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Harley-Davidson Brakes by Wilwood

Got questions on braking systems? Read our brake article and FAQ.

Wilwood's GP 300 and GP 310 motorcycle calipers have been designed and engineered for use on 1984-2003 Harley-Davidson® Motorcycles. Built around a 4-piston, high performance powerhouse, these billet aluminum calipers bring distinctive, bolt-on styling: Direct leg-mounted calipers are available for all single and dual disc models (except Springer and 4-speed FL models), as well as the 1983 XR 1000.

Rear calipers are available for all Softail
® , Dyna, and touring models, utilizing unique bracket designs that combine the right elements of strength and style.


 

The GP 300 and GP 310 calipers are available in polished or brilliant chrome finishes, with the added performance characteristics found in Wilwood's racing calipers: stainless steel pistons to reduce brake fade while resisting corrosion and high temperature piston seals for extended life, controlled retraction and drag free operation. Additional features include bright-finish bleed screws and hardware, exclusive pad anti-rattle clip, and brake pads designed to operate in the widest range of temperatures and environments, utilizing our industry leading stainless steel rotor compatible formulation.

GP 310 Front Motorcycle Caliper:

View Caliper

Description

Polished

Chrome

Front Left Hand Caliper (single) 1984-1999

120-7737-P

120-7737

Front Right Hand Caliper          1984-1999

120-7736-P

120-7736

Front Left Hand Caliper (single) 2000-Present

120-7739-P

120-7739

Front Right Hand Caliper          2000-Present

120-7738-P

120-7738

Optional Mounting Bolt Kit, P/N: 230-6330

Click here for more information and to purchase


GP 310 Rear Motorcycle Caliper:

View Caliper

Description Bracket Not Included

Polished

Chrome

Rear Right Hand Caliper (Std 3.50" Mount)

120-7740-P

120-7740

Rear Left Hand Caliper   (Std 3.50" Mount)*

120-7741-P

120-7741

Optional Mounting Bolt Kit, P/N: 230-4236
* Use with Dyna "Bottom" Bracket Kit

Click here for more information and to purchase


GP 310 Rear Motorcycle Caliper Brackets:

View Brackets

GP 310 Rear Bracket Description

Polished

Chrome

Softail® Bracket Kit                 1984-1999

250-8035-P

250-8035

Softail® Bracket Kit                 2000-Present

250-8036-P

250-8036

Dyna Bracket Kit                          1984-1999

250-8034-P

250-8034

Dyna Bracket Kit                          2000-Present

250-8033-P

250-8033

Dyna "Bottom" Bracket Kit   1984-1999

250-8252-P

250-8252

Cruiser Bracket Kit                 1984-1999

      Call for Availability

Cruiser Bracket Kit                 2000-Present

      Call for Availability

Optional Mounting Bolt Kit, P/N: 230-4236 is included with Brackets
*Locates caliper on the bottom side of the rotor, use with left hand GP 310 rear caliper.

Click here for more information and to purchase


GP 300 Front Motorcycle Caliper:

View Caliper

Description

Polished

Chrome

Front Left Hand Caliper (single) 1984-1999

120-3933-P

120-4243

Front Right Hand Caliper          1984-1999

120-3945-P

120-4242

Optional Mounting Bolt Kit, P/N: 230-4237

Click here for more information and to purchase


GP 300 Rear Motorcycle Caliper:

View Caliper

Description (Bracket Not Included)

Polished

Chrome

Rear Caliper

120-3935-P

120-4244

GP 300 Rear Bracket Description

Black

Softail® Bracket Kit   1984-1999

250-4235

Click here for more information and to purchase


Motorcycle Brake Fluid:

Harley Davidson® Motorcycles specifies use of DOT 5 Silicone brake fluid because of its minimized impact on painted surfaces. Wilwood disc brake calipers will work with either fluid, but never mix DOT 5 Silicone brake fluid with DOT 3 or 4 fluids.

Changing brake fluid on a regular basis is highly recommended and esily accomplished when changing brake calipers. DOT 3 and DOT 4 brake fluids are superior for general brake system use as well as high performance applications. For best results, Wilwood Engineering recommends the use of Hi-Temp 570 DOT 3 brake fluid (P/N 290-0632) or EXP 600 Plus DOT 4 brake fluid (P/N 290-6209).

GP 310 Front Caliper

GP 310 Rear Caliper


GP 310 Rear Caliper Softail Bracket

GP 300 Front Caliper

GP 300 Rear Caliper


GP 310 Rear Caliper Dyna Bracket