2005 Commercial Driver’s License Manual Figure 5.4 .
Subsection 5.1 Test Your Knowledge 1. Why must air tanks be drained
2. What is a supply
pressure gauge used for 3. All vehicles with air brakes must have a low air pressure warning signal. True or False
4.
What are spring brakes 5. Front wheel brakes are good under all conditions. True or False
6. How do you know if your vehicle is equipped with antilock brakes These questions maybe on your test. If you can’t
answer them all, reread subsection 5.1.
5.2 – Dual Air Brake Most heavy-duty vehicles use dual air brake systems for safety. A dual air brake system has
two separate air brake systems, which use a single set of brake controls. Each system has its own air tanks, hoses, lines, etc. One system typically operates the regular brakes on the rear axle or axles. The other
system operates the regular brakes on the front axle (and possibly one rear axle. Both systems supply air to the trailer (if there is one. The first system is called the "primary" system. The other is called the "secondary" system. See Figure 5.4. Before driving a vehicle with a dual air system, allow time for the air compressor to buildup a minimum of 100 psi pressure in both the primary and secondary systems. Watch the primary and secondary air pressure gauges (or needles, if the system has two needles in one gauge. Pay attention to the low air pressure warning light and buzzer. The warning light and buzzer should shutoff when air pressure in both systems rises to a value set by the manufacturer. This value must be greater than 60 psi. The warning light and buzzer should come on before the air pressure drops below 60 psi in either system.
If this happens while driving, you should stop right away and safely park the vehicle. If one air system is very low on pressure, either the front or the rear brakes will not be operating fully. This means it will take you longer to stop. Bring
the vehicle to a safe stop, and have the air brakes system fixed.
Table of contentsWho needs a commercial driver license?Commercial learner permit (clp)Farm-related service industry (frsi) waiverCodetpnhxscodeGeneral requirementsCommercial driver license (cdl)Safety inspectionTexas drivers applying foraOthers applying fora commercial driver licenseDisqualificationsAre the tests difficult?Section 1 introductionFigure 1.1 note:School bust testWhat sections should you study?Interstate non-exceptedIntrastate non-exceptedSection 1 - introductionThe irp registrant and the ifta licensee mayFigure 1 – individual vehicle mileage & fuel record (example)Vehicle inspection.Section 2 – driving safelyFigure 2.1suspension system defects.Exhaust system defects.Approaching the vehicle.Step 2: check engine compartmentPage 2-3 version: july 2013Look at the gaugesCheck condition of controls.Left front sideStep 6: check signal lightsStep 7: start the engine and checkTest service brake stopping actionSafety inspection.Back slowly.Knowing when to shift up.Basic procedures for shifting downBefore starting down a hill.Subsections 2.2 and 2.3Importance of looking far enough ahead.Look for traffic.Mirror adjustment.Check your vehicle.Lane changes.Stopping on the roadDon't direct traffic.When it's hard to see.Reaction distanceThe effect of vehicle weight on stoppingJust after rain beginsFigure 2.12 2.7.2 – space behindPage 2-16 version: july 2013Staying centered in a lane.Strong winds.Seeing hazards lets you be prepared.Learning to see hazards.Work zones.Foreign objects.Off ramps/on ramps.Delivery trucks can present a hazard.Pedestrians and bicyclists can also beSlow drivers.Drivers in a hurry.Driver body movement as a clue.Subsections 2.7 and 2.8Subsections 2.9 and 2.10Fatigue and lack of alertness.Warning signs of fatigueMaintaining alertness while drivingPoor lighting.Drunk drivers.Other lights.Avoid blinding others.Use high beams when you can.Wipers and washers.Lights and reflectors.Radiator shutters and winterfront.Slippery surfaces.Adjust space to conditions.Engine oil.Engine belts.Go slowly enough to prevent overheating.Passive crossings.Advance warning