Ford Workshop Service and Repair Manuals

The electronic parking brake actuator can only be replaced as a complete unit.

An electronic parking brake is available as an option for the vehicle. In comparison to a conventional handbrake, the electronic parking brake offers the following advantages:

• Ease of operation, as the electronic parking brake is always applied firmly, regardless of the strength of the driver.
• Safety, as the vehicle can be slowed down with the electronic parking brake if the hydraulics of the brake system fail while driving. The system is automatically coordinated with the ABS system to prevent the braked wheels from locking up.

The system comprises the following components:

• Pushbutton for operation of the electronic parking brake
• Emergency release mechanism
• Clutch pedal switch
• Electronic parking brake actuator
• Brake pedal switch

Pushbutton for operation of the electronic parking brake

The pushbutton for operation of the electronic parking brake is located in the centre console. To release the electronic parking brake press the pushbutton, to engage it pull the button.

Neutral position

When the pushbutton is in the neutral position, the following pins are connected to each other:

• 1 and 6
• 4 and 2
• 5 and 3

For safety reasons six change-over contacts which switch the three circuits are integrated in the pushbutton. The system will still function if one of the circuits fails. An error message then appears on the display of the instrument cluster.

Engaged position

When the pushbutton is in the engaged position, the following pins are connected to each other:

• 1 and 4
• 2 and 5
• 3 and 6

Released position

When the pushbutton is in the released position, the following pins are connected to each other:

• 1 and 5
• 4 and 3
• 2 and 6

Emergency release

If the electronic parking brake has been released by means of the emergency release mechanism then it is necessary to release the electronic parking brake via the pushbutton after the service repairs have been carried out.

It is also possible to release the electronic parking brake manually if required. There is a rubber mat underneath the storage compartment in the centre console which needs to be removed in order to access and operate the emergency release mechanism. The electronic parking brake is then released by firmly pulling the T-shaped handle upwards until a loud noise is heard.

• The electronic parking brake reinitialises itself during its first electrical operation after an emergency release.

Electronic parking brake actuator

The electronic parking brake actuator is positioned underneath the spare wheel well. The following components are integrated in the parking brake actuator:

• Electronic parking brake control module
• DC motor
• Transmission
• Force sensor
• Hollow shaft
• Splined shaft
• Handbrake cable
• Emergency release cable

Mechanical layout

The motor/gearing unit is a floating fit in the electronic parking brake actuator.

A hollow shaft is driven via the gearing. A splined shaft engages in turn in the hollow shaft. The hollow shaft is connected to a force sensor via a link which can be released mechanically (emergency release). The parking brake cables are hooked into the force sensor and the splined shaft.

After renewing the rear brake pads, always press the brake pedal several times before operating the electronic parking brake.

Operation

When the electronic parking brake is operated the DC motor is actuated using a map stored in the electronic parking brake control module. The values stored in the map are used as reference values. The voltage signal supplied from the force sensor is compared to the reference values. If the value matches the reference value then the DC motor is no longer actuated.

Engaging the parking brake

When the electronic parking brake is engaged, a distinction is made between static and dynamic braking. If the foot brake fails the vehicle can be braked dynamically by means of the electronic parking brake.

Dynamic braking

At speeds above 4 km/h the vehicle is gradually braked if the pushbutton is lifted up. If one of the braked wheels locks up then the force under which the parking brake cables are applied is reduced. The vehicle continues to brake while the button is pulled up.

Static braking

At speeds below 4 km/h or if the vehicle is stationary the pushbutton is lifted up briefly to engage the electronic parking brake.

If the ignition key is removed within 10 minutes of turning the ignition off, then the electronic parking brake is automatically engaged. The electronic parking brake control module switches to "sleep" mode 10 minutes after the ignition is switched off. It is then no longer possible to engage the electronic parking brake.

The automatic engagement of the electronic parking brake is configured separately for each different country at the factory. The automatic engagement of the electronic parking brake is disabled in countries where the handbrake cables are prone to freezing up. The automatic engagement of the electronic parking brake is enabled in all other countries. The automatic engagement of the electronic parking brake can be activated or deactivated with WDS according to the customer's wishes.

Releasing the parking brake

In order to release the parking brake, it is necessary for the ignition to be switched on, the pushbutton to be pressed and the brake pedal or clutch pedal to be depressed.

In order to prevent automatic engagement of the electronic parking brake when the ignition key is removed from the switch, press and hold the button while switching off the ignition and removing the key.