Description
This brake caliper piston set fits the Honda Acty Truck HA3, HA4 (1990-1999). It presses the pad against the rotor under hydraulic pressure.
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 caliper piston set
- A pitted, seized, or corroded piston
- A dragging or uneven-wearing brake
- You are rebuilding the caliper
Features & Function
- Presses the pad against the rotor
- Correct size for the Acty front caliper
- Restores clean caliper action
Installation Specifications
- Difficulty: Moderate.
- Estimated time: about 1 to 2 hours per caliper.
- Required tools: A socket set, a brake-bleed kit, and pick tools.
Oiwa Garage Tech Note
"Fit fresh seals with the piston and lube the bore with clean brake fluid on assembly. Bleed the brakes and test the pedal before driving."
Frequently Asked Questions
Should I replace the seals too?
Yes. Fit fresh caliper seals with the piston and bleed the system before driving.
How do I know the caliper piston is bad?
A dragging brake, uneven pad wear, or a piston that is pitted and will not push back cleanly points to a failed piston. Inspect the bore for pitting while you are in there.
How do I seat the new piston?
Lube the bore and piston with clean brake fluid, then press the piston in square by hand or with a piston tool so it does not cock and tear a seal.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.