Brake test

AP42.00-P-4290BA

Brake test

14.03.2019

Model	117, 118, 124, 129, 140, 156, 163, 164, 166, 167, 168, 169, 170, 171, 172, 176, 177, 190, 197, 199, 202, 203, 204, 205, 207, 208, 209, 210, 211, 212, 213, 215, 216, 217, 218, 219, 220, 221, 222, 230, 231, 238, 240, 242, 245 (except 245.286), 246, 247, 251, 253, 257, 290, 292, 293
Model	463
	as of model year 2019

	General brake test (Only applies for countries without a specified brake test on the roller brake test stand)
1	Check braking behavior of service brake when driving.	 When carrying out the brake test while driving, ensure that this is done in accordance with the country-specific legislation and regulations. Otherwise, people may be injured or there may be damage to material and the environment.
		 Press brake pedal uniformly.
		In event of braking deceleration fluctuations or a pulsating brake pedal,
		
		determine cause and correct.
		 After obtaining special order.
		In event of any difference in service brake performance on wheels on a single axle.
		
		Check and correct tire pressure.
		 After obtaining special order.
		If the service brake performance difference remains even after repeat brake test on the wheels on a single axle.
		
		determine cause and correct.
		 After obtaining special order.
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		If the specified minimum requirements and tolerance limits for the brake system are not fulfilled in accordance with the country-specific legislation.
		
		determine cause and correct.
		 After obtaining special order.
2	Check braking characteristics of parking brake when driving at  4 km/h ( 2.5 mph).	 When carrying out the brake test while driving, ensure that this is done in accordance with the country-specific legislation and regulations. Otherwise, people may be injured or there may be damage to material and the environment.
		 Electrically operated parking brakes are only active at a speed of  4 km/h ( 2.5 mph).
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		If the specified minimum requirements and tolerance limits for the brake system are not fulfilled in accordance with the country-specific legislation.
		
		determine cause and correct.
		 After obtaining special order.
	Brake test on roller brake test stand
 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
3.1	Set hydraulic valve or electrical selection switch in engine compartment to "TEST" position.	Model 124.226/230/290/330/333/393
		 Ignition is switched off.
3.2	Switch on dynamometer test using steering wheel buttons.	Model 197
		Model 197.3/4	AR54.30-P-1000-02QQ
		 Do not switch off ESP® using the ESP® Sport OFF button on the center console. Otherwise, an active intervention by the ESP® brake system may lead to measurement errors.
4	Perform gear ratio change from "High" to "Low".	Model 164, 166 with code 430 (Offroad package) Model 463 as of model year 2019 with code ZB4 (Off-Road package)
		 To do so, press the "Low Range" button on the lower control panel and drive for 20 to 50 meters to shift from the "High" on-road ratio into the "Low" step-down ratio. If "Sport" transmission mode has been activated, it is not possible to shift to the "Low" step-down ratio.
5	Move vehicle with front axle onto roller brake test stand.
			WS42.00-P-0006B
6	Move automatic transmission to selector lever position "N" or shift manual transmission to neutral.
7	Determine and document the braking characteristics and brake values of the front axle.	 On all-wheel drive vehicles, the speed of the roller brake test stand rollers may be max. 5 km/h and may not last for longer than 15 s per test of one axle. Between the tests, a waiting period of at least 15 s must be observed, during which the axle may not be driven by the roller brake test stand rollers. The drive train and brake system can otherwise be damaged.
		 Press brake pedal uniformly. Document maximum values before wheels lock.
8	Move rear axle of vehicle into roller brake test stand.
			WS42.00-P-0006B
9	Move automatic transmission to selector lever position "N" or shift manual transmission to neutral.
10	Determine and document braking characteristics and brake values of rear axle.	 On all-wheel drive vehicles, the speed of the roller brake test stand rollers may be max. 5 km/h and may not last for longer than 15 s per test of one axle. Between the tests, a waiting period of at least 15 s must be observed, during which the axle may not be driven by the roller brake test stand rollers. The drive train and brake system can otherwise be damaged.
		 Press brake pedal uniformly. Document maximum values before wheels lock.
11.1	Determine and document braking response, brake values and actuating travel of parking brake.	Vehicles with mechanically actuated parking brake.
		 Operate parking brake uniformly. Document the number of notches and the maximum values prior to the wheels locking up.
11.2	Determine and document braking characteristics and brake values for electric parking brake.	Model 197, 216, 221 Vehicles with electrically-operated parking brake.
		 On all-wheel drive vehicles, the speed of the roller brake test stand rollers may be max. 5 km/h and may not last for longer than 15 s per test of one axle. Between the tests, a waiting period of at least 15 s must be observed, during which the axle may not be driven by the roller brake test stand rollers. Before operating the electric parking brake, the rear-axle complete wheels must be driven by the roller brake test stand until the vehicle has detected the roller brake test stand so that application of the brake pads is then slowed down. Otherwise damage may occur.
		 Briefly press switch of electric parking brake once, do not press and hold. Otherwise damage will occur.
		 Document maximum values before wheels lock.
11.3	Determine and document braking characteristics and brake values for electric parking brake.	Model 117, 118, 156, 166, 167, 172, 176, 177, 190, 205, 213, 217, 222, 231, 238, 242, 246, 247, 253, 257, 290, 292, 293 Model 463 as of model year 2019 Vehicles with electrically-operated parking brake.
		 On all-wheel drive vehicles, the speed of the roller brake test stand rollers my be max. 5 km/h and may not last for longer than 15 s per test of one axle. Between the tests, a waiting period of at least 15 s must be observed, during which the axle may not be driven by the roller brake test stand rollers. Before operating the electric parking brake, the rear-axle complete wheels must be driven by the roller brake test stand until the vehicle has detected the roller brake test stand so that application of the brake pads is then slowed down. Otherwise damage may occur.
		 The electric parking brake brakes briefly and then changes to the roller brake test stand mode.  After 3 s press the switch of the electric parking brake again briefly, the electric parking brake brakes with greater brake power.  If necessary, after 3 s briefly press the switch of the electric parking brake a 3rd and a 4th time until the wheels lock up.
		 Document maximum values before wheels lock.
12	Release parking brake and drive vehicle out of roller brake test stand.
13	Evaluate braking characteristics and documented brake values of service brake.
	Notes on the evaluating and interpreting brake tests on test stands		AH42.00-N-0004-01S
		If there are brake value fluctuations or a pulsating brake pedal or if the difference in the braking effect of the service brake at the wheels of one axle is more than 25 % of the highest value,
		
