Wilwood's DP6A forged caliper, here in the -BK black finish, is a six-piston lug-mount unit with a 5.25-inch mount center. Its piston bores are 1.62, 1.38 and 1.38 inches, for a total piston area of 5.06 square inches, and the body is forged aluminum with stainless steel pistons. Compared with a stock single- or two-piston caliper, a six-piston design spreads clamping force across a larger pad area, which is why it suits track day, autocross and drag builds that need repeatable stops. The manufacturer also says it offers direct interchange with the 5.25 pattern lug mount DynaPro and Dynalite calipers, so existing Wilwood hardware can often be reused. Search terms that match this part include "Wilwood 120-13430-BK right hand 6 piston lug mount caliper," "5.25 mount DP6A caliper," and "forged Dynapro 6 upgrade for 13 inch rotor."
Confirm before ordering that your rotor is a 13-inch diameter unit: the manufacturer's spec listing gives rotor diameter at 13.00 inches and rotor width at 0.38 inches. The caliper is right-hand mount, so the left-side partner is the separate 120-13431 part. Owners on user forums report that the new pistons trap air, so expect to bleed the system more than once. Pad area is listed at 7.3 square inches, which helps when choosing a compound.
Per the manufacturer's listings, the base 120-13430 is Type III anodized, the -BK is black powder coat, and the -RD is red. All of these are right-hand units, and the left-hand version is 120-13431.
The manufacturer states it offers direct interchange with the 5.25 pattern lug mount DynaPro and Dynalite calipers. Confirm your existing bracket and rotor specifications before ordering.
The manufacturer lists the bleed screw kit (220-0627) and pad retainer (300-17719) as separate part numbers. Confirm with the manufacturer whether either is included with the caliper.
This is an intermediate job: you will mount a bracket to the spindle, fit the caliper and pads, and then bleed a hydraulic system. The manufacturer's DynaPro install sheets call for shims between caliper and bracket to align the pad with the rotor, and for the bracket to sit squarely against the spindle bosses. Use red Loctite 271 on fasteners as those sheets direct, and torque to the values listed on the install sheet supplied with your bracket, since torque specs vary between kits. Bench-bleed a new master cylinder before connecting it. If the master cylinder sits below the calipers, the manufacturer recommends an in-line residual pressure valve to stop fluid flowback. When bleeding, start with the caliper farthest from the master cylinder, bleed the outboard screw first, and use only the top bleed screws if the caliper has four. For fluid, the manufacturer recommends Hi-Temp 570 or EXP 600 Plus, and advises against DOT 5 silicone for racing. Bed in the pads after the system is bled and check for leaks.
