Brakes - Hydraulics; Pressurised Leak Test; High-Pressure And Low-Pressure Tests - Audi A8 2003 Workshop Manual

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Brakes - hydraulics

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Pressurised leak test

1.1 Pressurised leak test
Special tools and workshop equipment required
♦ Tester for brake pressure regulator - V.A.G 1310/A-
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♦ -V.A.G 1310–-
1.2

High-pressure and low-pressure tests

Before starting:
Make sure that the brake system (master cylinder, brake hoses,
brake lines and brake calipers) works properly and is free of leaks.
High-pressure test:
– Remove bleeder screw at one of the front brake calipers. Con‐
nect pressure gauge -V.A.G 1310-- or tester for brake pres‐
sure regulator - V.A.G 1310/A- and bleed.
– Insert brake pedal depressor between brake pedal and driver's
seat. Apply pressure to brake pedal until the gauge indicates
a pressure of 50 bar. The pressure must not drop by more than
4 bar during the test period of 45 seconds. Renew hydraulic
unit if drop in pressure exceeds the above figure.
Low-pressure test:
– Move the brake pedal depressor back until the pressure gauge
indicates a pressure of 6 bar.
– The pressure should not drop by more than 1 bar within the
test period of 3 minutes.
Renew hydraulic unit if drop in pressure exceeds the above figure.
Audi A8 2003 ➤
Brake system - Edition 03.2013
1. Pressurised leak test
83