This brake master cylinder is designed as an OE-equivalent replacement for ISUZU NQR, NPR, and NPR-HD trucks equipped with the 4HK1 5.2L and gas engines from 2021 to 2026. It restores proper hydraulic pressure to the braking system, ensuring consistent pedal feel, responsive braking, and reliable stopping performance in commercial-duty vehicles. Manufactured to OEM dimensional and performance specifications, this master cylinder provides precise bore sizing, secure sealing, and smooth brake fluid transfer. Ideal for replacing leaking, worn, or failing master cylinders during routine maintenance or brake system service. 

Exact OE Replacement — Designed to match factory specifications for proper fit, mounting alignment, and hydraulic performance

Vehicle Compatibility — Fits ISUZU NQR, NPR, and NPR-HD trucks (2021–2026) equipped with the 4HK1 5.2L and gas engines

Restores Brake System Performance — Delivers consistent hydraulic pressure for stable pedal response and dependable braking control

Commercial-Duty Construction — Engineered to withstand high operating pressure, frequent stop-and-go cycles, and heavy vehicle loads

Precision-Machined Components — Ensures smooth piston movement, reduced internal leakage, and long service life

Direct Replacement Installation — Installs directly in place of the original master cylinder using factory mounting points and brake line connections; no modifications required

OEM

8981917872 / 8981917874 / 8981917873