Internal hose degradation, environmental wear, and repeated thermal cycling can cause internal rubber lines to swell, crack, or develop leaks, leading to pressure loss and uneven caliper response during braking. These issues compromise stopping power, extend pedal travel, and risk fluid leaks that can cause caliper sticking or failure. Upgrading to this premium OE replacement caliper ensures a direct fit with robust construction designed for severe-duty conditions, restoring hydraulic responsiveness and preventing volumetric expansion under high-pressure loads.
Constructed with a durable zinc coating, this caliper offers excellent corrosion resistance, which is critical in harsh environmental conditions typical of commercial fleet use. Its precise fitment for Acura MDX models from 2001 through 2003 and Honda Pilot from 2003 to 2005 makes it an ideal choice for fleet operators seeking reliable, high-performance replacements. The caliper’s design includes high-grade piston components and mounting hardware to withstand continuous heavy-duty operation, ensuring long service life and consistent braking performance.
Installation of this caliper requires careful inspection of the existing mounting brackets, brake hose connections, and compatibility with existing brake hardware. Proper bleeding procedures must be followed to eliminate air from the hydraulic system and restore full braking capacity. Regular post-installation testing should include checking for proper caliper slide action and ensuring no chafing occurs against chassis or suspension components during full lock or heavy load conditions.
Features:
- OE Replacement Part Number: 331-59609
- Position: Rear Left Caliper for Acura MDX 2001-2003 and Honda Pilot 2003-2005
- Construction: Silver Zinc Coated for Superior Corrosion Resistance
- Design: Heavy-Duty Piston and Mounting Hardware for Severe-Duty Fleet Applications
- Compatibility: Direct Fit for Acura MDX and Honda Pilot Models within specified years



