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.
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.
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.
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
|
| • | 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
|
| • | DIC display = Press Brake Pedal to Release Park Brake |
|
EPB applied - Key in "Acc", brake pedal pressed
| Push down switch
|
| • | Red tell-tale turns off |
|
EPB applied - Key in "Run"
| Push down switch
|
| • | DIC display = Press Brake Pedal to Release Park Brake |
|
EPB applied - Key in "Run", brake pedal pressed
| Push down switch
|
| • | Red tell-tale turns off |
|
EPB released - Key in "Run"
| Pull up switch
|
| • | Red tell-tale illuminates |
|
EPB released - Key in "Acc"
| Pull up switch
|
| • | 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 [sime ]6 km/h (4 mph) |
| • | Red tell-tale illuminated |
| • | Continuous chime above 15 km/h (9 mph) |
| • | DIC display = Release Park Brake Switch (above 15 km/h (9 mph)) |
| • | EPB static apply below [sime ]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 [sime ]6 km/h (4 mph) |
| • | Red tell-tale illuminated |
| • | No chime during vehicle motion |
| • | No DIC message during vehicle motion |
| • | EPB static apply below [sime ]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 [sime ]6 km/h (4 mph) |
| • | Red tell-tale illuminated |
| • | Continuous chime above 15 km/h (9 mph) |
| • | DIC display = Release Park Brake Switch (above 15 km/h (9 mph)) |
| • | EPB static apply below [sime ]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 |
| • | No chime because of missing speed signal |
| • | 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.
|
