Wilwood presents this DynaPro lug-mount caliper as the newest generation meant to upgrade or replace the older Dynalite series, and this 120-9695 build is a forged billet aluminum body with four stainless pistons, each 1.75 inches. The DynaPro Lug Mount (DP) forged billet caliper represents the newest generation of calipers available as an upgrade or replacement for applications previously using the long-standing Dynalite model series. Piston Count 4, Piston Type Stainless, Piston Area 4.80 sq in. Its black finish is the manufacturer's listing for this part number.
The reason to pay for this unit over a stock or cheaper caliper is serviceability in tight packaging. The manufacturer says the calipers feature Quick-E-Clip pad retainers that support a 7812 type brake pad from the top. The bottom pad supports were removed, giving a slimmer profile that can be more easily fitted into tight clearance applications. Wilwood lists its driving environments as open-wheel sprint and midget, dirt or pavement, off-road, and industrial use, all at medium duty. Owners on user forums note that a lug-mount caliper is accessed from the back, which makes bolting it up more tedious than a radial design. Search terms this part targets include 5.25 lug mount 4-piston billet caliper, 1.75 piston 7812 pad caliper, and 0.38 rotor width sprint caliper.
The manufacturer lists a 7812 type brake pad, which is loaded from the top through the Quick-E-Clip retainers.
The manufacturer's install sheets state that rubber brake hoses generally cannot be adapted to Wilwood calipers, so plan on a steel-braided line and the adapter fittings listed for your setup.
The manufacturer's Dynapro install sheets say the work should be done by someone experienced with brake systems, so this is best suited to a builder comfortable with spindle and bracket work. The caliper bolts to a separate mounting bracket, and the manufacturer's procedure uses thin shims between the caliper and bracket so the rotor sits centered in the caliper, with pads checked to sit flush with the rotor's outer edge. Lightly lubricate the mounting studs, and plan to bleed the caliper farthest from the master cylinder first, per the manufacturer's bleeding guidance. Check wheel clearance before fitting wheels, and keep brake fluid off pad and rotor faces.
