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Brakes 51
9-5
Brake servo and master cylinder
Master cylinder
1. Pushrod with primary piston
2. Pressure chamber, primary circuit
3. Central valves
4. Secondary piston
5. Pressure chamber, secondary circuit
6. Return spring
7. Stop pin
8. Stop pin
9. Seals
The brake servo and brake fluid reservoir are
new and adapted to the new master cylinders.
The new master cylinders allow a greater flow of
fluid between the ESP hydraulic unit and the
master cylinders. Brake fluid pulses at a much
greater extent than was necessary for TC/ABS.
The master cylinder has been modified by raising
the height of the brake fluid reservoir tower by
35mm (1.37in). This is so that the brake fluid
reservoir will come above the hydraulic unit,
which has been given a new location adjacent to
the bulkhead.
The primary cylinder is identical with the earlier
master cylinders on the 9-5.
The secondary cylinder is a plunger-type deep
cylinder without central valve, but with seals. Half
the function is now integrated in the brake servo.