Saihisday Front Brake Master Cylinder for Yamaha ATV – Banshee 350, Big Bear 450, YFZ450 & More

Overview

The Saihisday front brake master cylinder is designed to support reliable braking across a wide range of Yamaha ATVs. With a compact piston bore and a standard 7/8 inch handlebar interface, it aims to deliver a consistent feel that riders can count on on dirt trails, back roads, and rugged terrain. This unit is built for a right side installation facing the front tire, making it a straightforward upgrade for compatible models.

Rather than a one size fits all approach, this master cylinder is compatible with multiple Yamaha lineups, including the Banshee, Timberwolf, Wolverine, Big Bear, Grizzly Kodiak and YFZ450 families. By choosing a model that reflects your ATV’s configuration, you can pursue a more predictable braking response without changing other hardware.

Key specifications

• Piston Bore: 1.4 cm
• Handlebar size: 7/8" (22 mm)
• Banjo Bolt: 10x1.25 mm

What you get and how it fits

• 1x motorcycle brake master cylinder
• Replacement Part Number: 4WV-25870-00-00
• Easy installation: typically plug and play, around 30 minutes or less

Note on installation: please fit the part according to professional requirements after delivery to ensure proper alignment and secure mounting. Double checks with a trained technician can help confirm the correct fit for your specific model and year.

Compatibility and fit

This master cylinder is listed as compatible with a range of Yamaha ATVs, including Banshee, Timberwolf, Wolverine, Big Bear, Grizzly Kodiak and YFZ450 variants from different years. Always verify your exact model and year to confirm fitment before purchase.

Riding benefits and use cases

Riders may experience improved brake modulation and a more confident feel during downhill sections, quick stops, or handling uneven terrain. The compact form is designed to minimize interference with nearby components, while the right-side orientation aligns with common ATV layouts.

Durability and care

Built to withstand regular riding conditions, this master cylinder benefits from proper installation and periodic inspection for leaks and seal integrity. Keeping the banjo bolt connection clean and torqued to spec helps maintain a reliable seal over time.

Maintenance tips

• Inspect for fluid leaks around the banjo bolt and reservoir connection
• Check tightness of mounting bolts and ensure correct alignment
• Replace the master cylinder if brake feel changes significantly or if mounting hardware shows wear