4000CS Quattro L5-2144cc 2.14L SOHC (JT) (1986)
Brake Proportioning/Combination Valve: Testing and Inspection
Brake Pressure Regulator
1. Raise vehicle on lift.
2. Remove bleeder screws and connect adapters to left front and left rear brake calipers.
3. Connect VAG1310 or similar pressure gauge and bleed both hoses and gauges with bleeder valves on gauges.
4. Unhook parking brake cable on rear brake caliper.
5. Depress brake pedal until gauge on front axle reads 50 bar (725 psi).
^
Gauge for rear axle must read 35-39 bar (508-566 psi).
6. Increase brake pedal pressure until gauge on front axle reads 100 bar (1450 psi).
^
Gauge for rear axle must read 58-62 bar (841-899 psi).
7. If pressure cannot be maintained, replace regulator.
8. Remove pressure gauges.
9. Bleed brakes before driving.