6
CF65/75/85 series
Description of components
OPERATION OF BRAKE COMPONENTS
2-39
Brake pressure advance
Pressure build-up
If the foot brake valve is used to build up
pressure at connection points 41 and 42, the
output pressure at connection point 22 will also
move piston 5 upwards, closing valve 8.
There is now a state of balance between the
input pressure at connection point 41 and the
output pressure at connection point 22.
Change
If adjusting screw 6 is turned clockwise, for
example, spring retainer 4 will be moved
downwards, further compressing the spring
underneath it. Therefore, if the operating
pressure at connection points 41 and 42 remain
the same, a higher adjusting pressure will be
needed under piston 5. This adjusting pressure
is also on the yellow coupling head.
This increase of service pressure to the trailer
vehicle in relation to the brake pressure from the
truck is called brake pressure advance.
For the setting procedure, see “Inspection and
adjustment”.
R600340
4
ᓻ 200324