Note: This test requires a pressure gauge capable of measuring liquid pressures up to 50 bar.
1. Apply the handbrake, then lift the front of the vehicle and support it on axle stands.
2. Unscrew the bleed nipple on one of the front brake calipers, connect the pressure gauge to it. If necessary, bleed the pressure gauge.
3. Install the adjustable brake pedal compressor between the driver's seat and the pedal, press the pedal until the pressure gauge shows 50 bar.
4. Within 45 seconds, the pressure difference should not exceed 4 bar. If the difference is greater, first check for leaks in the hydraulic line, master cylinder and calipers. If they are OK, replace the hydraulic modulator.
5. Reduce the brake pedal pressure until the pressure gauge shows 6 bar.
6. Over the next three minutes, the pressure drops should not be more than 1 bar. If the drops are greater, replace the hydraulic modulator.
7. Remove the pressure gauge and install the bleed nipple.
8. Bleed the hydraulic system as described in Chapter 17.
9. Lower the car to the ground.
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