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TRUCK DRIVER
Missing Question
| Question | Answer |
|---|---|
| During a pre-trip inspection, all belts should be checked. Which item in the engine compartment may be belt driven? | alternator, water pump, air compressor |
| What item would you check on the front of your vehicle? | Condition of front axle.Condition of steering system. Condition of windshield. |
| The perception time for an alert driver is about | 3/4 second. At 55 mph, you travel 60 feet in 3/4 second |
| .........is the distance traveled from the time your brain tells your foot to move from the accelerator until your foot is actually pushing the brake pedal. | Reaction distance |
| The average driver has a reaction time of | 3/4 second. This accounts for an additional 60 feet traveled at 55 mph. |
| ........is the distance it takes to stop once the brakes are applied | Braking distance |
| At 55 mph on dry pavement with good brakes, it can take a heavy vehicle about | 170 feet and about 4 1/2 seconds to stop. |
| At 55 mph it will take about 6 seconds to stop and your vehicle will travel the distance of a football field (60 + 60 + 170 = 290 feet). | stopping distance Total stopping distance |
| How will wet roads affect your stopping distance? | Wet roads can double stopping distance |
| With low-beam headlights, approximately how far ahead can you see? | 250ft |
| Avoid braking - If possible, avoid using the brakes until your speed has dropped to about | 20 mph. Then brake very gently to avoid skidding on a loose surface. |
| The top 2 causes of brake failure for hydraulic brakes is | loss of pressure and brake fade. |
| When a front-wheel skid occurs, the only way to stop the skid is | Stop turning and/or braking so hard. Slow down as quickly as possible without skidding. |
| What is a reason Drive-Wheel Skids occur? | The rear drive wheels lock up |
| The B:C type fire extinguisher is designed to work on | electrical fires and burning liquids |
| The A:B:C type is designed to work on burning | wood, paper and cloth as well. |
| - Coupling devices are rated for the maximum weight they can pull and/or carry. | Coupling device capacity |
| also is used to prevent movement of cargo | Bracing |
| Cargo should have at least one tiedown for each | 10 feet of cargo |
| No matter how small the cargo is, it should have at least | two tiedowns holding it |
| The.......system applies and releases the brakes when you use the brake pedal during normal driving | service brake |
| The...... system applies and releases The when you use the parking brake control. | parking brakes |
| The........ system uses parts of the service and parking brake systems to stop the vehicle in the event of a brake system failure | emergency brake |
| The....pumps air into the air storage tanks (reservoirs) is connected to the engine through gears or a V-belt. may be air cooled or may be cooled by the engine cooling system. It may have its own oil supply or be lubricated by engine oil. | air compressor |
| .......are used to hold compressed air. The number and size of air tanks vary among vehicles. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. | Air storage tanks |
| Compressed air usually has some water and compressor oil in it, which is bad for the air brake system. For example, the water can freeze in cold weather and cause brake failure. The water and oil tend to collect in the bottom of the air tank. Be sure to | Drain the air tanks completely. Each air tank is equipped with a drain valve in the bottom. |
| .......operated by turning a quarter turn or by pulling a cable. You must drain the tanks yourself at the end of each day of driving. | Manually Air Tank Drains |
| in which the water and oil are automatically expelled. They may be equipped for manual draining as well. | Automatic Air Tank Drains The automatic types are available with electric heating devices. These help prevent freeze-up of the automatic drain in cold weather |
| A safety relief valve is installed in the first tank the air compressor pumps air to. The safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at | 150 psi. If the safety valve releases air, something is wrong. Have the fault repaired by a mechanic |
| Foundation brakes are used at each wheel. The most common type is the | S-cam drum brake |
| are located on each end of the vehicleʼs axles. The wheels are bolted to the drums. The braking mechanism is inside the drum. To stop, the brake shoes and linings are pushed against the inside of the drum. | Brake drums, shoes, linings: |
| When you push the brake pedal, air is let into each brake chamber. Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake cam shaft. | S-cam brakes |
