©
200423
2-13
Inspection and adjustment
BRAKE SYSTEM AND COMPONENTS
ΧΦ65/75/85 series
6
5
2.8 INSPECTING THE RELAY VALVE
Inspecting the relay valve
1.
Connect a pressure gauge to connecting
point (4) of the relay valve.
2.
Connect a pressure gauge to connecting
point (2) of the relay valve.
3.
Pressurise the system.
4.
Depending on the position of the relay valve
in the brake system, slowly activate the
service brake or parking brake.
5.
The pressure in the pressure gauge
connected to connection point (4) must now
increase to approx. 0.8 bar (the increased
parking brake actuating pressure) or 0.5 bar
(service brake), without there being any
noticeable pressure on connection point (2).
From this point, the pressures in both
pressure gauges must increase identically.
The pressure on the gauge connected
to point (2) should not rise in jumps.
Both gauges should indicate a value
corresponding to the graph. See "Technical
data".
R600490
2
1
6
4
A
5
3
7