ISO/TS16949 Certified Brake Master Vacuum Assembly for ISUZU TFR54 4JA1 — Brand New 100% Quality Inspected
| Product Net Weight: | 2.9 Kg | Part Type: | Vacuum Booster + Brake Master Cylinder Integrated Assembly |
| Compatible Engine: | ISUZU 4JA1 | Compatible Model: | ISUZU TFR54 |
| Material: | High-strength Aluminum Alloy & Precision Bearings | Cooling Type: | Engine Coolant Circulation |
| Installation Position: | Engine Bay Firewall / Between Brake Pedal And Brake Lines | Quantity per package: | 1 Pc/box |
| 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 |
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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 amplification 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 Certification | 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 Applications:
| 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 |
- Number Confirmation: This product number is 8-97021942-2 / 8970219422. The series also includes 8-97021942-0 / 8970219420 and 8-97021942-1 / 8970219421. Verify the specific number on the original part before ordering.
- Assembly Note: This product is an integrated Master Vac Assembly (master cylinder + vacuum booster) — replace as a complete unit.
- Pair Replacement Recommended: When replacing the assembly, it is recommended to replace brake fluid simultaneously and inspect brake lines and wheel cylinders/calipers.
- System Bleeding Required: After installation, brake system bleeding is mandatory — start from the farthest wheel (right rear) to remove air from lines.
- Vacuum Line Inspection: Inspect vacuum line and check valve for aging, cracks, or blockage when replacing the assembly — replace if necessary.
- Installation Torque: Refer to ISUZU factory workshop manual for mounting bolt and brake line fitting torque specifications.
- Professional Installation: The brake master vacuum assembly is a critical braking system safety component — professional installation is strongly recommended.
Integrated design ensures perfect alignment between booster and master cylinder — eliminates fitment errors of separate components; faster, more reliable brake response; easier installation.
Internationally recognized automotive industry quality standard — ensures full-process quality control from design to production — supplied by IZUMI brand.
Utilizes engine intake manifold vacuum to amplify braking force — significantly reduces brake pedal effort; improves driving comfort and braking safety.
Ensures stable hydraulic pressure transmission and reliable vacuum sealing — effectively reduces stopping distance and enhances driving safety.
Every piece undergoes strict quality inspection — ensures zero-defect delivery.
Replaces OEM numbers 8-97021942-2 / 8970219422; compatible with 8-97021942-0, 8-97021942-1, 834-05301 — fits TFR54, TFS, D-MAX models.
Flexible MOQ with small quantity orders accepted — delivery time 15–20 days.
| 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 |
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