This brake master cylinder is engineered as an OE-equivalent replacement for ISUZU NPR, NPR-HD, NQR, and NRR trucks equipped with 4JJ1 3.0L or 4HK1 5.2L diesel engines from 2008 to 2021. Designed to deliver consistent hydraulic pressure, it ensures reliable braking response essential for commercial and fleet-duty vehicles. Manufactured to OEM dimensional specifications with a 1-3/8 inch bore, this master cylinder provides proper pedal feel, balanced brake pressure, and dependable operation under frequent stop-and-go and heavy-load conditions. Ideal for replacing worn, leaking, or failing brake master cylinders to restore safe braking performance.

Exact OEM-Spec Replacement — Brake master cylinder with 1-3/8 inch bore, built to match factory specifications for proper fit and hydraulic performance

Vehicle-Specific Application — Compatible with ISUZU NPR, NPR-HD, NQR, and NRR trucks equipped with 4JJ1 (3.0L) and 4HK1 (5.2L) diesel engines from 2008–2021

Reliable Brake Pressure Control — Ensures consistent hydraulic force to the braking system for predictable pedal response and improved stopping performance

Commercial-Duty Design — Engineered to withstand high braking loads, frequent use, and demanding fleet or delivery operations

Durable Construction — Precision-machined housing and internal components provide long service life and resistance to leaks and pressure loss

Direct Replacement Fit — Installs using factory mounting points and brake line connections with no modifications required

OEM 

8980326030 / 8980326031