What are the Methods of Brake Bleeding?

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Methods of Brake Bleeding:

The process is performed by forcing clean, bubble-free brake fluid through the complete system, usually from the master cylinder(s) to the calipers of disc brakes (or the wheel cylinders of drum brakes), but in certain cases within the opposite way. A brake bleed screw is often mounted at the very best point on each cylinder or caliper.

There are five main methods of bleeding:

    1. In the pump and hold method, the foot lever is pressed while one bleed screw at a time is opened, allowing air to flee. The bleed screw must be closed before releasing the pedal, or a one-way valve must be fitted.
    2. In the vacuum method, a pump is attached to the bleeder valve, which is opened and fluid extracted with the pump until it runs further from bubbles.
    3. In the pressure method, a pressure pump is attached to the hydraulic brake cylinder, pressurizing the system, and also the bleeder valves are opened one at a time until the fluid is evident of air. Specialized pumps may incorporate a technique to automatically keep the brake fluid reservoir full during bleeding.
    4. In the reverse method, a pump is employed to force fluid through the bleeder valve to the brake cylinder. This method uses the concept that air rises in liquid and naturally wants to flee up and out of the brakes.
    5. Gravity bleeding could be a simple and straightforward method to switch automotive brake fluid. It can even be wont to bleed systems containing air bubbles but might not be as effective as other methods.

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