6
Description of components
DESCRIPTION OF BRAKE COMPONENTS
1-33
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 (5)
upwards, and as a result valve (8) is closed.
There is now a state of balance between the
input pressure at port (41) and output pressure
at port (22).
Changing
When adjusting bolt (6) is turned clockwise for
example, spring retainer (4) will moved
downwards, thus compressing the spring
further. As a result, at a constant operating
pressure at ports (41) and (42), a higher
adjusting pressure under piston (5) will be
required. This adjusting pressure is also located
at the yellow coupling head
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”.
R600340
3
ǹ 0006