Performance Machine 0053-3904 Caliper Rebuild Kit for 137x4 Integrated Softail Calipers

The Performance Machine 0053-3904 Caliper Rebuild Kit is specifically designed for rebuilding Performance Machine 137x4 four-piston integrated rear Softail brake calipers. This essential maintenance kit includes all the necessary rubber seals and components required to restore your caliper to optimal performance.

Key Features:

• Complete rebuild kit with all rubber seals and components
• Designed for Performance Machine 137x4 differential bore four-piston integrated calipers
• Compatible with caliper part numbers 243-127, 243-128, and 243-129
• For pre-2008 integrated Softail calipers with differential bore design
• Proudly made in the USA by Performance Machine

Important Compatibility Note: This rebuild kit is designed for pre-2008 integrated Softail calipers featuring differential bore pistons. It will not fit 2008 and later integrated calipers, which use symmetrical bore design and require rebuild kit 0052-3002. The differential bore design applies different forces at the leading and trailing edges of the brake pads for superior braking performance and reduced pad wear.

Regular caliper maintenance with genuine Performance Machine rebuild kits ensures consistent brake performance and extends the service life of your brake system.