Performance Machine 4-Piston 125x4R Rear Brake Caliper for 1984-2006 Harley-Davidson
Drop this caliper into a build and the difference shows up immediately — braking feels deliberate, progressive, and completely in command, whether threading through traffic or scrubbing speed before a long sweeper. It is the kind of upgrade that raises rider confidence without changing the lines or the look of a bike that has been built exactly the way it should be.
Key Features
- Four-piston dual-action design engineered for positive, consistent stopping power
- CNC-machined from 6061 billet aluminum for rigidity, reduced weight, and long-term durability
- Subjected to rigorous testing on the Performance Machine brake dyno prior to shipment
- Three finish options available — Polished, Chrome, and Black Contrast Cut — to complement any custom build aesthetic
- Black Contrast Cut process: caliper is polished, black anodized, then recut to expose the raw machined aluminum through the finish
- Includes brake pads, bleeder screw, and 3/8-24 banjo bolt with crush washers for a complete installation package
- Suitable for custom choppers and bobbers in addition to the listed Harley-Davidson platform applications
- Mounting bracket sold separately
- Made in the U.S.A.
Technical Specifications
- Design: Four-piston dual-action
- Compatible Rotor Diameter: 11.5″
- Maximum Disc Width: 0.20″
- Caliper Bolt Spacing: 3.5″
- Banjo Bolt Thread: 3/8-24
- Material: 6061 billet aluminum
- Available Finishes: Polished, Chrome, Black Contrast Cut
- Included Hardware: Brake pads, bleeder screw, 3/8-24 banjo bolt, crush washers
- Country of Origin: U.S.A.
Fitment Notes
- Compatible with select 1984–2006 Harley-Davidson Softail, Dyna, Sportster, and FXR models as listed in the fitment table
- Also suitable for custom choppers and bobbers requiring a universal four-piston rear brake caliper
- Maximum disc width is 0.20″ — this caliper is not compatible with sprocket brake setups, which use a 0.35″ rotor
- Rotor diameter must be 11.5″ — verify against existing brake setup before ordering
- Mounting bracket is not included; a separate bracket must be purchased for most installation applications
- Review the Fitment tab for the complete year and model breakdown
John S. –
Awesome caliper! The finish is amazing too!
Nick L. –
Great product
PHILIP BROOKS –
Looks great and came with necessary shims.
Jason Price –
Great parts
Nancy Price –
Excellent caliper!
Set L. –
Best calipers out there. Easily replaced my GMA type A calipers. Bolted right on and used the shims it came with to line up.
michael wilson –
Absolutely fantastic service, reached across Trumps ocean in 48hr from placing my order and less tariff that we get charged from Germany, God bless Scotland and America 👍anything I need I’ll be checking your website first
Christopher Y. –
Great quality and price!
Dave Goodwin –
Would definitely purchase from them again. Very competitive pricing.
Paul Grabowski –
Have not installed yet but looks good
Beau Thomason –
Item brand new is awesome
Anthony Araiza –
Thank got it in short time!