DAF 95XF. Manual — part 134
6
Inspection and adjustment
BRAKE COMPONENTS
1-19
1.12 INSPECTION (SEMI-)TRAILER REACTION VALVE
WABCO design
Explanation of graph
A
Curve of failure in circuit 1
B
Curve of intact circuit 1 and circuit 2, or
failure in circuit 2
C
Area for braking-pressure advance
adjustment.
1.
Ensure there is sufficient system pressure.
2.
Check whether air is escaping via the
exhaust.
3.
Depress the brake pedal, and again check
for leaks.
4.
Disconnect the line at port (42), and plug off
this line.
5.
Depress the brake pedal, and check for
pressure build-up in the service line.
6.
Reconnect the line.
7.
Repeat the last three points, now for port
(41).
8.
Operate the parking brake; pressure should
build up in the service line.
R600122
2
1
42
22
12
43
3
11
41
0
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
P
22
(bar)
P
41/42
(bar)
R 600126
A
B
C
C
P
11/12 =
8 bar
P
41/42 =
10 bar
P
43 =
8 bar
4
ǹ 0006
6
BRAKE COMPONENTS
Inspection and adjustment
1-20
9.
Operate the parking brake to the stop, and
lock the lever; the service line should once
again become pressureless.
10. Simulate a leak in the service line, and
depress the brake pedal: within two
seconds, the outflow of air from the leak
should slow down considerably.
0
1
2
3
4
5
6
7
1
2
3
4
5
6
7
P
22
(bar)
P
43
(bar)
R 600127
P
11/12 =
8 bar
4
ǹ 0006
6
Inspection and adjustment
BRAKE COMPONENTS
1-21
KNORR design
Explanation of graph
B.
Curve of intact circuit 1 and circuit 2, or
failure in circuit 2
C.
Area for braking-pressure advance
adjustment.
1.
Ensure there is sufficient system pressure.
2.
Check whether air is escaping via the
exhaust.
3.
Depress the brake pedal, and again check
for leaks.
4.
Disconnect the line at port (42), and plug off
this line.
5.
Depress the brake pedal, and check for
pressure build-up in the service line.
6.
Reconnect the line.
7.
Repeat the last three points, now for port
(41).
8.
Operate the parking brake; pressure should
build up in the service line.
0
1
2
3
4
5
6
7
8
9
1
P41/42(bar)
P22(bar)
R600333
2
3
4
5
6
8,6
7
8
9
10
B
C
<0,35
C
2,2
0,2
0
+
P11/12 = 8bar
P43 = 8bar
R600340
4
ǹ 0006
6
BRAKE COMPONENTS
Inspection and adjustment
1-22
9.
Operate the parking brake to the stop, and
lock the lever; the service line should once
again become pressureless.
10. Simulate a leak in the service line, and
depress the brake pedal: within two
seconds, the outflow of air from the leak
should slow down considerably.
0
1
2
3
4
5
6
7
8
9
1
P43(bar)
P22(bar)
R600332
2
3
4
5
6
6,3
7
8
9
P11/12 = 8bar
7,3
4
ǹ 0006
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