Description
This brake master cylinder rebuild kit fits the Honda Acty Truck HA3, HA4 (1990-1999). It reseals the master cylinder that pushes fluid to all four brakes.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
Reasons to choose this brake master cylinder rebuild kit
- A pedal that slowly sinks under steady pressure
- Fluid loss with no external leak
- A soft or inconsistent pedal
- You are refreshing the brake hydraulics
Features & Function
- Reseals the brake master cylinder
- Matched to the Acty master cylinder
- Restores a firm, holding pedal
Installation Specifications
- Difficulty: Advanced.
- Estimated time: about 2 to 3 hours.
- Required tools: A brake-bleed kit, a socket set, and pick tools.
Oiwa Garage Tech Note
"Inspect the bore for pitting before resealing - a marked master bore will not hold. Bench-bleed the master before fitting, then bleed the whole system."
Frequently Asked Questions
Do I bench-bleed the master?
Yes. Bench-bleed it before fitting, then bleed all four corners and confirm a firm, holding pedal before driving.
How do I know the master cylinder is failing?
Hold steady pressure on the pedal; if it slowly sinks to the floor with no external leak, the master cylinder seals are bypassing internally. That is the classic master-cylinder test.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.