The Wilwood 120-13434-RD is a right-hand forged aluminum caliper from the Forged DynaPro 6A lug-mount line, finished in red powder coat. The manufacturer says it offers direct interchange with all 5.25" pattern lug mount DynaPro and Dynalite calipers, so it can replace an existing lug-mount caliper without changing bracket geometry. The manufacturer also lists stainless steel pistons in 1.62-inch and 1.12-inch diameters.
Choose this unit over a generic six-piston caliper when you need a known Wilwood lug-mount platform with a forged body and stainless pistons, which matters for repeated heat cycles on track days or in competition. Bleeding is the main DIY hurdle. Owners on user forums say the bleeder passages are small and fluid is hard to push through, and owners on user forums report that the manufacturer's guidance is to bleed only the upward-facing screws. Search terms that fit this part include "Wilwood DP6A 5.25 lug mount caliper," "six piston red right hand caliper 0.81 rotor," and "Dynapro 6 forged caliper 120-13434-RD."
The manufacturer states it is a direct interchange for 5.25" lug-mount DynaPro and Dynalite calipers. Confirm that your existing bracket and hub match that pattern before ordering.
Owners on user forums report that the manufacturer's instructions call for bleeding only the upward-facing screws, not the lower ones. Bleed from the furthest caliper to the closest, as is standard.
The manufacturer lists a 0.81-inch rotor width and a maximum rotor diameter of 13 inches.
Mounting a lug-mount caliper like this is a moderate DIY job: you will need a torque wrench, a bleeder wrench, and a way to bleed the system fully, such as a vacuum or pressure bleeder. Owners on user forums report that bleeding Wilwood calipers can be time-consuming, and that small bleeder passages can clog or hold trapped air. Check that the bleeder adapters are snug before you start, because one owner found that the adapters on a set of calipers had loosened. Steel bleed screws in aluminum bodies can seize or snap, so avoid overtightening and use penetrating oil if needed. Before fitting pads, a Wilwood technician reportedly advised using compressed air and small wooden blocks to push all the pistons out roughly evenly, which helps prevent one piston from being driven out too far.
