Two-Wheel Brake Fluid Exchange on Battery Power
The AUTOOL AST612 runs from the vehicle’s 12 V battery, delivers fresh brake fluid with pulsating pressure and collects used fluid from two wheel positions at once, so one person can do the job without mains power.
- 2 Wheels at Once
- 12 V DC
- 2.6 L/min
- 9 Adapter Types
- Auto Pressure Release
Key Features
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Pulsating Fluid Exchange
Pulsating pressure feeds the reservoir while used fluid drains from each caliper until new fluid appears, reducing the risk of bubbles compared with basic pressure filling.
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Single-Person Operation
No helper is needed to pump the brake pedal, and the engine does not need to run.
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Two Wheels Simultaneously
Two 1.5 L recovery bottles let you service two wheel positions in one pass.
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Automatic Pressure Release
When the exchange is complete, pressure is released automatically in about 30 seconds to reduce splashing.
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Air-Ingress Protection
If pressure cannot build or the pump draws air, the pressure monitor shuts the unit down to keep air out of the reservoir.
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Compact, Organized Body
Top carry handle, side hose hook and rear bottle base; the front panel groups the pressure gauge, indicators and buttons.
AST612 vs AST618
| AST612 | AST618 | |
|---|---|---|
| Wheels serviced at once | 2 | 4 |
| Bottles | 2 × 1.5 L used, 1 L new | 4 × 1.5 L used, 3 L stainless steel |
| Adapters | 9 types | 17 types |
| Maximum flow | 2.6 L/min | 1.6 L/min |
| Pressure relief time | 30 s | 10 s |
| Pulse and working-time settings | No | Yes |
| Working pressure | 1.5–3.0 bar | 0.6–3.0 bar |
| Casters and telescoping handle | No | Yes |
What’s in the Box
- AST612 brake fluid bleeder
- Two 1.5 L used-fluid recovery bottles
- 1 L fresh-fluid storage bottle
- 12 V battery-clamp cable
- 3.5 m filling hose and related hoses
- Nine reservoir adapters
- User manual
How to Use
- Prime the line (first use)Fill the delivery line with the specified brake fluid and bleed out the air before connecting to a vehicle.
- Add brake fluidFill the storage bottle with new fluid.
- Connect the bottle hosesAttach the suction hose and pressure-balancing hose to the storage bottle.
- Connect the batteryClamp the cable to the vehicle’s 12 V battery.
- Fit the adapterConnect the filling hose to the matching adapter and seal it on the brake fluid reservoir.
- Attach the recovery bottlesConnect the used-fluid bottles to the caliper bleed points.
- StartSwitch on and press Start, then follow the vehicle’s wheel sequence.
Full operating and troubleshooting steps: AST612 user manual (PDF).
Good to Know
Caution
- The regulator is factory set to 1–1.5 bar to protect the storage chamber and seal. Avoid excessive pressure, which may damage the brake master cylinder.
- Air left in the machine’s line can interrupt the exchange; prime it before first use.
- Check the reservoir adapter, cap and hoses for leaks before building pressure.
Care
- Brake fluid can damage paint; clean spills immediately.
- Keep the fresh-fluid filler port clean and inspect the hoses for damage before each job.
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