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Harley-Davidson Brakes by Wilwood

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

Wilwood's GP 300, GP 300RT, GP 310 and GP 340RT motorcycle calipers have been designed and engineered for use on 1984 and up 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 as well as the 1983 XR 1000.

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

The GP 300, GP 300RT and GP 340RT calipers are available in polished or brilliant chrome finishes and the GP 310 is also available in Red or Black finish, 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.

Stealth Braking System

GP 310 Front Motorcycle Caliper:		View Caliper
Description	Polished	Chrome	Red	Black
Front Left Hand Caliper (single) 1984-1999	120-7737-P	120-7737	120-7737-RD	120-7737-BK
Front Right Hand Caliper 1984-1999	120-7736-P	120-7736	120-7736-RD	120-7736-BK
Optional Mounting Bolt Kit, P/N: 230-4237
Front Left Hand Caliper (single) 2000-Present	120-7739-P	120-7739	120-7739-RD	120-7739-BK
Front Right Hand Caliper 2000-Present	120-7738-P	120-7738	120-7738-RD	120-7738-BK
Optional Mounting Bolt Kit, P/N: 230-6330
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GP 310 Rear Motorcycle Caliper:		View Caliper
Description Bracket Not Included	Polished	Chrome	Red	Black
Rear Right Hand Caliper (Std 3.50" Mount)	120-7740-P	120-7740	120-7740-RD	120-7740-BK
Rear Left Hand Caliper (Std 3.50" Mount)*	120-7741-P	120-7741	120-7741-RD	120-7741-BK
Rear Left Hand Caliper Sprocket Brake	120-10174-P	120-10174	120-10174-RD	120-10174-BK
Rear Right Hand Caliper Sprocket Brake	120-10175-P	120-10175	120-10175-RD	120-10175-BK
Optional Mounting Bolt Kit, P/N: 230-4236 * Use with Dyna "Bottom" Bracket Kit 250-8252
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GP 310 - GP300RT - GP340 Rear Motorcycle Caliper Brackets:		View Brackets	GP300 Only
Description	Polished	Chrome	Black
Softail^®Bracket Kit 1984-1999	250-8035-P	250-8035	250-4235
Softail^®Bracket Kit 2000-Present	250-8036-P	250-8036
Dyna Bracket Kit1984-1999	250-8034-P	250-8034
Dyna Bracket Kit2000-Present	250-8033-P	250-8033
Dyna "Bottom" Bracket Kit* 1984-1999	250-8252-P	250-8252
FLH/FLT Bracket Kit 2000-2006	250-10165-P	250-10165
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.
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GP 300 Front - Rear 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
Rear Caliper	120-3935-P	120-4244
Optional Mounting Bolt Kit, P/N: 230-4237
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GP 300 RT Front - Rear Motorcycle Caliper:		View Caliper
	Polish	Chrome
Front Right Hand Caliper 2000 Up	120-10369-P	120-10369
Front Left Hand Caliper 2000 Up	120-10370-P	120-10370
Rear Caliper 2000 Up	120-10001-P	120-10001
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GP 340 RT Front - Rear Motorcycle Caliper:		View Caliper
		Chrome
Front Right Hand Caliper 1984-99		120-10473
Front Left Hand Caliper 1984-99		120-10474
Front Right Hand Caliper 2000 Up		120-10099
Front Left Hand Caliper 2000 Up		120-10100
Rear Caliper 1984 Up		120-10101
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Harley Davidson Sprocket Brake Assemblies View Sproket Sets
	Chrome	Polished
48 Teeth Right	140-10178	140-10178P
48 Teeth Left	140-10722	140-10722P
51 Teeth Right	140-10181	140-10181P
51 Teeth Left	140-10723	140-10723P
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Harley Davidson Motor Cycle Rotors View Rotors
	Front Rotor	Rear Rotor
1984-99 Harley Davidson Polished Stainless Rotor	160-9913P	160-9914P
2000 Up Harley Davidson Polished Stainless Rotor	160-9913P	160-9913P
1984-99 Harley Davidson Satin Finish Rotor	160-10662	160-10663
2000 Up Harley Davidson Satin Finish Rotor	160-10664	160-10665
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Forward Control Master Cylinder		View Master

Foot Master Clinder Right Hand		260-10377
Foot Master Clinder Left Hand		260-10378
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GP Brake Pads		View Pads

GP300 - GP310 - GP340	BP-10	150-8733-2
Stealth 2 Pk	BP-10	150-10043-2
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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).