Leak test under pressure Page 1 of 1 47-1 Leak test under pressure Special tools and equipment VAG1310 or VAG1310A brake pressure gauge Requirement Brake system (hydraulic unit, brake hoses, brake lines and brake calipers) operating properly and free of leaks Testing - Remove bleeder screw at one front brake caliper. Connect pressure gauge VAG1310 or VAG1310A and bleed. - Insert brake pedal depressor between brake pedal and driver's seat. Apply pressure to brake pedal until gauge indicates pressure of 50 bar (725 psi). The pressure must drop by not more than 4 bar (58 psi) during the test period of 45 seconds If the pressure drop is greater: - Replace brake master cylinder. http://127.0.0.1:8080/audi/servlet/Display?action=Goto&type=repair&id=AUDI.B5.SU03.47.1 11/20/2002