Controlled braking: Light (5-15psi), steady brake application combined with proper gear selection when descending a grade at your safe speed. This method was taught for years but is no longer recommended in the manuals. Done properly, it will not smoke your brakes.
Snub braking: Firm (20-30psi), short (3-5 second) brake applications combined with proper gear selection when going down a grade. Slow to 5mph below your safe speed, release brake, and reapply once you reach your safe speed.
Stab braking: Hard (90+ psi) brake application, release when wheels lock, reapply when they resume rolling, & repeat until stopped. This is for emergency stopping with old (pre ABS) equipmemt with inexperienced drivers. Still mentioned in many cdl manuals, but is poor technique compared to threshold. This IS NOT used to maintain speed downhill!
Threshold braking: Firm (30+psi), steady brake application used for emergency braking. Lift slightly if brakes lock until the tires resume rolling (pre ABS) or maintain pressure at which point you feel/hear ABS begin engaging. The goal is to maintain brake pressure at the point just before the brakes lock up. This results in the shortest stopping distance in an emergency.
Safe speeds for Cabbage Hill:
Pounds..................MPH
60,000 - 65,000 37
65,000 - 70,000 26
70,000 - 75,000 22
75,000 - 80,000 18
Controlled, Stab, Snub, Threshold braking
Discussion in 'Questions From New Drivers' started by double yellow, Nov 20, 2014.
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Reaper'sTrucking, Montgomery, MACK E-6 and 9 others Thank this.
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Great piece of info double yellow,thanks.
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Great! Now what's your question?
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My question is, when i I am descending a mountain and control my speed by stab braking but the wheels aren't locking up, am I doing it wrong?
pattyj Thanks this. -
Ebola Guy, littleduck and pattyj Thank this.
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Montgomery and pattyj Thank this.
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So these brake check areas. Are these just for sleeping and peeing? do they have a purpose?
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gpsman, Hammer166 and Montgomery Thank this.
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pattyj and Montgomery Thank this.
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