Lubricants, fluids, sealants and adhesives
| Position | Specification |
| Sealant for clutch slave cylinder | ESK-M4G269-A |
| Brake fluid (Super DOT 4) | ESD-M6C57-A |
Clutch controls
| Drive unit | Hydraulic |
| Adjustment | Automatic |
| Pedal travel (not adjustable) | 133±3mm |
Torque specification
| Name | Nm | lb-ft | lb-in |
| Clutch Master Cylinder Bolts | 9 | 80 | |
| clutch slave cylinder | 10 | 89 |
Elements of the clutch mechanism
| Pos. | Spare Part No | Name |
| 1 | Brake fluid level switch | |
| 2 | Brake fluid reservoir | |
| 3 | Supply pipeline | |
| 4 | Clutch Master Cylinder | |
| 5 | clamps | |
| 6 | High pressure pipeline | |
| 7 | Clutch slave cylinder with integrated clutch release bearing | |
| 8 | Air removal nipple |
The Focus is equipped with a hydraulic clutch, similar to the one used on the 1997 Mondeo. The brake fluid reservoir has a separate chamber containing brake fluid for the hydraulic clutch.
When the clutch pedal is depressed, the pressure in the clutch master cylinder increases, and the built-in clutch release bearing in the clutch slave cylinder is activated. The advantages of hydraulic clutch actuation are as follows:
- Automatic adjustment
- Less working force
- Small wear
Compared to the 1997 Mondeo, the following points have been changed:
- Ports for bleeding and supplying pressure on the clutch slave cylinder
- Ports on clutch master cylinder
- No preload valve; preload is created by the spring
- Lack of clutch pedal travel adjustment
Tank
The brake fluid reservoir contains brake fluid for the hydraulic clutch and brake system.
The tank has two separate chambers: for the hydraulic clutch and the brake system. If there are leaks in the hydraulic clutch, the brake system continues to operate normally.
Clutch Master Cylinder
The clutch master cylinder generates the pressure required to engage the clutch.
When the brake pedal is depressed, the piston rod moves the clutch master cylinder piston. The hydraulic fluid in the clutch master cylinder is pressurized through a high pressure line to the clutch slave cylinder.
Clutch slave cylinder
Central clutch slave cylinder with integrated thrust bearing (clutch release bearing) is attached to the clutch housing with three bolts. The thrust bearing is installed in the clutch slave cylinder by an interference fit.
Hydraulic fluid supplied by the clutch master cylinder piston moves the piston in the clutch slave cylinder, which in turn moves the clutch release bearing axially. The inner ring of the clutch release bearing presses on the tabs of the diaphragm spring. The clutch between the clutch disc and the flywheel is broken.
After releasing the clutch pedal, the diaphragm spring returns the clutch slave cylinder piston to its original position. The clutch between the clutch disc and the flywheel is restored.
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