9-5 Arc Sport Wagon (9600) V6-3.0L Turbo (B308) (2002)
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In the rest (brakes not applied) position, the return springs (6) press the pistons (1, 4) towards the rear end position. In this position, both return
passages are open (via the central valves (3)) and the brake system is without pressure. A retaining ring (9) prevents rearward movement of the
primary piston and a stop pin (7) prevents rearward movement of the secondary piston. A stop pin (8) opens the primary piston's central valve when
the piston is in the rest (brakes off) position. The secondary piston's central valve is opened in the rest (brakes off) position by the stop pin (7), which
also limits rearward movement of the piston.
The master cylinder and other hydraulic components are filled with brake fluid under zero pressure.
Volume equalization in the system is now possible in the event of a change in the temperature of the brake fluid or heavy brake pad wear.
Braking, both circuits in operation
