1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156 
gersoll-Rand Co. Ltd.,
Page 89
If you've noticed an error in this article please click here to report it so we can fix it.
5 Queen Victoria Street, London, E.C.4.
An inertia type of engine-output tester, 3duced by I-19 Frichs, Aarhus, Denmark, d marketed in the UK by Ingersollid, can also be used for brake testing.
The Frichs tester has a built-in rotating ass in the form of a flywheel which is celerated by the power unit in the measureant of output torque; when used as a brake ster, the flywheel is decelerated and pedal assure is recorded by a meter attached to a pad. A visual record is made in the form of chart of pedal pressure plotted against eking force which can readily be converted o brake efficiency if the load on the axle is own. A car-type tester is suitable for light mmercial vehicles up to 30cwt capacity; a .ger tester is designed for axle loads up to
I tons.
Any difference of braking force between iposite wheels is shown by a chart as well brake application lag and variations during e revolution of a wheel. It is possible to sess braking-force distribution by comring the charts of braking force of each axle. a test is made of the brakes of a doublelie bogie one of the drive shafts has to be moved.