Hydraulic Modulator - Hydraulic Pressure Test
- Remove one front wheel. Remove bleed screw from brake caliper. Connect and bleed Pressure Gauge Set (VW 1310). Press brake pedal until pressure gauge reads 725 psi (51 kg/cm2 ). If pressure drops more than 58 psi (4 kg/cm2 ) in 45 seconds, replace hydraulic modulator. If okay, go to next step.
- Press brake pedal until pressure gauge reads 87 psi (6 kg/cm2 ). If pressure drops more than 14.5 psi (1 kg/cm2 ) in 3 minutes, replace hydraulic modulator.
NOTE:
If the anti-lock indicator light comes on while driving and goes out again by itself after a short time, check voltage supply to ABS control unit at terminal No. 1.