance and full 14-inch wheel drawing. Parking-brake cables, cable hardware and adapters are separate; plan the complete cable route before disassembly.

For help matching the brake hardware, contact PMB Performance with your VIN, photographs and measurements. Our team has over 20 years of experience with parts and fitment details.

Review Installation instructions, Technical bulletin for the complete installation and clearance requirements.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.