Checking wheel cylinder for leaks

Using modified wedge VAG 1474/5, carefully lift dust seal.
If brake fluid is found in the dust seal:
Replace wheel cylinder.

Fig 1: Checking Wheel Cylinder For Leaks

Courtesy of VOLKSWAGEN OF AMERICA, INC.

CAUTION: Use care to ensure that the dust seal is not damaged. Use only a blunt instrument (e.g. plastic wedge).