Brake test

AP42.00-P-4290MCC

Brake test

06.02.2019

Model

451.3/4, 453

Modification notes

24.03.2014

General brake test added.

General brake test (Only applies for countries without a specified brake test on the brake test stand)

1

Check braking behavior of service brake when driving


It must be ensured that the brake test when driving is performed as per the country-specific legislation and regulations.
Damage can occur otherwise.

 Press brake pedal uniformly.

With braking deceleration fluctuations or pulsating brake pedal:



Rectify problem subject to separate repair order.

With a difference in the service brake performance on the wheels on a single axle:



Check/correct tire pressure subject to separate repair order.

If the service brake performance difference remains even after repeat brake test on the wheels on a single axle:



Rectify problem subject to separate repair order.

The locking limit was not reached:



Subject to a separate repair order, check whether the brake values still comply with the legal regulations.

The specified minimum requirements and tolerance limits for the brake system must be fulfilled on a vehicle-specific basis in accordance with the country-specific legislation. If this is not the case:



Repair any complaints subject to separate repair order after performing diagnosis with the appropriate findings.

2

Check braking behavior of parking brake when driving


It must be ensured that the brake test when driving is performed as per the country-specific legislation and regulations.
Damage can occur otherwise.

The locking limit was not reached:



Subject to a separate repair order, check whether the brake values still comply with the legal regulations.

The specified minimum requirements and tolerance limits for the brake system must be fulfilled on a vehicle-specific basis in accordance with the country-specific legislation. If this is not the case:



Repair any complaints subject to separate repair order after performing diagnosis with the appropriate findings.

Brake test on brake test stand

 Danger

Risk of death caused by body parts being pulled in by rotating vehicle wheels and roller dynamometer rollers

Do not insert your hand into rotating parts. Wear closed and close-fitting work clothes.
Secure areas with rotating vehicle parts and test stand rollers against unauthorized access.
Secure roller dynamometer against unauthorized use.

AS00.00-Z-0019-01A

Notes on the evaluating and interpreting brake tests on test stands

AH42.00-N-0004-01S

3

Move vehicle with front axle into roller brake test stand



000 588 05 21 00 Roller brake test stand

WS42.00-P-0006B

4

Determine and document the braking characteristics and brake values of the front axle

 Press brake pedal uniformly. The maximum value prior to the wheels locking up is to be documented.

5

Move vehicle with rear axle into roller brake test stand



000 588 05 21 00 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 braking response and brake values of rear axle

 Press brake pedal uniformly. The maximum value prior to the wheels locking up is to be documented.

8

Determine and document braking response, brake values and actuating travel of parking brake

 Operate parking brake uniformly. The maximum values prior to the wheels locking up are to be documented.

9

Drive vehicle off the roller brake test stand

10

Evaluate braking response and documented brake values of service brake

Notes on the evaluating and interpreting brake tests on test stands

AH42.00-N-0004-01S

With braking deceleration fluctuations or pulsating brake pedal:



Rectify problem subject to separate repair order.

If the difference in the braking effect of the service brake at the wheels of an axle is more than 25 % of the highest value:



Check/correct tire pressure subject to separate repair order.

Repeat the brake test on a test stand, subject to a separate repair order.

If the service brake performance difference remains even after repeat brake test on the wheels on a single axle:



Rectify problem subject to separate repair order.

The locking limit was not reached:



Subject to a separate repair order, check whether the brake values still comply with the legal regulations.

The specified minimum requirements and tolerance limits for the brake system must be fulfilled on a vehicle-specific basis in accordance with the country-specific legislation. If this is not the case:



Repair any complaints subject to separate repair order after performing diagnosis with the appropriate findings.

11

Evaluate braking response and documented brake values of parking brake

With brake value fluctuations or pulsating actuation:



Rectify problem subject to separate repair order.

If the difference in the braking effect of the parking brake at the wheels of an axle is more than 50 % of the highest value:



Rectify problem subject to separate repair order.