This left-hand Wilwood MC4 Mechanical parking brake caliper in black powder coat is built around a single 1.19-inch aluminum piston with 1.11 square inches of piston area, and the manufacturer describes it as a cable-operated unit for separate parking-brake duty on a 1.10-inch rotor. Its die-cast body and forged billet anvil are meant to hold up under load, and the piston is fully dust-booted to keep moisture and grit away from the bore. Compared with a bare parking-brake setup, the black high-temp, brake-fluid-resistant finish and the noise-dampening design help the unit stay quiet and rattle-free. Track and rear-brake builders searching for a left-hand 1.10 rotor parking caliper, a 4.75-inch floating mount, or a 1.19 piston MC4 caliper will find those specs matched here.
Fitment is set by rotor size and mount, not by a single vehicle listing, so confirm your rotor and bracket before ordering. The manufacturer's sheet lists rotor thickness from .310" to 1.10" and diameters from 11" to 14", with a 4.75" mount center. The lever takes a .310" barrel-ended parking cable, and the lever cartridge can be clocked in three positions to suit cable routing. Owners on user forums report that a factory cable's end fitting often will not seat in the MC4 without modification, so plan on a dedicated cable kit. Route the cable with gentle bends, since the manufacturer's cable instructions call for a minimum 6" bend radius, and pre-stretch and re-adjust the cable before the first use.
The manufacturer states the calipers are built to accept rotors from .310" to 1.10" thick by part number, in an 11.00" to 14.00" diameter range. Confirm the exact rotor specification for your application before ordering.
User forums report that the stock cable's end fitting often does not pass through the caliper hole and that the clevis may not seat in the lever without modification. Plan on a dedicated Wilwood parking brake cable kit.
Installation is a moderate DIY job that involves bracket mounting, caliper alignment, and cable routing. Per the manufacturer's bracket guidance for MC4 setups, the mount bracket is shimmed on the bolts so the rotor sits centered in the caliper, and the same shim count is kept on each bolt. Wilwood's cable instructions note that bends in the cable reduce pull force at the brake and that the cable must be restrained so it does not straighten under tension. Pre-stretch the cable, then re-adjust tension, and confirm the parking brake holds before driving. Confirm torque specs and the exact hardware list with the manufacturer, since those were not confirmed in this research.
