The Wilwood 140-9315-DR is a complete rear disc conversion built on the Forged Dynalite platform. It pairs four-piston forged billet aluminum calipers, finished in red powder coat, with a 12.19-inch drilled and slotted one-piece rotor and BP-10 pads. The manufacturer says the forged billet Dynalite calipers and high-friction pads are balanced for custom street/strip and show builds, and the kit's hidden internal-shoe parking brake is designed to hold the car statically. For a GM-style 12-bolt housing that needs a parking brake and a staggered shock layout, this is a turnkey alternative to rebuilding drum hardware, and the forged calipers are a durability step up from stock. Buyers searching for a 12 bolt rear disc brake kit, 2.75 offset rear disc conversion, or staggered shock rear brake kit will find this kit matches those requirements.
Fitment is narrow, so confirm your housing before ordering. The manufacturer specifies OE C-clip axles only and does not support special-end or C-clip eliminator conversions. Axle offset should fall within 2.75 to 2.81 inches, and the hats are drilled for 7/16", 1/2", and 12mm studs. The manufacturer lists a 15-inch minimum wheel and notes that some 15s may fit, so check the wheel clearance diagram before buying. Parking brake cable hardware is not included, so budget for a separate cable kit. Installation requires disc brake experience, jack stands, a careful offset measurement, and red Loctite on the caliper bolts. Owners on user forums generally report that the offset check is the step that causes the most trouble.
No. The manufacturer specifies that this kit is for OE C-clip axles only and does not support special-end or C-clip eliminator modifications. Confirm your axle type and axle offset before ordering.
No. The manufacturer states that its rear brake kits do not come with parking brake cable hardware or adapters. Per the manufacturer's assembly instructions for its Dynalite parking brake kits, a generic cable kit (part 330-9371) is offered separately for this application.
Per the manufacturer, the right-hand caliper mounts at the rear and the left-hand caliper mounts at the front on staggered shock rear ends.
The manufacturer says installation should be performed only by people experienced with disc brake systems. Support the vehicle on jack stands rather than a jack or hoist. Before assembly, verify the bearing outside diameter, the axle flange and bracket pattern, and the stud pattern. The manufacturer calls the offset measurement from the wheel side of the axle flange critical for rotor-to-caliper alignment, so it should match the kit's stated offset. If your axle studs are larger than 0.50", a machine shop may need to drill the hat. Apply red Loctite 271 to the caliper mounting bolts and safety wire them with 0.032" stainless wire. The manufacturer's assembly sheet for a sibling Dynalite Pro Series kit lists 30 ft-lb for these bolts, so confirm the value for this kit before torquing. Install the pads with the friction material facing the rotor and secure them with a cotter pin. OEM rubber brake hoses generally cannot be adapted to Wilwood calipers, so plan for steel fittings and braided line. Confirm what is in the box against the parts list before starting.
