Description
ProX Yamaha Blaster Front Master Cylinder Rebuild Kit
Restore the performance of your front brake system with this Yamaha Blaster Front Master Cylinder Rebuild Kit from ProX Racing Parts. This kit is designed for the factory front brake master cylinder used on 2003–2006 Yamaha YFS200 Blasters.
A worn or leaking master cylinder can cause a soft brake lever, poor braking response or a loss of brake fluid. Rebuilding the original master cylinder replaces its worn internal components and can restore proper hydraulic pressure without the expense of replacing the complete assembly.
Quality ProX Brake Components
ProX Racing Parts produces high-quality replacement components designed to meet or exceed original-equipment standards. This rebuild kit contains the necessary internal components for servicing the applicable front brake master cylinder.
The ProX 37.910020 master cylinder rebuild kit provides an excellent solution for riders restoring an original Yamaha Blaster or repairing a front brake system that no longer operates correctly.
Yamaha Blaster Fitment
This front master cylinder rebuild kit fits:
- 2003 Yamaha Blaster YFS200
- 2004 Yamaha Blaster YFS200
- 2005 Yamaha Blaster YFS200
- 2006 Yamaha Blaster YFS200
The 1988–2002 Yamaha Blaster originally used mechanical drum front brakes and does not have the same hydraulic front master cylinder. This particular kit is intended for the 2003–2006 hydraulic disc-brake models. ProX confirms the YFS200 Blaster 2003–2006 application for part number 37.910020. ProX Racing Parts
Common Signs of a Worn Master Cylinder
Your Yamaha Blaster’s front brake master cylinder may require rebuilding if you notice:
- Brake fluid leaking around the lever or master cylinder
- A front brake lever that feels soft or spongy
- The lever slowly pulling toward the handlebar
- Difficulty building or maintaining brake pressure
- Internal corrosion or contamination
- Poor front brake response after properly bleeding the system
Inspect the brake hose, calipers, fittings and sealing washers before assuming that the master cylinder is the only source of the problem.
Installation Information
The master cylinder bore should be carefully inspected during disassembly. Clean the master cylinder and make sure the bore is free from heavy corrosion, scoring or physical damage. A severely damaged master cylinder body may need to be replaced instead of rebuilt.
Use the correct fresh brake fluid and keep all internal components completely clean during assembly. After installation, thoroughly bleed the front brake system and check every connection for leaks before operating the ATV.
Brake repairs directly affect rider safety. Installation should be performed by someone familiar with hydraulic ATV brake systems.
Complete Your Yamaha Blaster Brake Repair
Ken OConnor Racing carries additional Yamaha Blaster brake parts, including front brake pads, calipers and other replacement components. Inspect the entire system while completing your master cylinder repair so worn parts can be replaced at the same time.
Product Specifications
| Specification | Details |
|---|---|
| Brand | ProX Racing Parts |
| Product | Front master cylinder rebuild kit |
| Manufacturer part number | 37.910020 |
| Vehicle | Yamaha Blaster YFS200 |
| Model years | 2003–2006 |
| Brake location | Front |
| Brake type | Factory hydraulic front brake |
| Condition | New |
FAQ
What years of Yamaha Blaster does this master cylinder rebuild kit fit?
This ProX front master cylinder rebuild kit fits 2003, 2004, 2005 and 2006 Yamaha YFS200 Blasters.
Will this kit fit a 1988–2002 Yamaha Blaster?
No. Earlier Yamaha Blasters originally used mechanical drum front brakes and do not have the same hydraulic front brake master cylinder found on 2003–2006 models.
What is the ProX part number?
The ProX manufacturer part number is 37.910020.
Can this kit repair a leaking Yamaha Blaster master cylinder?
It can repair leaks caused by worn internal seals or components. If the master cylinder bore is deeply corroded, scored or otherwise damaged, the complete master cylinder may need to be replaced.
Do I need to bleed the brakes after installation?
Yes. The front hydraulic brake system must be completely bled after rebuilding the master cylinder. Confirm that the lever develops firm pressure and carefully inspect the system for leaks before riding.
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