Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The Dynalite Single IIIA is a compact opposed-piston brake caliper with two 1.75-inch pistons. This anodized version uses a cast aluminum body and a 3.75-inch lug mounting pattern. The series name should not be mistaken for piston count, and its 0.25-inch nominal rotor opening must match the receiving brake package. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components, from calipers and brake rotors to master cylinders, valves, fittings and brake lines, for motorsport, street-performance and specialized applications; selection depends on the complete brake system.
Technical Details
- Manufacturer part number: 120-3842
- Caliper type: Dynalite Single IIIA
- Construction: Cast Aluminium
- Finish: Type III Anodize
- Piston bores: 1.75 inches
- Piston type: Stainless
- Piston count: 2
- Published piston area: 2.40 square inches
- Dust boots: No
- Nominal rotor width: 0.25 inch
- Rotor thickness limits: 0.18–0.25 inches
- Rotor diameter limits: 6.00–13.00 inches
- Mounting style: Lug
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 3.75 inches
- Mounting-hole size: 0.39 inch
- Mount height: 1.92 inch
- Hydraulic inlet thread: 3/8-24
- Required pad shape: 6812 / 7012
- Published pad area: 3 square inches
- Published pad volume: 1.1 cubic inches
- Manufacturer-listed component weight: 2.0 lb
Fitment & Compatibility
Confirm the mounting ears, 1.92-inch mount height and rotor centerline against the original installation. The 3/8-24 inlet is a thread specification, so select a fitting of the correct type rather than treating it as a bore dimension. Check the pad shape, wheel envelope and the stated rotor diameter and thickness limits before installation.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
