6
Description of components
DESCRIPTION OF BRAKE COMPONENTS
1-29
Advance
Pressure build-up
When the foot valve is operated, pressure will
be built up at ports (41) and (42), the output
pressure at port (22) will also force piston (6)
downwards via bore (5a), and as a result inlet
(7) is opened.
Via bore (5b), braking pressure enters the
circular channel beneath pistons (4) and (5).
Zuigers (4) en (5) worden teruggedrukt, totdat er
een evenwichtssituatie is ontstaan, waardoor
inlaatventiel (3) wordt afgesloten.
Changing
If adjusting screw (9) is turned
counter-clockwise, some pressure will escape
from the circular channel beneath pistons (4)
and (5).
As a result of this reduced pressure, the output
pressure (port 22) must become higher, in order
to maintain the state of balance.
This service-pressure increase to the
(semi-)trailer as compared to the braking
pressure from the tractor is called
braking-pressure advance.
For the setting procedure, refer to the chapter
“Inspection and adjustment”.
R600123
3
9
5b
5a
2
4
5
6
7
42
22
12
43
11
41
3
ǹ 0006