signs.Cross-buck signs.Don't rely on signals.Subsections 2.15 and 2.16Keep both hands on the steering wheel.Where to steer.Leaving the road.Returning to the road.Controlled braking.Find an escape route.Respond to tire failure.Check the tires.Abs won’t allow you to drive fasterAbs won’t change the way you normallyOver-steering.Figure 2.19Follow safe procedures.Pull off the road.Extinguish the fire.Class/type of firesFigure 2.21 section 2 – driving safelyHow alcohol works.What determinesHow alcohol affects driving.What is a drinkEffects of increasingTo communicate the risk.Figure 2.24 2.23.3 – lists of regulated productsSubsections 2.22 and 2.23Figure 3.2 section 3 - transporting cargo safelySection 3 test your knowledgeSection 3 - transporting cargo safelyFigure 4.1 4.2.2 – forbidden hazardous materialsSection 4 - transporting passengers safelyThe most common bus accidents.Stop at drawbridges.Section 4 test your knowledgeFigure 5.1 section 5 – air brakesS-cam brakes.Figure 5.2 wedge brakes.Modulating control valves.Figure 5.3 5.1.16 – antilock braking systems (abs)Section 5 – air brakesCheck brake drums Test low pressure warning signal.Check rate of air pressure buildup.Test air leakage rate.Check air compressor governor cut-in andTest parking brake.Section 6 - combination vehiclesFigure 6.3 figure 6.4Subsection 6.1Emergency air-line.Figure 6.6 section 6 - combination vehiclesSubsection 6.2Figure 6.7 6.3.2 – braking with absStep 5. secure tractorStep 8. supply air to trailerStep 9. lock trailer brakesStep 12. secure vehicleStep 14. connect the electrical cord and checkStep 16. remove trailer wheel chocksStep 3. chock trailer wheelsStep 5. disconnect airlines and electricalTest tractor protection valve.Test trailer emergency brakes.Subsection 6.5Section 7 - doubles and triplesConnect converter dolly to front trailerUncouple rear trailerUncouple triple-trailer rigCoupling system areasDouble and triple trailersSection 7 test your knowledgeFigure 8.1 8.2.1 – high center of gravitySection 8 - tank vehiclesSection 9 - hazardous materialTransportation—who does whatHazardous materials classExamples of hazmat placardsThe hazardous materials table.Appendix b to 49 cfr 172.101 – list of marineSpecial instructions:Placard table 2Figure 9.8 section 9 - hazardous materialSubsections 9.1, 9.2, and 9.3No smoking.Use closed cargo space.Class 4 (flammable solids) and class 5Class 8 (corrosive) materials.Class 2 (compressed gases) includingClass 7 (radioactive) materials.Do not load tableFigure 9.9 mixed loads.Subsection 9.5Emergencies 9.7.1 – emergency response guidebookPage 9-15 version: july 2013Class 1 (explosives).Class 7 (radioactive materials).National response centerFigure 9.10 classes of hazardous materialsFigure 9.11 subsections 9.6 and 9.7Radioactive separationDivision – a subdivision of a hazard class. epaGross weight or gross massHazardous substanceLimited quantityOutage or ullageProper shipping nameSection 10 – school busesAdditional procedures for students that mustDropped or forgotten objects.Handrail hang-ups.Determine need to evacuate bus.Mandatory evacuations.Active crossings.Figure 10.5Figure 10.7 flashing red light signals.Approaching the crossingCrossing the trackPolice officer at the crossing.Containment or storage areas.Power steering fluidOil pressure gaugeAmmeter/voltmeterLights/reflectors/reflector tape conditionHorn check that air horn and/or electric horn work. heater/defrosterSection 11 - vehicle inspectionSteering box/hosesShock absorbersHub oil seals/axle sealsDoor(s)/mirror(s)Splash guardsCatwalk/stepsHitch release leverLocking pins (fifth wheel)Tongue storage areaLights/reflectorsLanding gearEmergency exitsLevel/air leaksRemainder of vehicleOutside vehicle observations (looks)Final positionFigure 12.2: offset back/rightSection 13 – on-road drivingSpecial permits.Two way roadwayLighting and reflectors.Divided highwayImplements of husbandry.Dard vehicle size requirementsSchool buses, recreational vehicles, and othersTest your knowledgeTexas commercial driver licenseEmail (pdf format only):Share with your friends: