Brake Vacuum Booster 8-97036929-0 for ISUZU NPR 4HF1 4JH1 4HK1 — OEM 8970369290, 8"+9" Tandem, Verified Fit
Key Attributes
Product Summary
Direct-fit 8"+9" tandem vacuum brake booster for ISUZU NPR (4HF1/4JH1/4HK1). Features NBR diaphragm, precision-stamped steel housing, integrated check valve, and IATF 16949 certification. 100% vacuum leak tested. OEM 8-97036929-0/8970369290. Neutral or custom packaging available.
Product Details
Brake Vacuum Booster ISUZU NPR
,8"+9" Tandem Brake Booster
,OEM 8970369290 Brake Booster
The Vacuum Brake Booster with OEM number 8-97036929-0 (8970369290) is a direct-fit replacement for ISUZU NPR trucks (including NPR66, NPR70, NPR71, NPR75) equipped with 4HF1, 4JH1, or 4HK1 diesel engines. This booster uses engine vacuum to multiply brake pedal force, reducing driver effort and improving stopping safety.
The vacuum booster sits between the brake pedal and the master cylinder. Engine intake manifold vacuum is stored in the booster's front chamber. When the pedal is pressed, a control valve admits vacuum to the rear chamber, creating a pressure differential across the internal diaphragm. This differential multiplies the pedal force applied to the master cylinder piston, delivering higher hydraulic pressure with less driver effort. The integrated check valve retains residual vacuum for one or two assisted stops after engine shutdown.
- Tandem Diaphragm Configuration Confirmed: 8"+9" double diaphragm — per NAKOL (BTY190) and Yimi supplier specifications.
- Material & Construction Specified: Precision-stamped cold-rolled steel housings; NBR (Nitrile Butadiene Rubber) diaphragm resistant to oil, heat, and aging.
- Quality Certification: IATF 16949 (NAKOL) / ISO/TS 16949 (Yimi) — manufacturing quality system compliance referenced by suppliers.
- Testing Protocol: Every booster undergoes vacuum tightness testing, durability testing, and boosting performance inspection before leaving the factory — per NAKOL production description.
- OEM Cross-Reference Verified: Replaces 8-97036929-0 / 8970369290 / 8-97036-929-0. Interchangeable reference TKY190 (NAKOL) also confirmed.
- Dimensional Data Gap: Pushrod length, mounting hole spacing, and vacuum assist ratio values are not disclosed in available search results. Request a dimensional drawing if precise fitment verification is required.
- Hard brake pedal requiring excessive force to stop
- Hissing or whistling sound from under the dash when braking (vacuum leak)
- Engine idle changes or stalls when brake pedal is pressed
- Brake pedal feels spongy or does not return properly
- Visible corrosion or brake fluid leakage at the booster body
| Part Number | 8-97036929-0 |
|---|---|
| Product Name | Brake Vacuum Booster |
| Car Model | ISUZU NPR |
| Engine Model | 4HF1, 4JH1, 4HK1 |
| Condition | 100% Brand New |
| Weight | Standard |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing Or Make It As Requested |
| Warranty | 6 Months |
| Price & Stock | Please Contact Us To Get More Information |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model | Engine Code | Notes |
|---|---|---|---|
| ISUZU | FSR / FSR 500 | 6HE1 | Primary fitment per OEM number |
| ISUZU | FVR / FTR | 6HE1 (verify) | Some cross-applications reported; confirm by VIN |
⚠️ Important Fitment Notes:
- HDA-008 / MC828264 are aftermarket cross-reference numbers, primarily appearing in Mitsubishi Fuso brake booster catalogs. This product is primarily oriented toward ISUZU FSR 6HE1 fitment; the above numbers are listed for customer cross-comparison.
- If your vehicle is a Mitsubishi Fuso FK/FM with an MC828264 booster, confirm pushrod length and mounting bolt pattern match before ordering. "Short" vs. "long" pushrod variants exist within the MC828264 family.
- Always provide the VIN/chassis number for verification. Do not rely solely on cross-reference numbers.
| Feature | Benefit + Verification Signal |
|---|---|
| 8"+9" tandem diaphragm | Provides higher boost force than single-diaphragm designs, suitable for loaded commercial trucks — confirmed by NAKOL and Yimi specifications. |
| NBR diaphragm | Resists oil, heat, and aging for stable sealing under long-term use — material specified by NAKOL. |
| Precision-stamped steel housing | Withstands continuous vacuum pressure without deformation or leakage — manufacturing process described by NAKOL. |
| IATF 16949 certification | Indicates automotive quality management system compliance — certification referenced by supplier. |
| 100% vacuum leak tested | Reduces risk of out-of-box failure — per NAKOL production protocol. |
| OEM-matched fitment | Direct replacement for worn or warped original unit — OEM number confirmed across multiple suppliers. |
| Metal construction | Withstands braking heat and friction — material confirmed by supplier listing. |
| QC Item | Verification Method |
|---|---|
| Vacuum tightness | 100% tested per unit — supplier protocol |
| Diaphragm integrity | NBR material specification; sampled inspection |
| Housing weld integrity | Precision stamping and welding per supplier description |
| Pushrod movement | Sampled functional check — request supplier data if critical |
| Check valve function | Sampled test — integrated valve described by Ecer |
| Packaging integrity | Carton condition check per shipment |
⚠️ IMPORTANT: Brake booster replacement involves the hydraulic brake system. Air must be purged from the system after installation. Professional workshop installation is strongly recommended.
- 1Disconnect battery negative terminal; locate booster under hood at firewall.
- 2Remove master cylinder from booster (support aside; avoid disconnecting brake lines if possible).
- 3Disconnect vacuum hose from booster check valve.
- 4Remove clevis pin connecting booster pushrod to brake pedal arm (under dash).
- 5Unbolt booster from firewall (typically 4 nuts); remove booster.
- 6Transfer check valve and fittings from old booster to new unit if not included.
- 7Install new booster in reverse order; torque firewall nuts to OEM spec (confirm in manual).
- 8Reconnect master cylinder; bleed brake system thoroughly per OEM procedure.
- 9Test pedal feel and vacuum assist before road test.
- Inspect vacuum hose and check valve every 40,000–60,000 km or during brake service.
- Replace booster if pedal hardness, hissing noise, or vacuum leak is confirmed and cannot be resolved by hose/valve replacement.
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