Checking freedom of movement of valve ball in piston "B"

WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Freedom Of Movement Of Valve Ball In Piston "B"

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Lightly coat bore for valve ball - arrow - at front side with oil.

CAUTION: Wear eye protection.

Charge valve ball from rear with compressed air.

Only little ball stroke (hardly visible).
Ball is not spring-loaded (moves back slowly).

If valve ball is stuck:

Loosen ball with a nail or tip of a ball point pen.

If valve ball is still stuck or leaks:

Replace piston "B".

NOTE:

A valve ball that does not seal properly or is stuck will cause slipping in reverse gear.