Hydraulic Wheel Cylinder Piston for Nissan Vans & Light Trucks

This precision piston sits inside the rear drum brake wheel cylinder. It converts brake fluid pressure into straight push force, moving the brake shoes against the drum. If your pedal feels long, rear brakes grab unevenly, or there’s fluid mist on the backing plate, this core hydraulic piece is likely worn and ready for renewal.

Why this part is needed ️

Daily stop‑and‑go, heat, and moisture wear the piston surface and seals. A fresh piston restores tight sealing and consistent rear brake force, ensuring stable stopping distances and even shoe contact.

How it works ⚙️

When you press the pedal, fluid pressure travels to the wheel cylinder. The piston slides outward, pushing the shoe linings into the drum. Once pressure drops, return springs pull the shoes back and the piston retracts smoothly.

What happens if it’s broken or worn ❗

• Spongy or sinking brake pedal
• Pulling to one side during braking
• Brake fluid leaks, wet dust boots, low reservoir level
• Overheating drum, glazing, uneven shoe wear

Tech notes for fitment

Clean the cylinder bore, lightly hone if needed, lube with brake fluid only, and always replace seals and boots together. Bleed the system after assembly and verify drum diameter and shoe arc.

Compatibility

• Nv350 Caravan
• Urvan
• Atlas
• Nt400 Cabstar
• Caravan
• Nv350 Urvan
• Presage
• Elgrand
• Quest
• Cabstar