Yimi (Guangzhou) Automotive Parts Co, Ltd
| Mounting | Bolt‑on to firewall (4‑stud flange) |
| Master Cylinder Type | Tandem (dual hydraulic circuit) |
| Booster Type | Vacuum‑assisted (single diaphragm, engine‑driven vacuum pump) |
| Supply Ability | 10000 pcs/month |
| Packaging Details | Neutral Package or as customers’ request |
| Brake System | Drum front and rear, hydraulic with vacuum servo, dual circuit |
| Engine Compatibility | ISUZU 4JH1 / 4JH1‑TC (3.0L, 2,999 cc, turbo‑diesel) |
| Net Weight | 3.2–3.5 kg |
| Materials | Booster casing: corrosion‑resistant coated steel; Master cylinder body: aluminum alloy |
| Payment Terms | T/T,Western Union |
| OEM Part Number | 8-97162798-1, 8971627981 |
| Delivery Time | 5-8 Work Days |
| Certification | ISO/TS16949 |
| Model Number | ISUZU NKR77 4JH1 |
| Brand Name | YIMI |
| Place of Origin | China |
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Product Specification
| Mounting | Bolt‑on to firewall (4‑stud flange) | Master Cylinder Type | Tandem (dual hydraulic circuit) |
| Booster Type | Vacuum‑assisted (single diaphragm, engine‑driven vacuum pump) | Supply Ability | 10000 pcs/month |
| Packaging Details | Neutral Package or as customers’ request | Brake System | Drum front and rear, hydraulic with vacuum servo, dual circuit |
| Engine Compatibility | ISUZU 4JH1 / 4JH1‑TC (3.0L, 2,999 cc, turbo‑diesel) | Net Weight | 3.2–3.5 kg |
| Materials | Booster casing: corrosion‑resistant coated steel; Master cylinder body: aluminum alloy | Payment Terms | T/T,Western Union |
| OEM Part Number | 8-97162798-1, 8971627981 | Delivery Time | 5-8 Work Days |
| Certification | ISO/TS16949 | Model Number | ISUZU NKR77 4JH1 |
| Brand Name | YIMI | Place of Origin | China |
| High Light | ISUZU NKR77 brake master vacuum assembly ，diesel-specific vacuum system for ISUZU ，tandem hydraulic circuit brake assembly | ||
The brake master vacuum assembly (also referred to as brake booster assembly or vacuum servo unit) carrying OEM numbers 8-97162798-1 and 8971627981 integrates the vacuum brake booster and the hydraulic master cylinder into a single pre‑assembled unit. It is a direct bolt‑on replacement for ISUZU NKR77 series light‑duty trucks powered by the 4JH1 3.0L turbo‑diesel engine, as well as related chassis such as NLR85, NPR75, and certain 100P/600P variants.
| Part Number: | 8-97162798-1 8971627981 | Product Name: | Brake Master Vacuum Assembly |
| Car Model: | ISUZU NKR77 | Engine Model: | ISUZU 4JH1 |
| 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 |
This ISUZU NKR77 brake master vacuum assembly 8-97162798-1 directly replaces the factory unit in the following configurations:
| Chassis / Model | Engine | Years | Notes |
|---|---|---|---|
| ISUZU NKR77 | 4JH1 / 4JH1‑TC | 2002–2006 | Primary application; Euro 4, common‑rail turbo‑diesel |
| ISUZU NLR85 | 4JH1 | 2005–2010 | Light‑duty cab‑over chassis |
| ISUZU NPR75 | 4JH1 | 2002–2006 | Medium chassis variant |
| ISUZU 100P TC / 600P | 4JH1 | 2000–2007 | Cab‑over chassis using same brake booster design |
| ISUZU ELF (Japanese domestic) | 4JH1 | 2002–2006 | All NKR77, NLR85, NPR75 variants |
| ISUZU KB / Rodeo (selected markets) | 4JH1‑TC | 2002–2008 | 4x4 pickup with same booster design |
The NKR77 was widely exported to Southeast Asia, the Middle East, Africa, Latin America, and Australia under various badges. The 4JH1 engine is known for its reliability, but the brake booster diaphragm – subjected to constant vacuum cycling – is a wear component that typically requires replacement between 200,000 and 350,000 km.
| QC Item | Verification Method |
|---|---|
| Vacuum retention test | Booster evacuated to 500 mmHg and monitored for 30 seconds; pressure drop ≤ 2 mmHg passes |
| Hydraulic pressure test | Master cylinder pressurized to 1,200 psi for 60 seconds; zero external leakage |
| Pushrod projection measurement | Verified to ISUZU factory specification for NKR77; locked with adjustment nut |
| Mounting flange flatness | Dial gauge measurement, flatness within 0.1 mm to prevent vacuum leaks |
| Master cylinder outlet thread | Go/No‑go gauges for M10 * 1.0 and M12 * 1.0 threads |
| Booster casing integrity | Visual and dye penetrant inspection for weld cracks on casing seams |
| Salt spray test (batch sampling) | Random sample per 500 units tested to ASTM B117, 96 hours, no red rust |
| Assembly torque verification | All mounting nuts and line fittings torqued to ISUZU specification |
| Full functional test (batch sampling) | Random 2–5% of each batch tested on air‑over‑hydraulic bench |
The ISUZU NKR77 4JH1 brake master vacuum assembly 8-97162798-1 is a pre‑assembled, OEM‑specification replacement that combines the vacuum brake booster and tandem master cylinder into a single unit. It is a direct fit for 2002–2006 NKR77, NLR85, NPR75, 100P TC, and 600P trucks powered by the 4JH1 3.0L turbo‑diesel engine. Pre‑set pushrod projection and ISO/TS16949 certified manufacturing ensure consistent quality. One SKU covers multiple ISUZU chassis.
Order a sample unit today to verify fitment on your NKR77 chassis – the same assembly fits all 4JH1‑powered NKR77 trucks regardless of export market.
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 automotiv... 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 automotiv...
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