All Balls Master Cylinder Rebuild Kit Front - 18-1137
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Product Information
Full details
The All Balls Master Cylinder Rebuild Kit 18-1137 is designed for motorcycle mechanics and off-road enthusiasts looking to restore leaking or unresponsive front braking systems to factory performance. This kit provides all necessary seals and hardware for a cost-effective alternative to replacing the entire master cylinder unit, though it requires a moderate level of mechanical proficiency and brake bleeding knowledge to install correctly.
All features
| Model Part Number | 18-1137 |
|---|---|
| Brand | All Balls |
Extended Product Information
FAQs
Does this kit include the master cylinder housing?
No, this is a rebuild kit consisting of seals, O-rings, and screws. The master cylinder housing must be reused.
What tools are required for the installation?
Basic hand tools, including snap-ring pliers, are typically required for disassembling the internal components of the master cylinder.
Can I use DOT 5 fluid with this kit?
Only use the brake fluid type specified in your motorcycle's owner's manual. Most modern KTM and Husqvarna systems require DOT 4 or 5.1.
How do I know if my master cylinder is repairable?
If the internal bore is smooth and free of scratches, it is generally repairable. Deep grooves in the aluminum bore will prevent the new seals from holding pressure.
How often should I rebuild my master cylinder?
There is no set mileage, but it should be rebuilt if you notice leaks, loss of pressure, or if the bike has been sitting for several years with old brake fluid.
Troubleshooting
Brake lever remains spongy after rebuild
There is likely trapped air in the system. Perform a secondary brake bleed, ensuring you bleed both the master cylinder and the caliper.
Fluid continues to leak after installation
Check the cylinder bore for deep scratches or pits. If the bore is damaged, the seals will not seat properly and the master cylinder housing may need replacement.
Pros and Cons
Pros
- Restores original braking feel and responsiveness
- Cost-effective compared to replacing a complete master cylinder
- Includes all necessary hardware for a full rebuild
- High compatibility with popular KTM, Husqvarna, and Gas Gas models
Cons
- Requires professional-grade knowledge of hydraulic brake systems
- Involves handling corrosive brake fluid during installation
- Proper bleeding of the brake line is mandatory post-installation
Setup, Compatibility & Care
Before installation, ensure you have a compatible brake fluid (typically DOT 4 or 5.1 as specified by your manufacturer).
- Drain the old fluid and remove the master cylinder from the handlebar.
- Disassemble the unit carefully, noting the orientation of old seals.
- Clean the cylinder bore with isopropyl alcohol; do not use abrasive materials that could score the surface.
- Coat new rubber seals with clean brake fluid before installation to prevent tearing.
- Reassemble and bleed the brake system thoroughly to remove trapped air.
Compatibility check: This kit is confirmed for specific KTM Enduro/SMC, Husqvarna 701, and Gas Gas 700 models. Always verify your specific master cylinder part number against the kit MPN before beginning.