ISUZU Brake Master Cylinder 8-97224372-0 8972243720 for NPR NPR-HD NQR 4HF1 4HE1 4HK1 — OEM Standard 1-1/4 Inch Aluminum Housing Verified Fit
Key Attributes
Product Summary
OEM-standard ISUZU brake master cylinder 8-97224372-0 for NPR/NQR with 4HF1/4HE1/4HK1 engines. Precision-honed 1-1/4 inch aluminum housing ensures stable hydraulic output and durability. ISO/TS16949 certified, 100% tested, direct fit with no modification. Custom packaging and 6–12 month warranty available.
Product Details
ISUZU Brake Master Cylinder 1-1/4 Inch
,OEM 8972243720 NPR NPR-HD NQR Fit
,Aluminum Housing Brake Master Cylinder
This master cylinder (CYLINDER ASM; BRK MASTER) features a precision-machined aluminum housing with a bore diameter of 1-1/4 inch (approx. 31.75 mm), a precision-honed cylinder bore, and brake-fluid-resistant seals to ensure smooth piston movement and stable hydraulic output. It is manufactured to OEM standard dimensions for direct replacement without modification to brake lines or mounting brackets.
| Part Number | 8-97224372-0 / 8972243720 | Product Name | Brake Master Cylinder |
|---|---|---|---|
| Car Model | NPR, NPR-HD, NQR | Engine Model | 4HF1, 4HE1, 4HK1 |
| Condition | 100% Brand New | Size | Standard |
| Weight | Standard (approx. 1.2 kg net) | Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe | Package | Neutral Packing or Made as Requested |
| Material | High-strength aluminum alloy & precision bearings | Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement | Quality Standard | OEM equivalent / ISO quality control |
| Bore Diameter | 1-1/4 inch (31.75 mm) | Mounting Holes | 4 |
| Number of Outlets | 2 | Outlet Thread | M10 × 1.0 |
| HS Code | 870830000 | Fig. No.-Key No. | 330-001 |
| Reservoir Type | Integrated | Warranty | 6–12 Months |
| Delivery Time | 15–20 Days | Supply Ability | 10,000 pcs / Month |
ISUZU Brake Master Cylinder Assembly — OEM No. 8-97224372-0 / 8972243720
| Brand | Model | Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | N-Series | 4HF1 / 4HE1-TC / 4HK1 / 4BD2-TC | 1994–2014 |
| ISUZU | NPR-HD | N-Series | 4HE1-TC / 4HK1 | 1994–2014 |
| ISUZU | NQR | N-Series | 4HK1 / 4HE1 | 1994–2014 |
| ISUZU | ELF | ELF Series | 4HF1 / 4HK1 | Series reference |
| ISUZU | N-Series | N-Series | 4HF1 / 4HE1 | 1996–1997 |
| CHEVROLET | W3500 / W4500 Tiltmaster | W-Series | — | 1996–1998 |
| GMC | W3500 / W4500 Forward | W-Series | — | 1996–1998 |
Data Source: Vehicle and year compatibility per Dorman HD Solutions, TruckID, eBay, and Euro4x4parts product pages.
- Booster Type Confirmation: Some ISUZU N-Series models (e.g., NPR69 3.1 TDI 1994–1998) may not have a hydro brake booster, while this product primarily fits configurations with a booster. Confirm the original brake system configuration before ordering.
- Year / Configuration Variation: This master cylinder covers 1994–2014 model years, but variations may exist across different years or configurations (diesel vs. gas, cab styles, etc.). Verify the original master cylinder number before installation.
- Reservoir Confirmation: Some suppliers describe this product as having an integrated reservoir, while some Dorman alternatives use a remote reservoir and do not include the reservoir. Confirm the required configuration before ordering.
