Product Description: High-Performance Rear Brake Master Cylinder Assembly for TRX400EX Upgrade your TRX400EX with our Rear Brake Master Cylinder Assembly, designed to enhance braking performance and ensure a safe, controlled riding experience. This comprehensive set includes everything you need for reliable, efficient braking. Applicable Model: Specifically designed for the TRX400EX 400EX models from 1999 to 2004, this rear brake master cylinder assembly ensures a perfect fit and easy installation, enhancing your vehicle's braking capabilities. OE Number Reference: This brake caliper set is compatible with OE numbers 43510 HN1 006, 43250 HN1 006, and 43310 HN1 003. It guarantees compatibility and reliable performance, aligning perfectly with your vehicle's original specifications. Accurate Control: Engineered for precision, the rear brake caliper delivers accurate control over braking force, enhancing rider control and safety. Experience improved performance and confidence during every ride. Better Heat Dissipation: Constructed with special materials and a heat dissipation design, these brake calipers efficiently dissipate heat, preventing overheating and ensuring a safe and stable riding experience even in demanding conditions. Adjustment Performance: Featuring adjustable clamping force and braking feel, this rear brake hydraulic caliper allows riders to customize their braking experience. Tailor the performance to your preference for optimal control and comfort. Enhance your TRX400EX's braking system with our Rear Brake Master Cylinder Assembly, designed for superior performance and reliability. Ideal for enthusiasts seeking improved safety and customization in their riding experience.