4 wheel drive does not work when pressed on dashboard

1999 Vauxhall Frontera 2.2 petrol
Car: Vauxhall Frontera
Year: 1999
Variant: 2.2 petrol
Categories: Engine & Drivetrain
When the 4wheel drive is set in motion nothing happens apart from the light, flashes. Over time it has taken longer to lock in and no longer locks in at all. Could this be something to do with the air . I cannot find a manual for this make and model anywhere.
Problem added: Nov 10, 2015 (8 years ago)
You could have a quick check on the vac pipes for leaks at nearside wing , near bulkhead .They go to the actuator on the axle .
Answered Nov 10, 2015 (8 years ago)

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