CDL Fill-in — Page 80 (Air Brakes)

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CDL Fill-in — Page 80 (Air Brakes)

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13453255100450216adjustmentbrakescontrolleddowngradeenginefadefivefourfrictiongearhalfheatlaglininglocklockingone-halfperceptionpressurereactionreleaserollingslowdownsmallstabsteeringsupplementthreetwowheels

You should brake in a way that keeps your vehicle in a straight line and lets you turn if it becomes necessary. You can use the “ braking” method or the “ braking” method.

Controlled Braking. Apply the brakes as hard as you can without the wheels. Keep steering wheel movements very . If you need a larger steering adjustment or if the wheels lock, the brakes, then re-apply as soon as you can.

Stab Braking. Apply your brakes all the way. Release brakes when wheels up. As soon as the wheels start , apply the brakes fully again. It can take up to second for the wheels to start rolling after you release the brakes.

5.4.4 – Stopping Distance

With air brakes there is an added delay — “Brake .” This is the time required for the brakes to work after the brake pedal is pushed. With air brakes it takes a little time ( second or more) for the air to flow through the lines to the brakes. The total stopping distance for air-brake vehicles is made up of factors: perception, reaction, brake lag and braking distance. The air brake lag distance at 55 mph on dry pavement adds about feet, so at 55 mph the total stopping distance is over feet.

5.4.5 – Brake Fading or Failure

Brakes can or fail from excessive caused by using them too much and not relying on the engine braking effect. Brake fade results from heat causing chemical changes in the brake , which reduce . Brake fade is also affected by .

5.4.6 – Proper Braking Technique

The use of brakes on a long or steep downgrade is only a to the braking effect of the . Once in the proper low gear: apply the brakes just hard enough to feel a definite ; when your speed drops to about mph below your “safe” speed, release the brakes for about seconds; then repeat.

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