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Park Brake|Specifications > < Electronic Parking Brake Control Module Description

Astra J

Park Brake System Description and Operation

Table 1: Static Apply/Release
Note:  Plastic coated park brake cables do not need periodic lubrication.

Coated park brake cables are used to reduce apply effort and increase corrosion protection. The cables are coated with a plastic material which slides against nylon seals inside the conduit end fittings.

Mechanical Park Brake System

The park brake lever has an indicator switch which closes when the park brake is set, thus illuminating the red BRAKE lamp.

Park brake application is completely independent of the hydraulic brake system. The park brake system is a mechanical system which operates the rear disc brakes through the calipers. The system is activated by pulling the park brake lever upwards, which applies the rear disc brakes via cables. A mechanical stop in the lever will hold the lever in the chosen position. When the park brake is set and the ignition switch is on, the Park Brake warning lamp on the instrument panel will be on. The park brake is released by pushing the knob on the underside of the lever, raise it a few millimeters and then push it downwards to its lowest position. When the lever reaches its lowest position the Park Brake lamp in the instrument cluster will go out.

Electronic Park Brake System

In the electronic park brake (EPB) system the brake cables are pulled by the motor in the electric park brake control module (EPBCM). Refer to Electronic Parking Brake Control Module Description .

Instead of a park brake lever there is an electric switch in the mid-console. By pulling the switch upwards the park brake is activated and the park brake warning lamp in the IPC is illuminated. By pushing it downwards the park brake is released and the warning lamp goes out.

The motor in the EPCM pulls the cable to the right-hand rear wheel caliper. An equalizer is mounted on the cable and pulls the cable to the left-hand rear wheel.

The function is divided into:

•  Static apply/release
•  Dynamic apply/release
•  Automatic release

Static Apply/Release


Initial Vehicle Condition
Action Taken
Result

EPB released. Key in "Off". Remove key and wait at least 30 seconds for the Bus to go to sleep
Pull up switch
•  EPB applies
•  Red tell-tale illuminates


EPB applied - Key in "Off"
Push down switch
No operation

EPB applied - Key in "Off", brake pedal pressed
Push down switch
No operation

EPB applied - Key in "Acc"
Push down switch
•  EPB does not release
•  DIC display = Press Brake Pedal to Release Park Brake
•  Chime sounds


EPB applied - Key in "Acc", brake pedal pressed
Push down switch
•  EPB releases
•  Red tell-tale turns off


EPB applied - Key in "Run"
Push down switch
•  EPB does not release
•  DIC display = Press Brake Pedal to Release Park Brake
•  Chime sounds


EPB applied - Key in "Run", brake pedal pressed
Push down switch
•  EPB releases
•  Red tell-tale turns off


EPB released - Key in "Run"
Pull up switch
•  EPB applies
•  Red tell-tale illuminates


EPB released - Key in "Acc"
Pull up switch
•  EPB applies
•  Red tell-tale illuminates


EPB applied - Key in "Acc"
Key is turned to "Off"
Park Brake Set DIC message disappears after delay

Engine on, speed above 15 km/h
Pull up switch and HOLD
•  If cruise control is on, cruise is disabled
•  ESC controlled deceleration down to 6 km/h (4 mph)
•  Red tell-tale illuminated
•  Brake light applied
•  Continuous chime above 15 km/h (9 mph)
•  DIC display = Release Park Brake Switch (above 15 km/h (9 mph))
•  EPB static apply below 6 km/h (4 mph)
•  DIC display = Park Brake Set
•  Red tell-tale remains illuminated


Engine on, speed between 6-15 km/h
Pull up switch and HOLD
•  ESC controlled deceleration down to 6 km/h (4 mph)
•  Red tell-tale illuminated
•  Brake light applied
•  No chime during vehicle motion
•  No DIC message during vehicle motion
•  EPB static apply below 6 km/h (4 mph)
•  DIC display = Park Brake Set
•  Red tell-tale remains illuminated


Engine on, speed above 15 km/h
Pull up switch and HOLD for a couple of seconds, then release
ESC controlled stop releases when button is let go; also tell-tale, brake light, chime and DIC do go off after brief delay

ESC dynamic deceleration failed, but wheel speed available and pump working, vehicle speed above 15 km/h
Pull up switch and HOLD
•  If cruise control is on, cruise is disabled
•  ESC controlled deceleration down to 6 km/h (4 mph)
•  Red tell-tale illuminated
•  Brake light applied
•  Continuous chime above 15 km/h (9 mph)
•  DIC display = Release Park Brake Switch (above 15 km/h (9 mph))
•  EPB static apply below 6 km/h (4 mph)
•  DIC display = Park Brake Set
•  Red tell-tale remains illuminated


No wheel speed signals/ESC bus messages not valid, vehicle speed above 15 km/h
Pull up switch and HOLD for at least 5 seconds, then release
•  EPB Slow Ramp Up to specified force
•  Red tell-tale illuminated
•  Brake light applied
•  No chime because of missing speed signal
•  No DIC display
•  EPB statically applied after 5 seconds of continuous Apply button activation
•  DIC display = Park Brake Set
•  Red tell-tale remains illuminated


No brake pedal initial travel achieved signal/signal not valid, vehicle stopped, key in "Run", foot NOT on brake pedal. EPB applied.
Push down switch for at least 2 seconds
EPB releases after holding down switch for 2 seconds

Manual gearbox, engine on, brake pedal pressed. EPB applied.
Foot released from brake pedal

Push accelerator pedal to drive away forward/backward
EPB releases for a smooth drive away. Regulates according to steepness. Can hold car up to 5 minutes.
 

Park Brake|Specifications > < Electronic Parking Brake Control Module Description