The Wilwood DPR-DS in black is a four-piston, radial-mount caliper from the Dynapro line, aimed at drivers who want a brake upgrade with a slim profile and dust-protected pistons. The Dynapro-DS combines the versatility of radial mounting with a sleek profile, superior strength, and extreme durability in adverse conditions. The part number's designation calls for 1.25 inch pistons and .38/.500 inch rotors. Its pistons are stainless steel and the black finish is a powder coat. Dust wiper seals are the main reason to choose this version over an open-piston caliper, because they let it run where track or road debris and environmental sealing matter. For autocross, rallies, and off-road builds, that protection helps the pistons stay clean and move freely over time.
Compared with a standard unsealed caliper, the DPR-DS gives you a sealed piston area and a radial mount that makes rotor and pad changes simpler to plan. The addition of dust wiper seals allows this caliper to be used in localities that require a method of environmental sealing. Radial mounting is a different bracket design from lug-mount calipers, so budget for a radial bracket that matches your hub and spindle. A radial caliper would require a completely different bracket, so there would be some custom work involved, either DIY or asking the manufacturer to design one. Long-tail searches for this part usually include terms like 1.25 inch piston radial mount dust seal caliper, black Dynapro four-piston caliper, and .38 rotor dust boot brake caliper.
The manufacturer lists the same Dynapro dust seal radial mount design in a Type III anodize finish under a separate item number, while the -BK version is a black powder coat.
The manufacturer lists a 5.98 inch radial mount. Owners on user forums note that radial-mount Wilwood calipers need a bracket different from lug-mount designs, so confirm bracket compatibility with the manufacturer before ordering.
This is a moderate-difficulty job for an experienced home mechanic, and it involves hub-side work and brake hydraulics. Wilwood's kit assembly sheets recommend making sure the rotor sits centered in the caliper and adjusting with shims if it does not. The largest pistons should face the rotor exit end of the caliper. Pads go into the caliper, and pad height can be adjusted by adding or subtracting shims between the caliper and bracket. Those sheets list a caliper lock nut torque of 30 ft-lb, but that figure comes from kit instructions, so confirm the correct spec for your bracket with the manufacturer. Use steel fittings for the caliper inlet, which the sheets describe as a 1/8-27 NPT thread, and the preferred method is to use steel adapter fittings at the caliper, either straight, 45 or 90 degree, with PTFE tape on the pipe threads. Also note that OEM rubber brake hoses generally cannot be adapted to Wilwood calipers. Bleed the system after assembly.
