GM car with factory disc spindles?
Wilwood 140-12836-D has black six-piston Dynapro 6 calipers and 12.19-inch drilled and slotted rotors. It's built for the listed GM factory-disc spindles with original 11-inch rotors. A different spindle needs a different kit.
Match the application
Manufacturer-listed applications include 1979–81 Camaro/Firebird and specific later GM passenger-car rows. The exact year, model and original 11-inch-rotor spindle must match the manufacturer table. Drum spindles, 12-inch-rotor spindles and arbitrary aftermarket spindles are not covered by that listing.
What comes in the kit
Black powder-coated Dynapro 6 six-piston calipers, 12.19 x 0.81-inch iron SRP drilled/slotted rotors with black electrocoat, and a BP-10 pad axle set.
The hub kit includes the listed hubs, rotor adapters, mounting brackets, bearing cones, grease seals, spindle washers, dust caps/O-rings, wheel studs and assembly/shim hardware. Check the actual box against the instruction-sheet parts list; caliper/rotor finish options are not all included at once.
Hubs provide 5 x 4.50-inch and 5 x 4.75-inch bolt circles with 1/2-20 studs. Choose the pattern that matches the wheels.
Before it leaves the bench
Original spindle modification is required. DS-945 specifies removing the OE caliper-mounting ears and drilling/tapping/countersinking the prescribed mounting locations. Have a qualified machinist follow the actual figures; this is not a no-machining bolt-on conversion.
The hub offset moves each wheel 0.10 inch inward. Recheck tire/fender clearance and wheel position on both sides.
Some 15-inch wheels may fit, but diameter alone is insufficient. Use the exact wheel-clearance template and maintain at least 0.080 inch between wheel and caliper everywhere.
Wheel contact surfaces must seat completely on the hub face. Overhanging contact surfaces require separate 300-11961 steel spacers (6.60-inch diameter x 0.20-inch thick). For stamped-steel wheels without overhang, Wilwood recommends separate 300-10716 hub shields (6.15-inch diameter x 0.09-inch thick).
Flexlines are not included and OEM lines will not adapt to these calipers. Wilwood lists separate front line kit 220-10509; verify routing and suspension/steering clearance. Retain suitable OE spindle nuts/nut locks and supply new spindle cotter pins, which are not included.
Check bracket/caliper alignment, full bolt engagement through clinch nuts, bearing adjustment and wheel seating. Have an experienced brake installer confirm the master-cylinder/brake-bias combination, then bleed, bed and test the system before road use. These are traditional non-ABS spindle applications; ABS compatibility is not asserted.
Exact vehicle and spindle application table
Assembly instructions and wheel-clearance template
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