Maine CDL — Air Brakes Practice Test 3

1.A Maine permit holder arrives for a skills test in an air-braked truck to clear the air brake restriction. The driver who came along does not hold the proper license and endorsements. What does the Maine manual say happens?

The test goes ahead, but the result is held for 30 daysThe test will be refusedThe examiner takes the place of the accompanying driverOnly the vehicle inspection part of the test is given

2.Why does the manual tell drivers to consult the specific manufacturer's service manual before troubleshooting a brake adjustment problem on automatic slack adjusters?

Federal law forbids touching an adjuster without the manual in handEvery automatic adjuster needs a new part each time it is checkedThe service manual lists the only legal brands of adjusterDifferent manufacturers make them, and they do not all work the same way

3.On Maine's inspection test, you check the air and electric line connections on a combination vehicle. What must you do to receive credit for that item?

Check the connections at the power unit and at the trailerCheck the connections at the power unit onlyDisconnect each line and reconnect it for the examinerStart the engine and build pressure to governor cut-out first

4.Three of these statements about the dual parking control valves found on some buses match the manual. Which one does NOT?

One valve is a push-pull type used to set the spring brakes for parkingThe second valve is held in the 'out' position by a springPushing the second valve in sends air from the separate tank to release the spring brakesThe separate tank holds enough air to release the spring brakes as often as you need

5.The Air Brakes section adds extra checks to three steps of the seven-step inspection. Which of these steps gets NO added air brake check there?

Step 2, the engine compartment checksStep 5, the walk-around inspectionStep 6, checking the signal lightsStep 7, the final brake check

6.A major leak has pulled your straight truck's air pressure down to 40 psi, and it is still falling. What should you expect from the spring brakes at this point?

They could be coming on, since they apply fully somewhere between 20 and 45 psiNothing, because spring brakes stay off until the tanks are completely emptyNothing, because spring brakes apply only when the driver pulls the knobThey will release, since low pressure lets the springs relax

7.A Maine CDL holder has an air brake restriction and has just been hired by a company that runs air-braked trucks. When does the Maine manual say a license can be amended to remove a restriction?

Only at the next renewalAt any timeOnly within 30 days of the license being issuedOnly after one year with no violations

8.You brake hard on a slippery road in a vehicle without ABS. Which pairing of locked wheels and result matches the manual?

Steering wheels lock: the vehicle may jackknife. Other wheels lock: you lose steering controlSteering wheels lock: the stop gets shorter. Other wheels lock: nothing changesEither set locks: the spring brakes applySteering wheels lock: you lose steering control. Other wheels lock: you may skid, jackknife or spin

9.Which order matches the manual's steps for a normal stop in an air-braked truck with a manual transmission?

Push in the clutch first; coast down; then press the brake pedal just before stoppingPick a starting gear; push in the clutch; then press the brake pedal hardSet the parking brake; press the brake pedal; then shift to neutralPress the brake pedal and control the pressure for a smooth stop; push in the clutch once engine rpm is near idle; pick a starting gear after stopping

10.Which of these is NOT one of the conditions the manual attaches to its 55-mph total stopping distance figure for an air-braked vehicle?

An empty vehicleAn average driverGood tractionGood brake conditions