Brake Caliper Piston Rear For Yamaha YFM 550 DE PE 14 YFM550FG 09 13 YFM700DE PE 14 15 YFM700DF PF 15 YFM700FG 07 13

This brake caliper piston is a rear, aftermarket replacement component engineered to restore precise hydraulic action on YFM 550 and YFM 700 FG rear braking systems. Replacing a worn piston helps bring back consistent pad contact, a firm lever feel, and dependable stopping power on trails or job sites. Built to tight tolerances with corrosion‑resistant materials, this piston assembly returns the caliper to near‑OEM performance without the OEM price. Install with standard caliper service practices to ensure proper seating of the piston and seals.

Over time, piston corrosion, seal wear, and dust boot degradation can lead to brake drag, uneven pad wear, and reduced braking performance. Choosing a quality aftermarket piston provides reliable sealing, smooth piston movement, and long‑lasting performance in demanding conditions like muddy trails or farm work, where dependable braking matters most.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit includes the essential rear brake caliper piston assembly.

• Rear Brake Caliper Piston Assembly

Note: related seals, boots, and mounting hardware are not included unless explicitly specified.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely machined to fit the rear caliper piston bore on the YFM 550 and YFM 700 FG families, minimizing installation guesswork.
• OEM Cross-Reference: Backed by known OEM part references such as 3B4-W0057-10-00, ensuring alignment with Yamaha specs.
• Premium Materials: Built from corrosion‑resistant alloys designed for consistent piston movement in dusty, muddy conditions.
• Performance Restoration: Restores reliable braking feel, even pad contact, and smooth lever travel after piston wear or seizing.
• Cost-Effective Reliability: A high‑quality aftermarket option that delivers OEM-like performance without the OEM price tag.
• Trail & Farm Ready: Durable construction engineered to withstand mud, immersion, and gritty working environments common to utility riding.

Installation Notes:

• Carefully inspect the caliper bore for scoring or corrosion before installation; any damage should be addressed prior to reinstall.
• Clean the bore with a brake-cleaning solvent and dry with lint-free towels to ensure a pristine seating surface for the new piston.
• Lubricate the piston seal lips with a high-temperature brake grease or manufacturer-approved lubricant before assembly; avoid petroleum-based lubricants.
• Replace the dust boot and seal components if included in your kit; otherwise inspect and reuse only if in excellent condition and compatible with the piston.
• Bleed the brake hydraulics after installation to remove air and verify a firm lever with no sponginess.
• Bed‑in the brakes after installation by gradual applications from light to moderate pressure to evenly seat the piston against the new seal.

Why Upgrade?

Running a worn or damaged rear caliper piston markedly increases the risk of brake drag, uneven pad wear, and reduced stopping power. Replacing with this aftermarket piston restores proper sealing and piston movement, returning consistent braking performance and peace of mind for both trail use and farm work.