Bleeding the brake system (Mondeo 1)

When repairing brakes, which involved opening the system, air may get into the pipes, which must be removed from the system. The presence of air in the brake system can be judged by a "soft" brake pedal. In this case, eliminate the leak and bleed the brakes. Air is removed from the brake system by bleeding using the brake pedal. This operation requires two people. If it is necessary to remove air from the entire system, then each wheel cylinder is bled. This must be done if air has gotten into each brake cylinder. If only one brake caliper was replaced or repaired, then, as a rule, it is enough to remove air from the corresponding cylinder. You can also bleed each circuit separately. When removing air from the entire system, start bleeding from any front wheel, then bleed the cylinder of the rear wheel located on the other side of the car.



Unscrew the expansion tank cap and set it aside.



Remove the dust cap from the bleed screw. Clean the screw and place a clean hose on the screw head, dip the other end of the hose into a clear container half filled with brake fluid. On older cars, check the ease of unscrewing the screw beforehand.





Place the container with brake fluid at least 30 cm above the air bleed bolt. This will prevent air from entering the brake cylinder through the bolt thread.

One person frequently presses the brake pedal, "pumping" until pressure is created in the brake system. An increasing resistance of the brake pedal is felt.

Once sufficient pressure has been built up, keep the pedal depressed.

Loosen the air bleed bolt a little, half a turn, with a spanner. The fluid will flow into the container. Make sure that the end of the hose is always in the container in the brake fluid.

As soon as the liquid flows out, immediately tighten the bolt.

Repeat the pumping process.

Repeat the process in a separate cylinder until no more air bubbles come out of the hose.

Finally, carefully tighten the bleed screw with the brake pedal depressed to a torque of no more than 10 Nm.

Remove the hose from the bolt head and place the dust cap on the valve.

Bleed the other wheel cylinders in the same manner.

Attention! When bleeding the brakes, monitor the brake fluid level in the expansion tank. The fluid level should not drop too low, otherwise air will enter the hydraulic system through the expansion tank. Add only new brake fluid!

If necessary, add brake fluid up to the "MAX" mark.

Attention! The fluid level should not be above the "MAX" mark when the expansion tank cap is screwed in.

Screw the tank cap back on.

Attention, please perform a safety check:

• Is the brake hose connection tight?
• Is the brake hose secured in the holder?
• Is the air bleed bolt tightened?
• Is the brake fluid level in the expansion tank sufficient?

Check for leaks with the engine running. To do this, press the brake pedal with a force of 200-300 N (20-30 kg) and hold it for about 10 seconds. The pedal should not fall through. Check the tightness of all connections.

Finally, make a few braking attempts on a street with light traffic.