A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
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Vacuum Brake Booster Check Valve: Service and Repair
Check Valve
Removing
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Remove vacuum hose on left and right of the check valve - 4 -.
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Remove check valve from vehicle.
Installing
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Installation is in reverse sequence. Observe the following when doing so:
Valve must allow air to flow in direction of arrow.
The arrow indicates the direction of the vacuum pump.