To change the rear tire requires the following several steps including, removal of disc brake pads and compressing the brake caliper piston inward, removing the axle and drive belt also required . After completion of the Disassembly and then reassembly of components including brake pads.The rear brake master cylinder failed, to function, no hydraulic pressure was supplied to activate the brake caliper. I believe when compressing the caliper piston inward (which is a common and necessary practice) caused the master cylinder to fail. Researching this issue I found that this is a common failure to 2004 - 2006 Harley Sportster motorcycles.
- NHTSA ID
- 11663578
- Incident
- May 28, 2025