Model: AST603
The AUTOOL AST603 Brake Bleeder Kit is an advanced automotive tool designed for efficient and precise brake fluid replacement. This device features a built-in vacuum pump, allowing for one-person operation and ensuring an air-free filling process. Its adjustable pressure control and durable construction make it suitable for professional garages and DIY enthusiasts alike. This manual provides detailed instructions for the safe and effective use of your AST603 Brake Bleeder Kit.
WARNING: Always read and understand all safety warnings and instructions before operating this tool. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.
Upon unpacking, please verify that all components listed below are present and undamaged:

Image: AUTOOL AST603 Brake Bleeder Kit with all components, including the main unit, various hoses, power cable, adapter, and recovery fluid bottle.

Image: Diagram illustrating the main components and their labels: Pressure Gauge, Power Indicator Light, Work Indicator Light, Start Button, Power Switch, Pressure Regulation Knob, Safety Device, Filling Hose, Pressure Balance Hose, Suction Hose, Power Cable, and Rear Base.
Prepare the Work Area:
Connect Hoses to Main Unit:
Prepare New Brake Fluid Bottle:
Connect Power:

Image: Step 1 of setup, showing the pressure balance hose and oil suction hose being placed into a new brake fluid bottle.
Follow these steps for a successful brake fluid exchange:
Initial Purge (Emptying the Device):

Image: Visual guide for purging the device: 1. Place new fluid reservoir. 2. Insert suction and pressure balance hoses. 3. Connect filling hose to old fluid reservoir. 4. Turn on power and press start. 5. Turn off power and remove adapter.
Connect to Vehicle:

Image: Step 2 of operation, showing the filling hose being connected to the brake fluid pump via the adapter fitting.

Image: Step 3 of operation, showing the recovery fluid bottle being connected to the brake wheel cylinder.
Adjust Pressure:

Image: Close-up of the adjustable knob and pressure gauge, indicating the pressure range of 0.5-2.5 Bar.
Start Bleeding Process:

Image: Depicts the AST603 unit with a hand pressing the start button, highlighting its one-person operation capability and air-free filling.

Image: Illustrates the automatic stop feature when brake fluid is insufficient and the automatic pressure reduction for high pressure protection.
Repeat for All Wheels:

Image: Shows two recovery bottles connected to two wheels, demonstrating the capability for faster brake fluid changes by replacing fluid on two tires simultaneously.
Completion:
Regular maintenance ensures the longevity and optimal performance of your AST603 Brake Bleeder Kit:
Cleaning:
Storage:
Inspection:

Image: Highlights the corrosion-resistant properties of the device's materials, ensuring long-term use.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | No power supply; Power cable not connected; Fuse blown. | Check power outlet; Ensure power cable is securely connected; Check and replace fuse if necessary. |
| No fluid flow or weak suction. | Hoses kinked or blocked; Insufficient new brake fluid; Air leak in connections. | Check hoses for obstructions; Refill new brake fluid; Tighten all connections. |
| Pressure not stable or too high/low. | Pressure adjustment knob incorrectly set; Internal pump issue. | Adjust pressure knob to desired range (0.5-2.5 bar); If problem persists, contact customer support. |
| Air bubbles continue to appear in fluid. | Air entering system through loose connections; Brake system still contains air. | Check and tighten all connections, especially at the vehicle's brake caliper; Continue bleeding until no bubbles are seen. |
| Feature | Detail |
|---|---|
| Model | AST603 |
| Power Supply | AC 110V |
| Working Pressure Range | 0.5 ~ 2.5 Bar |
| Maximum Power | 35W |
| Output Flow Rate | 1.6 L/min |
| Output Pressure | 0.7 ~ 2.5 Bar |
| Filling Hose Length | 3.5m |
| Low Oil Protection | Supported |
| Operating Temperature | -10°C ~ 60°C |
| Storage Temperature | -10°C ~ 65°C |
| Product Weight | 5.19 kg (approx. 11.44 lbs) |
| Product Dimensions | 12 x 12 x 14 inches (approx. 30.5 x 30.5 x 35.6 cm) |

Image: Diagram showing the dimensions of the AST603 unit and a table summarizing its technical specifications.
AUTOOL provides a comprehensive warranty and dedicated customer support for the AST603 Brake Bleeder Kit.
This product comes with a Three Years Warranty. In case of any quality problems or defects with your AST603, AUTOOL is committed to providing a new replacement or suitable solutions to ensure customer satisfaction without delay.
Lifetime technical support is provided for this product. For any technical assistance, operational queries, or troubleshooting guidance, please do not hesitate to contact AUTOOL customer service. We aim to respond to all inquiries within 24 hours.
For support, please refer to the contact information provided on the official AUTOOL website or your purchase documentation.
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