Yimi (Guangzhou) Automotive Parts Co, Ltd
| Part Type | Vacuum Booster + Brake Master Cylinder Integrated Assembly |
| Compatible Engine | ISUZU 4JA1 |
| Certifiion | ISO/TS16949 |
| Installation Position | Engine bay firewall / between brake pedal and brake lines |
| Payment Terms | T/T |
| Material | High-strength aluminum alloy & precision bearings |
| Delivery Time | 5-8 Work Days |
| Cooling Type | Engine coolant circulation |
| Compatible Model | ISUZU TFR54 |
| Quantity per package | 1 pc/box |
| Supply Ability | 10000 pcs/month |
| Packaging Details | Neutral Package or as customers’ request |
| Product Net Weight | 2.9 kg |
| Model Number | TFR54 4JA1 |
| Place of Origin | CHINA |
| Brand Name | YIMI |
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Product Specification
| Part Type | Vacuum Booster + Brake Master Cylinder Integrated Assembly | Compatible Engine | ISUZU 4JA1 |
| Certifiion | ISO/TS16949 | Installation Position | Engine bay firewall / between brake pedal and brake lines |
| Payment Terms | T/T | Material | High-strength aluminum alloy & precision bearings |
| Delivery Time | 5-8 Work Days | Cooling Type | Engine coolant circulation |
| Compatible Model | ISUZU TFR54 | Quantity per package | 1 pc/box |
| Supply Ability | 10000 pcs/month | Packaging Details | Neutral Package or as customers’ request |
| Product Net Weight | 2.9 kg | Model Number | TFR54 4JA1 |
| Place of Origin | CHINA | Brand Name | YIMI |
| High Light | ISO/TS16949 Certified Brake Master Vacuum Assembly ，Compatible with ISUZU TFR54 4JA1 Brake System Component ，Brand New 100% Quality Inspected Vacuum Booster + Brake Master Cylinder Integrated Assembly | ||
The ISUZU Brake Master Vacuum Assembly with OEM numbers 8-97021942-2 / 8970219422 is a precision-engineered replacement designed for ISUZU TFR54 series pickup trucks, compatible with 4JA1 diesel engines. This component is the core power amplifiion unit of the vehicle's hydraulic braking system, integrating both the vacuum booster and brake master cylinder to amplify the driver's braking force using engine intake manifold vacuum.
The Brake Master Vacuum Assembly consists of two integrated components: the vacuum booster and the brake master cylinder. When the engine is running, intake manifold vacuum is transmitted to the booster unit through a vacuum hose. The booster interior is divided by a diaphragm into two chambers. When the driver depresses the brake pedal, the push rod moves the control piston and diaphragm forward, closing the vacuum port and opening the atmospheric port, allowing atmospheric pressure to enter the chamber behind the diaphragm. The pressure differential across the diaphragm generates an assist force, transmitted through the push rod to the master cylinder. The master cylinder converts this mechanical force into hydraulic pressure, which is transmitted through brake fluid lines to the wheel brakes for vehicle deceleration.
Inspect immediately if any of these symptoms occur:
| Symptom | Probable Cause |
|---|---|
| Brake pedal feels stiff and hard to press; requires excessive effort | Damaged booster diaphragm or leaking/blocked vacuum line; insufficient vacuum |
| Brake pedal feels spongy or slowly sinks to the floor | Worn master cylinder internal seals or hydraulic leakage |
| Hissing/whistling sound during braking | Damaged booster housing or diaphragm; vacuum leak |
| Engine idles rough or stalls when braking | Internal vacuum leak affecting engine intake manifold vacuum |
| Increased stopping distance | Booster unable to provide adequate assist |
| Visible brake fluid leakage (under pedal, around booster) | Worn/damaged master cylinder seals |
| Part Number | 8-97021942-2 8970219422 |
| Product Name | Brake Master Vacuum Assembly |
| Car Model | TFR54 |
| Engine Model | 4JA1 |
| Condition | 100% Brand New |
| Product Certifiion | ISO/TS16949 automotive quality management system |
| Product Net Weight | 2.9 kg |
| HS Code | 870830000 (Brake system parts) |
| Warranty | 3 months |
| Delivery Time | 15–20 days after payment confirmation |
Primary Vehicle Appliions:
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | TFR54 | 4JA1 | Pickup truck |
| ISUZU | TFS | 4JA1 | Pickup truck |
| ISUZU | D-MAX I (TFR/TFS) | 4JA1 | 1993–2003 Pickup truck |
| Packaging | Neutral box / Color box / Custom brand packaging |
| Quantity per package | 1 pc/box |
| Product Net Weight | 2.9 kg |
| Brand | IZUMI |
| Place of Origin | China |
| Minimum Order Quantity | Small quantities accepted |
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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