GMA Model B Calipers

Model B Calipers (2 Piston)

Compact and lightweight describes this modern design’s best features. Two 1-5/8″ centerless ground pistons hard anodized for long wear and performance. Top quality organic brake pads are featured on each caliper. Clear anodizing seals the aluminum housing for a long life and lasting luster. The proper bracket is included for each application.

A dramatic improvement over the original OEM brake. Fits front single disc FX and Sportster® models 1974 to early 1977. Contains all the necessary parts, including mounting hardware, spacers and bracket. Will require removal of the rotor from the hub and spacing the rotor for adequate caliper-to-spoke clearance. These spacers are included with the kit. A fitting is provided to adapt to the stock brake line.
Designed for wheels 19″ or smaller.
Kit requires a 5/8″ bore master cylinder.


Fits all models from late 1984 to 1999. New one piece design bolts directly to lower leg, eliminating the need for a bracket. Kit requires 5/8″ bore master cylinder for single disc and 3/4″ bore for dual disc. Will not fit Narrowglide 21″ wire wheel. This kit is designed to accept 10mm (3/8-24) banjo bolt.


A modified version of the GMA B caliper family is designed with the custom builder in mind. This is not a direct bolt-on kit. Removal of the original factory brake mounting tabs may be required. Converts OEM drum brake front end to 10″ dual discs. Bolt-on dual disc kit mounts to original fender mounts. All mounting hardware and brackets are included. Kit includes aluminum spacers for mounting either the narrow, custom after-market fender or the OEM 16″ fender. 16″ or 19″ wheels only. The kit requires 3/4″ bore master cylinder.


Front Single Disc, FXSTS 1988-1999
Fits Harley Davidson* FXSTS Springers. Uses factory axle anchor rod and bronze washers (not provided). Kit uses stock OEM master cylinder. Will not fit FLSTS (Oldboy).


This caliper kit is a direct bolt-on replacement which fits 1984-1986 Softail® frames. Includes all mounting hardware, spacers and bracket. The bracket is black anodized aluminum. Uses stock HD* brake line. Will accept stock OEM master cylinder.


This caliper kit is a direct bolt-on replacement which fits 1987 to 1999 Softail® frames. Includes a one-piece black anodized bracket, eliminating the need for spacers. Clean and simple. Uses stock HD* brake line. Will accept stock OEM master cylinder.

GMA-203, 204, 205

GMA-203, 204, 205
(Shown in Classic Black)


Each kit uses the same caliper and bracket. Correct brake line adapter fittings and axle spacers provided. All kits require a 5/8″ bore Master Cylinder.
GMA 203 Rear Kit for HD* Sportster 1979-1981
GMA 204 Rear Kit for HD* Sportster 1982-Early 1987
GMA 205 Rear Kit for HD* Sportster late 1987-1999

*The words Harley-Davidson or HD are not intended to imply that any of these products are HD original equipment or are sanctioned by the Harley-Davidson company. The words are only used to identify products and models.