Manufacturer Part Number:
06-353
Cross-Reference OEM Part Numbers:
Yamaha: 4BA-W0042-50-00
Yamaha: 5TG-W0042-50-00
Kit Contents:
• Master cylinder piston
• Return spring
• Primary and secondary seals
• Gaitor boot (dust cover)
• Circlip
• Copper crush washers
• Assembly grease
Notes:
• Complete front brake master cylinder rebuild kit
• One kit fits all listed Yamaha sport ATV models
• Replace when brakes feel spongy, lever pulls to bar, or fluid leaks
• Always use fresh DOT 4 brake fluid after rebuild
Function:
The front brake master cylinder converts lever pressure into hydraulic pressure to actuate the brake caliper. Over time, internal seals wear and degrade, causing brake fade, spongy lever feel, fluid leaks, or complete loss of front braking. This rebuild kit replaces all wear components to restore full braking performance.
When to Rebuild:
• Brake lever pulls to handlebar even after bleeding
• Visible fluid leak at master cylinder body or lever pivot
• Spongy or inconsistent brake feel
• Brake fluid discoloration (dark or cloudy fluid)
• During routine maintenance every 2-3 years or as needed
Installation Notes:
• Clean master cylinder bore thoroughly before installing new components
• Apply included red rubber grease to seals during assembly
• Use fresh DOT 4 brake fluid — never reuse old fluid
• Bleed brake system completely after rebuild
• Verify no air in system — lever should feel firm with no sponginess
PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.
WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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