Replacing the master brake cylinder (Focus 2)

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You will need: TORX T25 keys, "13", "17"…

You will need: TORX T25 keys, «13», «17»…


…a special key for brake pipes "for 10".

…a special key for brake pipes «for 10».


1. Remove the tank cap…

1. Remove the tank cap…


2. …and pump out the brake fluid from the reservoir, for example, using a large medical syringe.

2. …and pump out the brake fluid from the reservoir, for example, using a large medical syringe.


3. Remove the battery mounting shelf (see "Removing and installing the battery mounting shelf").



3. Remove the battery mounting shelf (see «Removing and installing the battery mounting shelf»).


4. Disconnect the connector from the brake fluid level sensor…

4. Disconnect the connector from the brake fluid level sensor…


5. …and a hose to the clutch master cylinder from the brake master cylinder reservoir (see "Replacing the brake master cylinder reservoir").

USEFUL TIP: Immediately after disconnecting the hose from the reservoir, plug its opening without lowering the hose down. Some working fluid will remain in the hose, so after installing the reservoir and connecting the hose to it, there is no need to bleed air from the clutch release hydraulic drive.


HELPFUL TIP: Install a cap on the tank to prevent dirt from getting into it.


HELPFUL TIP: Install a cap on the tank to prevent dirt from getting into it.


6. Loosen the nuts securing the two pipes to the brake force regulators, holding the regulators from turning with a second key..



6. Loosen the nuts securing the two pipes to the brake force regulators, holding the regulators…


7. …nuts securing two pipelines to the main brake cylinder…

7. …nuts securing two pipelines to the main brake cylinder…


8. …and move the pipes to the side.

HELPFUL TIP: Seal the lines using any means available (such as by placing protective bleeder caps on the ends) to prevent brake fluid from escaping.


HELPFUL TIP: Seal the lines using any means available (such as by placing protective bleeder caps…


9. Unscrew the two nuts securing the master brake cylinder to the vacuum booster...



9. Unscrew the two nuts securing the master brake cylinder to the vacuum booster...


10. …and remove the master brake cylinder assembly with the reservoir.

10. …and remove the master brake cylinder assembly with the reservoir.


11. If the new master cylinder does not have a reservoir or there is a need to replace the rubber connecting bushings of the reservoir, unscrew the screw securing the reservoir to the master cylinder..

11. If the new master cylinder does not have a reservoir or there is a need to replace the rubber…


12. …remove the screw from the holes in the tank and cylinder…



12. …remove the screw from the holes in the tank and cylinder…


13. …and remove the tank, extracting its pipes from the connecting bushings.

14. If during operation a leak of brake fluid was observed through the connecting bushings, remove the bushings from the holes in the cylinder body.

WARNING: Do not reuse coupling bushings, replace with new ones.


WARNING: Do not reuse coupling bushings, replace with new ones.


15. Using a screwdriver, remove the rubber sealing ring from the body of the master brake cylinder.

CAUTION: Replace the master cylinder O-ring with a new one each time the connection is disassembled.


16. Install the brake master cylinder in the reverse order of removal, fill with brake fluid and bleed air from the system (see "Bleeding the hydraulic brake system").






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