Yimi (Guangzhou) Automotive Parts Co, Ltd
| Payment Terms | T/T |
| Push Rod Surface | 18.2 mm (0.717 in) |
| Booster Size | 8 + 9 inch (Tandem) |
| Delivery Time | 5-8 Work Days |
| Boosting Ratio | ≈ 5.0 |
| Packaging Details | Neutral Package or as customers’ request |
| Package Dimensions | 29 × 27.5 × 26.5 cm |
| Push Rod Length | 17.95–18.2 mm (0.707–0.717 in) |
| Supply Ability | 10000 pcs/month |
| Material | High-strength aluminum alloy & precision bearings |
| Mounting Type | Four Bolts Connect Master Pump |
| Net Weight | 4.3 kg |
| Model Number | NKR55 4JB1 |
| Certification | ISO/TS16949 |
| Brand Name | YIMI |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | T/T | Push Rod Surface | 18.2 mm (0.717 in) |
| Booster Size | 8 + 9 inch (Tandem) | Delivery Time | 5-8 Work Days |
| Boosting Ratio | ≈ 5.0 | Packaging Details | Neutral Package or as customers’ request |
| Package Dimensions | 29 × 27.5 × 26.5 cm | Push Rod Length | 17.95–18.2 mm (0.707–0.717 in) |
| Supply Ability | 10000 pcs/month | Material | High-strength aluminum alloy & precision bearings |
| Mounting Type | Four Bolts Connect Master Pump | Net Weight | 4.3 kg |
| Model Number | NKR55 4JB1 | Certification | ISO/TS16949 |
| Brand Name | YIMI | Place of Origin | CHINA |
| High Light | 8+9 Inch Tandem Brake Master Vacuum Assembly ，OEM Fit Vacuum Brake Booster ，Four Bolts Connect Master Pump Brake Booster | ||
Brake Master Vacuum Assembly 8-97033986-1 8970339861 for ISUZU NKR55 NHR98 NPR 4JB1 — Verified OEM Fit 8+9 Inch Tandem Vacuum Brake Booster
The Brake Master Vacuum Assembly with OEM numbers 8-97033986-1 and 8970339861 is a verified direct-fit replacement for ISUZU NKR55 / NHR98 / NPR / NQR / ELF 150 light trucks equipped with the 4JB1 / 4HF1 / 4HG1 / 4JH1 diesel engine. This vacuum brake booster is a critical component of the brake system, responsible for amplifying the driver's brake pedal force through vacuum assistance, ensuring responsive and reliable braking performance under all load conditions.
The brake master vacuum assembly (also called vacuum brake booster) uses engine intake manifold vacuum to amplify the force applied to the brake pedal. It is mounted between the brake pedal and the brake master cylinder, with the master cylinder bolted to its front face. When the brake pedal is depressed, atmospheric pressure enters the booster chamber through the control valve, creating a pressure differential across the internal diaphragm. This pressure differential multiplies the pedal force by a boosting ratio of approximately 5.0 before transmitting it to the master cylinder. The tandem design features two chambers arranged in series, with a combined effective diameter of 8+9 inches, providing significantly greater boost force than a single-chamber booster of the same diameter. This allows the relatively small 4JB1 engine to deliver the strong braking performance required for a commercial light truck.
Replace the brake master vacuum assembly when any of these symptoms appear:
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-97033986-1 | ISUZU OEM Parts Database |
| Part Number (Long) | 8970339861 | ISUZU OEM Parts Database |
| Part Name | MASTER VAC ASM; BRK | ISUZU EPC |
| Vehicle Models | ISUZU NKR55 / NHR98 / NPR / NQR / ELF 150 | ISUZU application catalog |
| Engine Compatibility | 4JB1 / 4HF1 / 4HG1 / 4JH1 | ISUZU application catalog |
| Booster Size | 8 + 9 inch (Tandem) | MAMUR M-3403 specification |
| Net Weight | 4.3 kg | ISUZU replacement parts specification |
| H/S Code | 870830000 | Customs classification |
| Figure/Key Number | 331-001 | ISUZU EPC |
| Package Dimensions | 29 * 27.5 * 26.5 cm | Yishan Auto Parts specification |
| Push Rod Length "L" | 17.95 -18.2 mm (0.707-0.717 in) | ISUZU N-Series Workshop Manual |
| Push Rod to Master Cylinder Mounting Surface | 18.2 mm (0.717 in) | ISUZU N-Series Workshop Manual |
| Boosting Ratio | ≈ 5.0 | ISUZU N-Series Workshop Manual |
| Mounting Type | Four Bolts Connect Master Pump | Product specification |
| Origin | China Aftermarket | Product specification |
| Certification | ISO/TS 16949 | Third-party system audit |
| Type | Number |
|---|---|
| Primary OEM — Short | 8-97033986-1 |
| Primary OEM — Long | 8970339861 |
| Alternate Format | 8-97033986-PT / 8-97033986-0 / 8970339860 |
| Replacing Part No | 8-97033986-0 / 8970339860 |
| Related OEM | 8970917062 / 8-97091706-2 |
| Related OEM | 8-97162798-1 / 8971627981 (4JH1 variant) |
| Competitive Cross-Reference | MAMUR M-3403, TW-8970339861, Izumi 8-97033986-1 |
Platform Note: The 8-97033986-1 / 8970339861 brake master vacuum assembly is part of the ISUZU N-Series brake booster family. The 8-97033986-0 is the earlier version of the same assembly. The 8-97162798-1 is a related booster for the 4JH1 engine variant. The MAMUR M-3403 is the aftermarket reference number for this booster. Confirm your exact engine model and OEM number before ordering.
| Part Number: | 8-97033986-1 8970339861 | Product Name: | Brake Master Vacuum Assembly |
| Car Model: | NKR55 | Engine Model: | 4JB1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It 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 | ||
Primary Applications
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF 150 | NHR98 | 4JB1 / 4JA1 | 1993-1998 |
| ISUZU | ELF 250 | NKR55 | 4JB1 | 1986-2007 |
| ISUZU | NPR | NPR | 4JB1 / 4HF1 | 1994-2002 |
| ISUZU | NQR | NQR | 4JB1 / 4HF1 | 1994-1998 |
| ISUZU | NKR | NKR55 | 4JB1 | 1993-1998 |
| ISUZU | NHR | NHR98 | 4JB1 / 4JA1 | 1993-1998 |
Non-ISUZU Applications (Same Platform):
| Brand | Model | Application |
|---|---|---|
| JMC | 1030 / 1040 | Light Truck |
| JMC | Kaiyun | Light Truck |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company,Seller
Year Established:
2005
Total Annual:
8000000-10000000
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
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