Brakes and Traction Control: Testing and Inspection

34 00 009 Checking brakes on test stand





Necessary preliminary work:
^ Check tires for damage
^ Check tire treads
^ Checking tire inflation pressure





Important!
Make sure the Hill Descent Control (HDC) is not active before driving on to the brake test rig!
The Hill Descent Control (HDC) indicator light must not be on!

The brakes must be at normal operating temperature. To do so, gently warm up the brake discs and brake drums while dry by braking the vehicle several times.





Important!
Only brake test stands with test speeds of 2.5-6 km/h may be used.
Max. bedding-in time 2 minutes.
You must follow without fail the guidelines contained in the operating instructions of the relevant test stand manufacturer.
Failure to do so may result in damage to the vehicle and the system and also personal injury.

Front axle on brake test rig:

Important!
No gear or drive range must be engaged! Selector lever position "Neutral" on automatic transmission vehicles.
Do not press accelerator!
Disregard of these instructions will result in the transfer box engaging, forcing the vehicle off the brake test rig!

Drive vehicle on to brake test rig and carry out brake test.

Rear axle on brake test rig:

Important!
No gear or drive range must be engaged! Selector lever position "Neutral" on automatic transmission vehicles.
Do not press accelerator!
Disregard of these instructions will result in the transfer box engaging, forcing the vehicle off the brake test rig!

Drive vehicle onto brake test stand

The vehicle utilizes a plausibility check (wheel speed comparison) to detect the brake test rig within a few seconds and switches to brake test rig mode.

The parking brake indicator light flashes slowly when brake test stand mode is activated and parking brake actuators are released.

Following indicator lights are permanently on:
^ Parking brake
^ Brake system
^ Dynamic stability control (DSC)
^ Antilock Brake System ABS

Actuate parking brake switch = application of brake pads.

The parking brake indicator light flashes quickly when brake test stand mode is activated and parking brake actuators are partially locked.

Actuate parking brake switch = test force 1

Actuate parking brake switch again = test force 2

Actuate parking brake switch again = test force 3

The parking brake is released again when the button is actuated in the Release direction.

The parking brake indicator light is permanently activated when brake test stand mode is not detected and parking brake actuators are fully locked.

Brake test stand mode is automatically terminated when the vehicle is driven off the brake test stand.

All indicator lights go out automatically!