Brake test

AP42.00-S-4290P

Brake test

09.10.2017

Model

470, 471

 Danger	Risk of death caused by limbs being caught or crushed by rotating parts when performing tests on the brake test stand	Never leave the vehicle unattended on the rollers except in an emergency. Ensure that no one is under the vehicle or near rotating parts during testing. In case of emergency, use the EMERGENCY OFF switch to shut down test stand.	AS42.00-Z-0001-01A
	Notes on the evaluating and interpreting brake tests on test stands		AH42.00-N-0004-01S
	General information on malfunctions in the brake system		AH42.30-N-2007-01A
	General brake test
1	Check braking characteristics of service brake and parking brake when driving	Only applies for countries without a specified brake test on the roller brake test stand.
			AP42.00-S-4290-01P
		 Make sure when driving that the brake test is performed as per the country-specific legislation and regulations. Otherwise, people may be injured or there may be damage to material and the environment.
	Brake test on roller brake test stand
2	Activate "Dynamometer test" menu in workshop menu on instrument cluster control unit
3	Move vehicle with front axle into roller brake test stand
	000 588 05 21 00 Roller brake test stand	Car brake test stand	WS42.00-P-0006B
	000 588 06 21 00 Roller brake test stand	Commercial vehicle brake test stand	WS42.00-N-0013B
		 The transmission must be in the idle position during the test.
4	Measure deceleration values of front service brake	 The permissible deviation from each larger value may not exceed 25 %. A braking effect must be discernible by the time the brake pedal has been depressed by a quarter of its overall travel distance. Malfunction or damage can occur otherwise.
		 Carry out test with engine running so that maximum vacuum is available. Press brake pedal uniformly. Document maximum values before wheels lock up.
		If deviations are present
		
		Determine and rectify cause subject to separate repair order.
5	Move vehicle with rear axle into roller brake test stand
	000 588 05 21 00 Roller brake test stand	Car brake test stand	WS42.00-P-0006B
	000 588 06 21 00 Roller brake test stand	Commercial vehicle brake test stand	WS42.00-N-0013B
		 The transmission must be in the idle position during the test.
6	Measure deceleration values of rear service brake	 The permissible deviation from each larger value may not exceed 25 %. A braking effect must be discernible by the time the brake pedal has been depressed by a quarter of its overall travel distance. Malfunction or damage can occur otherwise.
		 Carry out test with engine running so that maximum vacuum is available. Press brake pedal uniformly. Document maximum values before wheels lock up.
		If deviations are present
		
		Determine and rectify cause subject to separate repair order.
7	Measure deceleration values for mechanical parking brake	 The permissible deviation from each larger value may not exceed 50 %. When operating the parking brake, a braking effect must be noticeable after 3 to 4 notches. Malfunction or damage can occur otherwise.
		 Operate parking brake uniformly. Document maximum values before wheels lock up.
		If deviations are present
		
		Determine and rectify cause subject to separate repair order.
8	Drive the vehicle off the roller brake test stand
9	Deactivate "Dynamometer test" menu in workshop menu on instrument cluster control unit
10	Enter deceleration values of the service brake and parking brake in the maintenance sheet

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