30 CFR § 56.14101
Brakes.
(a) Minimum requirements. (1) Self-propelled mobile equipment
shall be equipped with a service brake system capable of stopping and holding
the equipment with its typical load on the maximum grade it travels. This
standard does not apply to equipment which is not originally equipped with
brakes unless the manner in which the equipment is being operated requires
the use of brakes for safe operation. This standard does not apply to rail
equipment.
(2) If equipped on self-propelled mobile equipment,
parking brakes shall be capable of holding the equipment with its typical
load on the maximum grade it travels.
(3) All braking systems installed on the equipment shall
be maintained in functional condition.
For more information: See MSHA'S Program Policy Manual
(b) Testing. (1) Service brake tests shall be conducted when
an MSHA inspector has reasonable cause to believe that the service brake
system does not function as required, unless the mine operator removes the
equipment from service for the appropriate repair;
(2) The performance of the service brakes shall be
evaluated according to Table M-1.
Table M-1
+---------------------------+------------------------------------------------------------+
| | Equipment speed, MPH |
| Gross vehicle weight lbs. |-----|-----|-----|-----|-----|------|------|------|------|------|------|
| | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
+---------------------------+----+----+----+----+----+-----+-----+-----+-----+-----+-----+
| Service Brake Maximum Stopping Distance--Feet |
+---------------------------+----+----+----+----+----+-----+-----+-----+-----+-----+-----+
| 0-36000...................| 34 | 38 | 43 | 48 | 53 | 59 | 64 | 70 | 76 | 83 | 89 |
| 36000-70000...............| 41 | 46 | 52 | 58 | 62 | 70 | 76 | 83 | 90 | 97 | 104 |
| 70000-140000..............| 48 | 54 | 61 | 67 | 74 | 81 | 88 | 95 | 103 | 111 | 119 |
| 140000-250000.............| 56 | 62 | 69 | 77 | 84 | 92 | 100 | 108 | 116 | 125 | 133 |
| 250000-400000.............| 59 | 66 | 74 | 81 | 89 | 97 | 105 | 114 | 123 | 132 | 141 |
| Over 400000...............| 63 | 71 | 78 | 86 | 94 | 103 | 111 | 120 | 129 | 139 | 148 |
+---------------------------+----+----+----+----+----+-----+-----+-----+-----+-----+-----+
Stopping distances are computed using a constant decleration of 9.66 FPS(super)2 and
system response response times of .5.1, 1.5, 2, 2.25 and 2.5 seconds for each
increasing weight category respectively. Stopping distance values include a
one-second operator response time.