		determine cause and correct.
		 After obtaining special order.
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		 The stated deviation applies for the Federal Republic of Germany; differently phrased country-specific regulations must be observed accordingly.
		If the brake values do not meet legal requirements,
		
		determine cause and correct.
		 After obtaining special order.
14.1	Evaluate braking characteristics and documented brake values of parking brake.	Vehicles with mechanically actuated parking brake.
		If there are brake value fluctuations, pulsating operation or if the difference in the braking effect of the parking brake at the wheels of one axle is more than 50 % of the highest value,
		
		Bed in the parking brake as per the specification.
		Model 124, 129, 140, 163, 164, 168, 169, 170, 171, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 218, 219, 220, 230, 240, 245 (except 245.286), 251	AP42.20-P-4290-01BA
		 After obtaining special order.
		MODEL 129 with duo servo brakeNumber of notches at which the parking brake must be adjusted if up to that point there is insufficient braking effect	*BE42.20-P-1005-01A
		Model 124, 140, 163, 164, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 218, 219, 220, 230, 240, 251Number of notches by which the foot-operated parking brake has to be adjusted, if until then there is no adequate braking effect	*BE42.20-P-1001-02A
		Model 168, 169, 170, 171, 245 (except 245.286)Number of notches by which the hand brake has to be adjusted, if until then there is no adequate braking effect	*BE42.20-P-1002-02A

		
		Repeat brake test on roller brake test stand.
		 After obtaining special order.
		If the problem persists during the repeated roller brake test stand
		
		determine cause and correct.
		 After obtaining special order.
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		 The stated deviation applies for the Federal Republic of Germany; differently phrased country-specific regulations must be observed accordingly.
		If the brake values do not meet legal requirements,
		
		determine cause and correct.
		 After obtaining special order.
14.2	Evaluate braking characteristics and documented brake values of parking brake.	Model 197, 216, 221 Vehicles with electrically-operated parking brake.
		If there are brake value fluctuations, pulsating operation or if the difference in the braking effect of the parking brake at the wheels of one axle is more than 50 % of the highest value,
		
		Condition parking brake as per the specifications.
		Model 216 Model 221.0/1	AR42.20-P-0530-02SX
		Model 197	AR42.20-P-0530-02RQ
		 After obtaining special order.
		Repeat brake test on roller brake test stand.
		If the problem persists during the repeated roller brake test stand
		
		determine cause and correct.
		 After obtaining special order.
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		 The stated deviation applies for the Federal Republic of Germany; differently phrased country-specific regulations must be observed accordingly.
		If the brake values do not meet legal requirements,
		
		determine cause and correct.
		 After obtaining special order.
14.3	Evaluate braking characteristics and documented brake values of parking brake.	Model 117, 118, 156, 166, 167, 172, 176, 177, 190, 205, 213, 217, 222, 231, 238, 242, 246, 247, 253, 257, 290, 292, 293 Model 463 as of model year 2019 Vehicles with electrically-operated parking brake.
		If there are brake value fluctuations, pulsating operation or if the difference in the braking effect of the parking brake at the wheels of one axle is more than 50 % of the highest value,
		
		determine cause and correct.
		 After obtaining special order.
		If locking limit is not reached:
		
		Check whether the brake values still comply with the legal regulations.
		 After obtaining special order.
		 The stated deviation applies for the Federal Republic of Germany; differently phrased country-specific regulations must be observed accordingly.
		If the brake values do not meet legal requirements,
		
		determine cause and correct.
		 After obtaining special order.
15.1	Set hydraulic valve or electrical selection switch in engine compartment to "Function" position.	Model 124.226/230/290/330/333/393
		 Ignition is switched off.
15.2	Switch off dynamometer test using steering wheel buttons.	Model 197
		Model 197.3/4	AR54.30-P-1000-02QQ

Adjustment values for parking brake during maintenance operations

Number	Designation		Model 124, 140, 163, 164, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 218, 219, 220, 230, 240, 251
BE42.20-P-1001-02A	Number of notches by which the foot-operated parking brake has to be adjusted, if until then there is no adequate braking effect	Anzahl	7

Adjustment values for parking brake during maintenance operations

Number	Designation		Model 168, 169, 170, 171, 199, 245
BE42.20-P-1002-02A	Number of notches by which the hand brake has to be adjusted, if until then there is no adequate braking effect	Anzahl	5

Test values for parking brake

Number	Designation		Model 129 up to 9/30/89 with duo servo brake	Model 129 as of 10/1/89 with duo servo brake
BE42.20-P-1005-01A	Number of notches at which the parking brake must be adjusted if up to that point there is insufficient braking effect		4	5

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