Harddrive Rear Master Cylinder Assembly - OEM 42810-04b - Harley Sportster 2004-2006
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
Restore critical rear braking performance on your Sportster with this Harddrive rear master cylinder assembly. Designed as a direct OEM replacement, it brings back firm brake pedal feel and reliable stopping power for 2004-2006 XL models.
Why riders pick this
- Complete replacement for OEM rear master cylinder
- Restores rear brake pressure and pedal feel
- Direct fit for Harley Sportster 2004-2006
- Engineered to OEM specifications for reliability
- Easy installation in the stock mounting location
When your rear brake pedal feels soft, unresponsive, or begins to leak, it's often a sign that your master cylinder is failing. This Harddrive rear master cylinder is a complete, OEM-spec replacement for Harley-Davidson Sportster XL models from 2004-2006. It's engineered to mount in the stock location and provide reliable, consistent braking performance, ensuring you maintain full control of your ride.
Reliable Rear Braking
- Direct replacement for OEM 42810-04b master cylinder
- Restores firm brake pedal feel and stopping power
- Designed for 2004-2006 Harley-Davidson Sportster XL models
- Mounts directly in the stock location for straightforward installation
Essential for Sportster Safety and Performance
A fully functional rear brake is essential for both safety and precise control, especially in challenging riding conditions. This Harddrive master cylinder assembly is a robust solution to address brake fade or failure, ensuring your Sportster performs as it should. Remember to properly bleed your entire rear brake system after installation to remove any air and achieve optimal pressure.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 148205
- UPC: 191361165887
- Weight: 0.5157 lbs
- Country of Origin: China (Taiwan)
Common questions
Will this fit my Sportster model from 2003 or earlier?
No, this Harddrive rear master cylinder assembly is specifically designed for 2004-2006 Harley-Davidson Sportster XL models. Earlier Sportsters use different master cylinder designs.
Is this a rebuild kit or a complete master cylinder?
This is a complete rear master cylinder assembly, ready to install. It replaces your entire existing unit, rather than just rebuilding the internal components.
Do I need to bleed the brakes after installing this part?
Yes, absolutely. After installing any new brake component, you must thoroughly bleed the entire brake system to remove all air and ensure proper, safe braking function.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Brakes |
| SKU | 820-50604 |
| WEIGHT | 0.52 lb |
