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Operations IW4/IW7 WB/WBV
24 D1 0412BA1-GB04
3.5.3 Maximum Brake Force Test
On test stands with brake force application limiter (optional), the motors switch
off automatically if the brake pedal was depressed too fast, and/or the brake
force application limiter warning lamp lights up. In this case the vehicle must
be braked until the wheels block or, if this is not possible, the vehicle must exit
the roller set. Once the Ready-lamp lights up after the roller set is re-occupied
the brake force application limiter warning lamp will extinguish. Now the
test can be repeated. Make sure that braking is done slowly and constantly.
! Depress brake pedal completely.
Depress brake pedal slowly and evenly.
! Observe the instruments on the display panel
Observe the pointer instruments on the display cabinet. The pointers of the brake forces
should move forward corresponding to the applied pedal force.
! Terminate the measurement
As soon as one wheel has reached a slip of 30%, both rollers will be switched off. Now the
maximum brake force has been reached. This value will be displayed by the needles until the
motors are restarted (needle stop). Should the motor not switch off inspite of maximum pedal
force, the brake force reached at maximum pedal force is the maximum brake force.
On test stands equipped with a brake force application limiter (optional) the red "Application
limiter" lamp will be lit if the brake pedal is depressed too fast. In this case the test will have to be
repeated.
The ratio of maximum brake force of the service brake to the weight of the vehicle should not be
less than the legally permissable min. brake force!
Never drive a driven axle from the roller set unless both motors are running and the yellow
ready lamp is lit. This could lead to serious damage to the electrical and mechanical system of
the test stand!
Brake Test
Fig. 3-8: Running a Brake Test