ISUZU OEM Standard Brake Vacuum Booster with High-strength Steel Housing and 100,000+ Brake Cycle Durability for FTR113 FV515
| Part Type: | Vacuum Booster / Air Master Booster | Material: | High-strength Steel Housing + Aluminum Alloy Components |
| OEM Part Number: | 1-47800404-2 / 1478004042 | Associated Number: | 1-47800404-0 / 1478004040 |
| Right-Hand Version: | 1-47800404-AG / 147800404AG | Durability Validation: | 100,000 Brake Cycles |
| Vacuum Seal Testing: | 100% Vacuum Seal Testing | Compatible Models: | ISUZU FTR113, FV515 Heavy-Duty Trucks |
| High Light: | OEM Standard Brake Vacuum Booster,High-strength steel housing Brake Vacuum Booster,100,000+ Brake Cycle Durability Brake Vacuum Booster |
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The ISUZU Brake Vacuum Booster with OEM numbers 1-47800404-2 / 1478004042 is a precision-engineered replacement designed for ISUZU FTR113 and FV515 series heavy-duty trucks. This component is a core power amplification element of the vehicle's hydraulic brake/air-over-hydraulic brake system, responsible for amplifying the driver's braking force using engine intake manifold vacuum (or compressed air), making braking operations easier, more responsive, and reducing stopping distance.
The brake vacuum booster amplifies braking force using vacuum generated by the engine intake manifold during operation. The booster interior is divided by a diaphragm (or piston) into two chambers: one side connected to the engine intake manifold via a vacuum line (vacuum chamber), and the other side open to the atmosphere (atmospheric chamber). When the driver depresses the brake pedal, the push rod actuates the control valve, allowing atmospheric air to enter the atmospheric chamber. The resulting pressure differential pushes the diaphragm to generate an assist force, which combines with the driver's pedal force and transmits to the brake master cylinder, producing greater hydraulic pressure with less pedal effort.
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 blocked/leaking vacuum line; insufficient vacuum |
| Brake pedal feels spongy with increased travel; noticeably reduced braking force | Aged internal seals; reduced boosting effectiveness |
| Engine idles rough or stalls when brake pedal is pressed | Internal vacuum leak affecting engine intake manifold vacuum |
| Hissing sound during braking | Booster housing or diaphragm damaged; vacuum leak |
| Brake pedal fails to return or returns slowly | Stuck internal valve spool or failed return spring |
| Increased stopping distance | Booster unable to provide adequate assist |
| Part Number: | 1-47800404-2 1478004042 |
| Product Name: | Brake Vacuum Booster |
| Car Model: | FTR113 FV515 |
| Engine Model: | ISUZU |
| Condition: | 100% Brand New |
| Material: | High-strength aluminum alloy & precision bearings |
| Origin: | China Mainland |
- Product Certification: Manufactured under ISO/TS16949 automotive quality management system certification
- Manufacturer Background: Supplied by IZUMI brand with 18 years of experience
- Durability Validation: Tested for over 100,000 brake cycles to ensure long-term reliability
- Seal Integrity Testing: 100% vacuum seal testing on every unit
- Condition: Brand New — 100% quality inspected
- Warranty: 12-month quality guarantee
| Brand | Model Series | Chassis | Notes |
|---|---|---|---|
| ISUZU | FTR | FTR113 | Heavy-duty truck |
| ISUZU | FV | FV515 | Heavy-duty truck |
| ISUZU | FSR | — | Medium-duty truck (verify configuration) |
| ISUZU | FVR | — | Medium-duty truck (verify configuration) |
- Number Confirmation: This product number is 1-47800404-2 / 1478004042, belonging to the same series as 1-47800404-0 / 1478004040. A right-hand version 1-47800404-AG / 147800404AG also exists.
- Left vs. Right Side: Some sources indicate this product has Left-Hand (LH) and Right-Hand (RH) variations. Confirm installation position before ordering.
- Pair Replacement Recommended: When replacing the brake vacuum booster, it is recommended to inspect the brake master cylinder simultaneously.
- Vacuum Line Inspection: Inspect vacuum line and check valve for aging, cracks, or blockage when replacing the booster.
- Post-Installation Testing: Brake system function test is mandatory after installation.
- Professional Installation: The brake vacuum booster is a critical braking system safety component — professional installation is strongly recommended.
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