| They have little braking power | |
| Usually require a fifth wheel converter | |
| All of these are true | |
| Often do not have spring brakes |
| The minimum air pressure for the air storage tanks | |
| The level at which the air compressor will start pumping air into the air storage tanks | |
| The average air pressure maintained in the air storage tanks | |
| The level at which the air compressor will stop pumping air into the air storage tanks |
| Electrical fires and burning liquids only | |
| Gasoline and oil fires only | |
| All fires | |
| Wood, paper and cloth fires only |