Pressure leak test

WARNING: This page is about a different variant/trim than selected.

Special tools and equipment

Fig 1: VAG 1310 A Brake Pressure Gauge

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Requirements:

Brake system (hydraulic unit, brake hoses, brake lines and brake calipers) operating properly and free of leaks.

Remove bleed screw at one of the front brake calipers. Connect pressure gauge from VAG 1310A 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 (58.01 psi) during the test period of 45 seconds. Replace master cylinder if pressure drops greatly.