The Wilwood Forged Superlite 6 Radial Mount caliper, part 120-13237 (right-hand side), is a six-piston radial-mount caliper for big-brake front setups. The manufacturer lists it with staggered 1.62-inch and 1.12-inch piston bores and a total piston area of 4.04 square inches, in a forged aluminum body with a Type III anodized finish. Compared with a stock caliper, the main reasons to pay for it are the extra clamping area, stainless pistons, and a larger pad than the narrow Superlite version. Owners on user forums describe stock-style calipers as flimsy, with pads that can spread under vibration. Other owners report flex after heavy track use, so experiences vary and it is worth confirming the right model with Wilwood before ordering.
This is a wide-body Superlite caliper, not the Forged Narrow Superlite, so a search for "narrow" versions will lead to a different pad volume and piston layout. It is listed for a 0.81-inch rotor with a maximum rotor diameter of 14 inches and a 5.98-inch radial mount center. Before you order, check wheel clearance, bracket, and hat compatibility, because owners on user forums stress that kit pieces are often specified for one caliper width only. For the install, Wilwood's kit instructions say to center the caliper with shims, mount the largest pistons toward the rotor exit side, and secure the bracket bolts with red Loctite 271 once alignment is set. Keyword focus: Superlite 6 radial mount caliper, 0.81 rotor caliper, right-hand 6-piston big brake caliper, 7420 pad caliper.
No. The manufacturer lists 120-13237 as a Forged Superlite 6 Radial Mount caliper with a 4.9 cubic inch pad volume. The Forged Narrow Superlite 6 Radial Mount is listed with a 3.8 cubic inch pad volume and a different piston layout, so the two are not interchangeable.
The manufacturer lists a 0.81-inch rotor width for this caliper, with a maximum rotor diameter of 14 inches. The same caliper family also has a 1.25-inch rotor version, so confirm the rotor width before ordering.
The manufacturer's kit instructions state that OEM brake lines will not adapt to Wilwood calipers, so plan on Wilwood-compatible hard lines or flexible hoses.
Installation is best suited to someone comfortable with spindle, hub, and brake-bleeding work. Wilwood's kit instructions call for clean, dry threads on the bracket bolts, shim adjustment so the rotor sits centered in the caliper, and red Loctite 271 on the bracket bolts once alignment is confirmed. Torque specs vary by kit, so use the torque values from your kit's instructions rather than a generic figure. Remove the center bridge pad retainer bolt before fitting pads, with the friction material facing the rotor, and confirm the pad top is flush with the rotor's outside diameter. Owners on user forums report that the pistons are stiff to push back when swapping pads, so budget extra time for that step. Finish by bleeding the system and confirming the wheel spins freely with no rubbing.
