Checking Pressure Relief Valve In Cap:

WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.

Detach rubber (1) from hand pump.

Attach special tool 17 0 007 / 17 0 008.

Fig 1: Detaching Rubber From Hand Pump

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Screw cap (1) onto special tool.

Fig 2: Screwing Cap Onto Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Build up pressure with special tool (hand pump) 17 0 002; observe pressure gauge to ascertain when opening pressure is achieved.

Compare opening pressure of pressure relief valve.