- Pre-Installation Verification: Please provide the VIN or original master cylinder number for precise fitment confirmation.
| Feature | Benefit & Verification Signal |
|---|---|
| 1-1/4 Inch Bore Design | Bore diameter precisely matches original brake system specification, ensuring hydraulic output and pedal travel consistent with original — verified against Dorman / TruckID specification (1-1/4 in). |
| Aluminum Housing Construction | Precision-machined aluminum housing, corrosion-resistant and lightweight, ensuring long-term stable hydraulic sealing performance — verified against Dorman and Japanese product page material specification (Aluminum). |
| Precision-Honed Cylinder Bore | Cylinder bore precision-honed for smooth piston movement, reducing internal leakage and pedal sink risk — verified against Japanese product page description of a precision-honed hydraulic cylinder. |
| EPDM Brake-Fluid-Resistant Seals | All rubber seals made of EPDM compound, resistant to glycol-based brake fluid, extending service life — verified against Dorman product description. |
| Direct Replacement Design | Mounting holes (4) and outlet threads (M10×1.0) precisely match original, no brake line modification required — verified against Dorman / TruckID specification. |
| ISO/TS16949 QMS Certified | Manufacturer quality management system meets automotive industry standards — per supplier certification information. |
| 6–12 Month Warranty | Provides reliable after-sales protection — per supplier warranty terms. |
| QC Item | Verification Method |
|---|---|
| Bore Diameter Accuracy Inspection | Inside micrometer / CMM measurement — ensures bore diameter 1-1/4 inch (31.75 mm) meets OEM standards. |
| Cylinder Bore Surface Roughness Inspection | Roughness tester — verifies honed surface Ra value meets hydraulic sealing requirements. |
| Sealing Performance Test | Air / hydraulic pressure test — verifies no internal or external leakage under rated pressure. |
| Outlet Thread Precision Inspection | Thread go / no-go gauge — verifies M10×1.0 thread precision meets standards. |
| Material Composition Test | Spectrometer analysis — verifies aluminum housing material meets standards. |
| Appearance & Packaging Inspection | 100% visual inspection — no blowholes, cracks, or scratches; packaging meets transport requirements. |
Certification: The manufacturer holds ISO/TS16949 automotive quality management system certification. Products undergo 100% testing before shipment.
The brake master cylinder is a critical safety component. Installation involves brake hydraulic system disassembly and bleeding. Professional installation by a qualified technician is strongly recommended. Thoroughly clean the master cylinder mounting surface and brake line fittings before installation. Never allow brake fluid to contact painted surfaces (brake fluid is corrosive). After installation, the brake system must be thoroughly bled until the pedal feels firm.
- Disconnect power: Disconnect the negative battery terminal to prevent electrical short circuits.
- Drain brake fluid: Extract brake fluid from the reservoir using a syringe or suction tool to prevent overflow and paint damage.
- Remove old master cylinder: Disconnect the master cylinder from the brake booster / pedal (push rod, fixing nuts) and disconnect the front / rear brake line fittings (use a flare nut wrench to prevent fitting damage).
- Install new master cylinder: Position the new master cylinder and tighten the fixing nuts to the specified torque. Note: If the push rod length is adjustable, adjust push rod clearance per the workshop manual.
- Connect brake lines: Reconnect the front / rear brake line fittings and tighten to the specified torque (reference M10×1.0 thread standard torque).
- Fill brake fluid: Fill with the specified new brake fluid to the specified reservoir level.
- Bleeding procedure: Bleed air from the brake lines per the workshop manual sequence (typically RR → LR → RF → LF) until the pedal is firm without sponginess.
- Leak and function test: Check all fittings for leakage; start the engine, depress the brake pedal to test brake assist, and perform a low-speed road test to confirm braking performance.
- Every 20,000 km or 12 months: Check brake fluid level and quality; inspect the master cylinder and lines for leakage.
- Every 40,000–50,000 km: Replace brake fluid (refer to the ISUZU workshop manual interval).
- When a spongy pedal, increased travel, brake pull, or abnormal brake fluid level drop is detected: Stop immediately and inspect the master cylinder seals and lines to eliminate safety hazards.
Replaces ISUZU OEM numbers: 8-97224-372-0 / 97224372 / 8-97100075-2 / 8-97100075-0 / 8-97129692-0 / 8-97219305-0 / 8971000750 / 8971000752 / 8972243720 / 8973151660 / 8972243710 / 8971087111.
International brand cross-reference includes Dorman M630790 / M630793 and Bendix 130.76010 / 130.76008.
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