Service Information: Changes to maintenance, filling and repair of pressure reservoir in pump module

W14.40-1527-06

1 Pump module

2 Filler connection for pressure reservoir

3 Drain button

4  Pump

A Previous version

5 Valve element

6 Valve cap

7 Protective cap

B New version

8 Valve element

9 Valve cap (with seal)

Change to pressure reservoir of pump module

Since 03/2010 a revised pressure reservoir has been available through the GLC. This is equipped with a modified valve element (8) and a modified valve cap (9) with inner seal; apart from this the reservoir bladder is filled with silicon pellets.

New filling and testing method

Feedback from the workshop has revealed that the current method of filling the pressure reservoir in the workshops often leads to a faulty result. This is why a  pump (4) has been created as a special tool, with which filling or testing of the actual pressure can be easily and reliably performed. The  pump (4) has been available since 02/2011

New work instructions have been compiled for the filling and testing procedure, which must be adhered to.

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Damage to the screws during disassembly

Feedback to the workshops has also revealed that when disassembling the pressure reservoir the screws tear off in isolated instances.

For this reason, the screws were changed in 04/2010 The new screws are to be used when mounting the pressure reservoir.

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Change to maintenance interval for pressure reservoir

With immediate effect the maintenance of the pressure reservoir in the pump module (1) must be performed annually.

In future,during maintenance work the valve element (8) and valve cap (9) are to be removed. Pressure reservoirs in their current version will also be populated with the new version of the valve element (8) and valve cap (9), which is then replaced on an annual basis.

The new maintenance interval applies for both the current and the new version of the pressure reservoir.

The maintenance sheet in WIS has been accordingly updated. The maintenance booklets included in the vehicle are to be altered in handwriting by the workshop:

 At "Once annually (J1)" add the "Fill pressure reservoir" item added.

 At "Every 3 years (J3)" delete "Fill pressure reservoir" item.

Pump

001 589 00 71 00

Parts ordering notes