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Vacuum servo unit vacuum hose and non-return valve - removal, testing and refitting
Braking system / Vacuum servo unit vacuum hose and non-return valve - removal, testing and refitting


Removal
1 Depress the brake pedal four or five times, to dissipate any remaining vacuum from the servo unit.

2 Disconnect the vacuum hose adaptor at the servo unit, by pulling it free from the rubber grommet (see illustration). If it is reluctant to move, prise it free, using a screwdriver with its blade inserted under the flange.

17.2 Removing the plastic adaptor from the servo unit
17.2 Removing the plastic adaptor from the servo unit

3 Detach the vacuum hose from the inlet manifold connection, pressing in the collar to disengage the tabs, then withdrawing the collar slowly.

4 If the hose or the fixings are damaged or in poor condition, they must be renewed.

Testing
5 Examine the non-return valve for damage and signs of deterioration, and renew it if necessary. The valve may be tested by blowing through its connecting hoses in both directions. It should only be possible to blow from the servo end towards the inlet manifold.

Refitting
6 Refitting is a reversal of the removal procedure. If fitting a new non-return valve, ensure that it is fitted the correct way round.


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