Hydraulic System: Testing and Inspection

Pressure leak test
Special tools and equipment required





^ VAG 1310 A Brake pressure gauge

Requirements
^ Brake system (hydraulic unit, brake hoses, brake lines and brake calipers) must function properly and not leak.
^ Remove bleeder valve at one front brake caliper. Connect pressure gauge from VAG 1310 and bleed.
^ Apply pressure to brake pedal until the gauge indicates a pressure of 50 bar (725 psi). The pressure must not drop by more than 4 bar during the test period of 45 seconds. Renew master cylinder if pressure drops greatly.
- Pressure must not drop by more than 4 bar (58 psi) during the test period (45 seconds).
^ If pressure drops more than specified, replace master cylinder.