Check compressed-air system for leaks

AR42.60-W-0600B

Check compressed-air system for leaks

2.6.09



Checking

1

Park vehicle on a level surface and secure with wheel chocks to prevent it from rolling away

2

Connect test pressure gauge

 Required connections:

 Test connection for front axle single-circuit diaphragm brake cylinder (2)

 Test connection for reservoir pressure/tire filling connection ( 3)



*360589002100

3

Release parking brake

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

4

Start engine and completely inflate air brake system with idle speed

5

Switch off ignition

6

After 5 minutes using the brake pedal jack on the service brake, introduce a partial braking up to a pressure of approx. 3.5 bar

 Due to the technical equipment on the vehicle, a pressure drop can occur after switching off the engine, caused by ancillary consumers (e.g. due to the after-blowing process of the BlueTec exhaust aftertreatment system).

In order not to evaluate this pressure drop at the same time, the waiting time of 5 minutes must be maintained.

Getting in or out during the test should be avoided.



*000589183100

7

After 1 minute read off the pressure on the test connection for reservoir pressure/tire inflation connection (3)

 The waiting time is required in order not to evaluate at the same time possible pressure reductions due to the natural settling process of the compressed air components.

8

After another 3 minutes, read off the pressure on the test connection for reservoir pressure/tire inflation connection (3)

Permissible pressure loss

*BE42.10-N-1016-10B

 Is the pressure loss higher than permissible:



Identify and eliminate leakage.

9

Detach all test pressure gauges

Number

Designation

Model
930, 932, 933, 934, 944, 950, 952, 953, 954,
957

BE42.10-N-1016-10B

Permissible pressure loss when actuating brake system with 3.5 bar (measurement duration 3 min)

bar

0.4