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Start here
What you will be able to do
- Prepare the vehicle and route before a mountain grade.
- Explain why speed and gear must be selected before descent.
- Recognize brake fade and loss-of-control warning signs.
- Use escape routes and stop decisions without hesitation.
Working vocabulary
Key terms before you begin
- Grade
- The steepness of a roadway incline or decline, usually expressed as a percentage.
- Brake fade
- Reduced braking effectiveness caused by excessive heat or another system problem.
- Retarder
- A supplemental device or system that helps slow the vehicle without relying only on service brakes.
- Escape ramp
- A roadway facility designed to help stop a vehicle that cannot control speed on a downgrade.
01
Study the grade before arrival
Review grade length and steepness, curves, weather, construction, chain controls, runaway-truck ramps, safe pullouts, and traffic. Know vehicle weight, brake condition, transmission, engine-braking or retarder instructions, and company policy.
- Complete brake, tire, air, fluid, and load inspection
- Secure cargo and confirm balance
- Identify escape ramps before the descent
- Plan a safe speed using vehicle, load, grade, road, and weather
02
Select speed and gear before descent
Gravity adds speed continuously on a downgrade. Slow while the vehicle is still controlled and select the proper gear before entering. Attempting a downshift after speed has built can fail and leave the driver with fewer controls.
03
Protect the service brakes
Use the engine’s braking effect and approved supplemental systems as conditions and manufacturer guidance allow. Apply the current recommended snub or controlled braking technique rather than holding light continuous pressure that builds heat. Never descend in neutral.
- Stay within the planned safe-speed range
- Use firm, controlled applications as the procedure directs
- Release to allow cooling between applications
- Do not rely on a retarder where slippery conditions or instructions make it unsafe
04
Detect loss of capacity early
A burning smell, smoke, pull, need for increasing pedal effort, pressure problem, unexpected acceleration, or inability to hold the planned speed can signal a dangerous condition. Do not continue hoping it improves lower on the grade.
05
Manage upgrades and stops
On an upgrade, select a gear that maintains controlled engine operation and avoid blocking traffic when a safe slower lane is available. If stopping after a demanding grade, use a safe location, inspect for heat or damage without touching hot components, and do not proceed until the system is safe.
- Watch engine temperature and warning indications
- Avoid sudden lane changes around slower traffic
- Secure the vehicle fully at a stop
- Report and correct brake or equipment concerns
Put the lesson to work
The speed keeps returning
Midway down a long grade, each brake application reduces speed briefly, but the vehicle accelerates back faster and a hot odor is developing. An escape ramp is ahead.
Safe decision sequence
- 1Recognize possible brake overheating and declining control.
- 2Use the approved braking and warning actions while remaining in control.
- 3Take the escape ramp rather than passing it to attempt the rest of the grade.
- 4Notify emergency and carrier resources after the vehicle is secured.
Why this works
The ramp is part of the planned safety system. Waiting for complete brake failure removes the safest remaining option.
Retrieve before you review
Check your understanding
Answer each question aloud or in writing, then open the explanation.
1.When should the descent gear be selected?Show answer
2.Why is continuous light brake pressure risky on a long downgrade?Show answer
3.When should an escape ramp be used?Show answer
Lesson recap
Carry these decisions forward
- Inspect and plan before the grade.
- Choose speed and gear before descent.
- Protect brake capacity with the approved technique.
- Use the escape ramp when control is threatened.
Continue deliberately
Choose your next step
Review the explanation you still need, return to the library, or move to the next lesson when you can explain the safe decision in your own words.
Official references used to review this lesson
Reviewed August 26, 2026. The instruction is provided above; these links document the current sources checked and help you verify state- or operation-specific requirements.
Educational preparation only. This lesson does not replace your current state handbook, vehicle-specific instruction, employer procedures, federal or state regulations, supervised practice, or required ELDT. It does not guarantee a test result, license, job, or certification.