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
Specifications
| SKU / Part Number | 8032603 |
|---|---|
| Brand | CHM |
| OEM | 8980326030, 8980326031
|
| Weight | 2.63 lb |
| Dimensions (L × W × H) | 7 in × 4 in × 4 in |
| Category | Brake System |
Compatibility
| Make | Model | Years | Engine | Liters | Fuel |
|---|---|---|---|---|---|
| Isuzu | NPR | 2008–2009 | 4HK1-TC | 5.2 | Diesel |
| Isuzu | NPR | 2008–2020 | GM Vortec V8 | 6.0 | Gas |
| Isuzu | NPR | 2011–2018 | 4JJ1-TC | 3.0 | Diesel |
| Isuzu | NPR | 2021 | GM L8T V8 | 6.6 | Gas |
| Isuzu | NQR | 2008–2021 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W3500 Tiltmaster | 2008–2009 | 4HK1-TC | 5.2 | Diesel |
| Chevrolet | W3500 Tiltmaster | 2008–2009 | GM Vortec V8 | 6.0 | Gas |
| Chevrolet | W5500 Tiltmaster | 2008–2010 | 4HK1-TC | 5.2 | Diesel |
| GMC | W3500 Forward | 2008–2009 | 4HK1-TC | 5.2 | Diesel |
| GMC | W3500 Forward | 2008–2009 | GM Vortec V8 | 6.0 | Gas |
| GMC | W5500 Forward | 2008–2010 | 4HK1-TC | 5.2 | Diesel |