Checking vacuum hoses with non-return valves to valve N125 and N126 — AUDI

🧭 Before you start

Fits: VW Transporter T6 (7F), VW Transporter T6 (7E)

• Renewed: leaking parts

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• The illustration shows the valve mounting with valves from above.

🔧 Engine codes this applies to

📋 Procedure

1. Remove front left underbody cover General body repairs, exterior66Underbody cover; Removing and installing underbody covers. [Note: The illustration shows the valve mounting with valves from above.]
2. Pull vacuum hose (1) to differential lock valve 2N126 off connecting piece (arrow).
3. Pull vacuum hose (2) to differential lock valve 1N125 off connecting piece (arrow).
4. Connect hand vacuum pumpVAS 6213 to pulled-off vacuum hoses one after the other and then generate a partial vacuum of 0.6 bar.
5. Observe pressure gauge of hand vacuum pumpVAS 6213 for approx. 30 seconds.

6. First pull vacuum hose off at hand vacuum pumpVAS 6213.
7. If the non-return valve functions properly, a clear hiss is audible when vacuum in vacuum hose is released.
8. Reconnect vacuum hoses to T-piece.
9. Connect hand vacuum pumpVAS 6213 to differential lock valve 1N125 or to differential lock valve 2N126 and generate a partial vacuum of 0.6 bar.
10. Observe pressure gauge of hand vacuum pumpVAS 6213 for approx. 30 seconds.
11. Renew leaking parts.
12. Check following vacuum hoses:

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