Discovery II
BRAKES
DESCRIPTION AND OPERATION
70-7
Section through brake servo assembly - brakes off
1 Non return valve
2 Housing
3 Diaphragms
4 Minor diaphragm
5 Tie bolt
6 Valve body
7 Valve
8 Valve spring
9 Input rod spring
10 Input push rod
11 Filter
12 Gaiter
13 Piston
14 Ratio disc
15 Reaction disc
16 Central plate
17 Master cylinder
18 Return spring
19 Guide tube
20 Output push rod
21 Bush
22 Air pressures
a Partial vacuum
b Ambient