Air Suspension, Checking For Leaks

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Special tools and workshop equipment required

Air Suspension Leak Tester:VAS 751 001

Fig 1: Air Suspension Leak Tester
Courtesy of AUDI

The Air Suspension Leak Tester:VAS 751 001 is used to check for leaks in the air spring struts, the solenoid valve block, the pressure reservoirs, and the air lines.

Procedure

-- Disconnect the air line that runs to the component that will be tested from the solenoid valve block. Refer to COMPONENT LOCATION OVERVIEW - AIR SUSPENSION .

-- Connect the adapter -1- to the solenoid valve block -2-.

Courtesy of AUDI

-- Connect the adapter -3- to the corresponding air line -4-.

-- Connect the connecting cable -5- on the tester to the adapter -1-.

-- Switch on the tester -1-.

Courtesy of AUDI

-- Open both shut-off valves -A and B- at the Air Suspension Leak Tester:VAS 751 001 .

-- Fill the air suspension system. Refer to AIR SUSPENSION SYSTEM, FILLING AND BLEEDING .

-- Initiate and lock the standard vehicle height. Refer to STANDARD VEHICLE HEIGHT, INITIATING AND LOCKING .

-- Check the pressure gauge to see if the pressure is decreasing.

-- If the pressure is decreasing, then close the shut-off valve in the direction of the solenoid valve block.

If the pressure does not continue decreasing, then the cause is in the direction of the solenoid valve block. Refer to OVERVIEW - AIR LINES .

-- If the pressure continues to decrease, then check the air line connection at the affected component, such as the left from suspension strut, for leaks.

-- Disconnect the air line directly at the affected component, such as the left front suspension strut.

Follow the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .
Make sure that during the assembly work, no pressure points are created on the air suspension boot.
If the air line is removed from a component, check if the cutting ring is seated on the air line.

-- Remove the air line -2- on the residual pressure valve -3-. The air escapes from this.

Courtesy of AUDI

-- Connect the tester -1- between the component to be checked and the air line.

Courtesy of AUDI

-- Open both shut-off valves -A and B- at the Air Suspension Leak Tester:VAS 751 001 .

-- Fill the air suspension system. Refer to AIR SUSPENSION SYSTEM, FILLING AND BLEEDING .

-- Check the pressure gauge to see if the pressure is decreasing.

-- If the pressure is decreasing, then close the shut-off valve in the direction of the solenoid valve block.

If the pressure continues to decrease, then the component being tested is the cause. Refer to OVERVIEW - AIR LINES .
If the pressure does not continue decreasing, then the air line is the cause. Refer to AIR LINE, SERVICING .