Rear Brake Master Cylinder Rebuild Kit for Kawasaki KX250 KX 250 1988-1990

Rear Brake Master Cylinder Rebuild Kit for Kawasaki KX250

This rear brake master cylinder rebuild kit brings the rear brake system on 1988-1990 Kawasaki KX250 motorcycles back to working order, replacing worn seals and internal parts so the master cylinder holds pressure and the brake responds predictably.

Overview

This rear brake master cylinder rebuild kit is a practical service part for keeping a vintage KX250 safely stoppable. The kit renews the internal seals and components of the rear master cylinder so hydraulic pressure builds correctly again. It fits the 1988-1990 Kawasaki KX250 and suits riders and mechanics handling their own brake service.

Built For Performance

• Complete seal and internal rebuild set for the rear brake master cylinder
• Restores firm, consistent rear brake feel
• Seal profiles matched to the factory master cylinder
• Designed around the 1988-1990 Kawasaki KX250 rear brake setup
• Addresses leaks, spongy response, and sluggish brake return
• Simple enough for a confident home mechanic to install

Fits These Machines

• for Kawasaki KX250 1988
• for Kawasaki KX250 1989
• for Kawasaki KX250 1990

On-The-Job Use

• Reviving rear brakes on a restored or long-stored KX250
• Routine hydraulic brake maintenance at home
• Track day fixes when rear braking loses its bite
• Workshop service on late 1980s and early 1990s motocross bikes

Specs At A Glance

Good To Know

Q: Will I need to bleed the rear brake after the rebuild? A: Yes, air must be purged from the system after reassembly to get a firm pedal. Use fresh brake fluid and inspect the seals for weeping before you ride.

Q: Is the master cylinder bore reusable with this kit? A: The bore must be clean and free of scoring or corrosion for the new seals to work. A damaged bore can prevent proper sealing and may call for a replacement cylinder.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.