Pressure Accumulator, Checking

Pressure Accumulator, Checking

Note: Leak test is best performed on a lifting platform with ramp or over a pit

^ Remove dust cap from one of the bleeder screws -item 76, Refer to Suspension Control ( Automatic - Electronic Level ), Service and Repair.
^ Attach bleeder hose of pressure tester VAG 1354 to bleeder screw.
^ Open bleeder screw, use suitable container to collect hydraulic fluid which emerges.
^ Attach bleeder screw to connector.
^ Pull bleeder hose off bleeder screw on connector and attach to bleeder screw of pressure tester.

Checking right pressure accumulator
^ Remove pressure line -item 56 - from connector -item 77, Refer to Suspension Control ( Automatic - Electronic Level ), Service and Repair.
^ Connect pressure tester VAG 1354: 15 Nm (111 ft. lbs.).
^ Disconnect connecting link of control valve item 87 - from lever -item 80 -, this involves removing nut -item 86, Refer to Suspension Control ( Automatic - Electronic Level ), Service and Repair.
^ Adjust linkage in direction of travel.
^ Allow engine to idle.
^ Observe reading on pressure gauge, switch off ignition at approximately 30 bar.
^ Carefully open bleeder screw of pressure tester VAG 1354 until pressure gauge pointer slowly drops.
^ Use suitable container to collect hydraulic fluid emerging.

Notes:
^ The point at which the pressure stops dropping slowly and abruptly drops to 0 bar is the charging pressure of the pressure accumulator.
^ Specified value: 15 to 25 bar.

Checking left pressure accumulator
^ Remove pressure line at disconnection point on right rear longitudinal member -item 52 and -item 71, Refer to Suspension Control ( Automatic - Electronic Level ), Service and Repair.
^ Connect pressure tester VAG 1354: 15 Nm (11 ft. lbs.).
^ Further testing is the same as for the right accumulator.
^ After completing test, attach dust cap to bleeder screw at connector and check hydraulic fluid level on unladen vehicle, Top up fluid if necessary.

Note: If charging pressure is close to minimum pressure (15 bar or 217.5 psi) e.g. left pressure accumulator 15 bar and right accumulator 16.5 bar (239 psi), it is advisable to replace both spring cylinders.