Glossary “trailer hand-control valve” Definition:
A device located on the dash or steering column used to apply only the trailer brakes; primarily used in jack-knife situations.
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trailer hitching
Glossary “trailer hitching” Definition:
Sudden lurch occurs due to power flow interruption during deceleration.
tractor breakaway valve
Glossary “tractor breakaway valve” Definition:
Device that automatically seals off the tractor air supply from the trailer air supply when the tractor system pressure drops to 30 or 40 psi.
tractor protection valve
Glossary “tractor protection valve” Definition:
Term used for tractor breakaway valve.
trade number
Glossary “trade number” Definition:
The number stamped on an automotive light bulb. All bulbs of the same trade number have the same candlepower and wattage, regardless of the manufacturer of the bulb.
trail braking
Glossary “trail braking” Definition:
Driving technique where the brakes are applied after entering a turn to help rotate the vehicle.
tractor
Glossary “tractor” Definition:
1). Term used for truck tractor. 2). Motor vehicle having a fifth wheel used for pulling a semitrailer. 3). Truck or short wheel-base vehicle used for pulling a trailer or semitrailer. 4). A self-propelled vehicle having tracks or wheels.
tractive effort
Glossary “tractive effort” Definition:
Pushing force exerted by the vehicle’s driving wheels against the road’s surface.
Traction-Lock
Glossary “Traction-Lock” Definition:
Limited-slip differential by Ford.
traction rating
Glossary “traction rating” Definition:
Tire rating that indicates the traction capabilities of the tire to the consumer.
tracking
Glossary “tracking” Definition:
Rear wheels following directly behind the front wheels.
traction
Glossary “traction” Definition:
A body’s friction on a surface such as a vehicle tire on a roadway.
traction bar
Glossary “traction bar” Definition:
Device used on a rear-wheel-drive to prevent axle twist and spring wind up during hard acceleration.
Traction Control System
Glossary “Traction Control System” Definition:
A system that attempts to control wheel spin during acceleration on slick road surfaces.
trace
Glossary “trace” Definition:
1). A colored dye introduced into a system to detect leaks. 2). To follow logically from beginning to end. 3). A bar hinged to two parts to transfer motion between them. 4). A graphical representation of the change in voltage on the line over a specific period of time. 5). Grapic display of emission gases emitted from a vehicle during emission testing.
track
Glossary “track” Definition:
1). A term used for tread. 2). Pathway a vehicle travels during operation. 3). To follow. 4). A belt or tread that guides lines of motion. 5). The side-to-side distance between an axle’s tires.
track bar
Glossary “track bar” Definition:
A steel bar attached to the axle housing on one side and he frame on the other side of the vehicle to maintain sideways alignment between the axle housing and frame on some coil-spring equipped models.
track control bar
Glossary “track control bar” Definition:
A suspension part that limits the body lateral movement. Also called antisway bar, or track bar.
TR
Glossary “TR” Definition:
Thermal Reactor, or Transformer Rectifier, or Transmission Range
TPREL
Glossary “TPREL” Definition:
Lowest Steady TP Voltage Since Engine Start (RATCH)