Brakes applied (one circuit out of operation)
| Brakes applied (one circuit out of operation) |
| Possible leak in the primary circuit: |
When the brake pedal is depressed and a leak occurs in the primary circuit, the primary piston is pressed forwards by the push rod until it acts mechanically on the secondary piston. The secondary piston closes the central valve and a hydraulic pressure builds up in the secondary circuit. Braking force is only achieved in secondary circuit.
| Possible leak in the secondary circuit: |
The primary piston closes the return passage and hydraulic pressure builds up in the primary circuit. Braking force only functions in the primary circuit. The secondary piston is pushed forwards and bottoms in the master cylinder. In both events a longer pedal movement is required so that the desired braking effect is obtained. ABS braking effect is then only obtained on the circuit that is still operative and the brake fluid warning light will come on.
In the event of braking without ABS and with one circuit out of operation, the brake system will provide power assistance to the operative system.
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