| The.........the brake chamber push rod pushes a wedge directly between the ends of two brake shoes. This shoves them apart and against the inside of the brake drum | Wedge brakes |
| In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like S-cam brakes. But instead of the S-cam, a “power screw” is used | Disc brakes |
| These gauges tell you how much pressure is in the air tanks. | Supply Pressure Gauges |
| This gauge shows how much air pressure you are applying to the brakes (this gauge is not on all vehicles) | Application Pressure Gauge |
| A warning signal you can see must come on before the air pressure in the tanks falls below 60 psi (or one-half the compressor governor cutout pressure on older vehicles). The warning is usually a red light. A buzzer also may come on | Low Air-Pressure Gauge |
| Powerful springs are held back by air pressure and if the air pressure is removed, the springs put on the brakes | Spring Brakes (emergency brake) |
| A control handle on the dash board may be used to apply the spring brakes gradually | Modulating Control Valve |
| Park on level ground and chock the wheels. Turn off the parking brake. Use gloves and pull on each slack adjuster by hand. Slack adjusters should not move more than about 1-inch. | Check manual slack adjusters on S-Cam brakes: |
| Brake drums or discs must not have cracks longer than one-half the width of the friction area. Linings (friction material) must not be loose or soaked with oil or grease. They must not be dangerously thin. Mechanical parts must be in place, not broken or | Check brake drums or discs, linings and hoses: |
| What are slack adjusters? | An adjustable member that transmits brake application force and permits compensation for lining wear |
| are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The couplers have a rubber seal that prevents air from escaping. | Glad hands |
| The trailer air brakes are supplied with air using the | emergency line (also called the supply line). |
| An.......helps reduce the risk of ice in air brake valves and other parts during cold weather | Alcohol Evaporator |
| The driver's foot remains on the brake pedal in which the anti-lock module then acts as a foot pumping the air brake system | Anti-Lock Brakes |
| While stopped, pull out the trailer air supply control and pull gently on the trailer with the tractor | correct way to test the trailer emergency brakes |
| If the air compressor begins to leak what keeps air in the tanks? | The One-Way Check Valve |
| ........is a technique for changing gears commonly practiced by drivers of semi-trailer trucks. It is meant to reduce fuel consumption — something very important for drivers who travel several hundred miles each day. | Progressive shifting |
| The braking power of the spring brakes: | Depends on the adjustment of the service brakes |
| The brake pedal in an air brake system: | Controls the air pressure applied to put on the brakes |
| What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus? | Spring Pressure |
| To test air leakage rate you should: | Turn off the engine and release the service brake |
| Where will you find the drain valve for each air tank? | In the botton of the tank |
| What is counter steering? | Turning the wheel in the opposite direction after steering to avoid a traffic emergency |
| vehicles hauling pipes, poles, machinery or other structural objects that cannot be quickly taken apart. In most states, the length of these objects may not exceed 80 feet, These vehicles are not allowed to operate when it is | dark or on Saturdays, Sundays and legal holidays. |
| Turn signals must be visible from how many feet away? | 300 Feet |
| Knowing When to Shift Up | engine speed and road speed. You can use the tachometer to determine your engine speed (RPM's) or the speedometer to determine your road speed (mph)up. |
| During a drive-wheel braking skid, you should: | Stop braking,Turn quickly When a vehicle begins to slide sideways. Countersteer As a vehicle turns back on course, it has a tendency to keep right on turning. |
| Before disconnecting from a trailer, you should: | Apply the trailer spring brakes, then back up gently towards the trailer to ease tension off the fifth wheel locking lever |
| With the engine off, step on and off the brake pedal several times until the trailer air supply control pops out | Tractor Protection Valve Test |
| While stopped, pull out the trailer air supply control and pull gently on the trailer with the tractor | Trailer emergency brakes test |
| Check for normal air pressure, release the parking brakes, move the vehicle forward slowly, and apply trailer brakes with the hand control (trolley valve), if so equipped | Trailer Service Brakes Test |
Created by:
fofo1986