Q
10. Retarders:
General Knowledgemedium
ACause extra brake wear.
BAllow you to disconnect the steering axle brakes.
CCan cause the drive wheels to skid when they have poor traction.
Detailed Explanation
Retarders slow the drive wheels and reduce service-brake use. Turn them off on wet, icy or snow-covered roads.
Official reference: Oregon CDL Manual 2.3.4: RetardersCorrect Answer: Can cause the drive wheels to skid when they have poor traction.
Why This Matters on the CDL Test
Drive-wheel grip.
How to Remember It
Slippery: retarder off.
Answer Review
Retarding force can exceed traction.
Why the other answers are weaker
- Cause extra brake wear.They reduce service-brake use.
- Allow you to disconnect the steering axle brakes.Retarders do not replace brakes.
Test-Day Checklist
- Read the question once for the topic, then read it again for the exact CDL action being tested in General Knowledge.
- Eliminate answers that sound convenient but skip an inspection, warning sign, or safety step.
- Say the correct rule out loud before moving on so you can recognize it when the exam changes the wording.
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167. Retarders keep you from skidding where the road is slippery.
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359. Retarders are used to:
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435. Retarders:
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Keep Studying General Knowledge
Question pages help you review one rule at a time. To build test-day speed, move back into the full General Knowledge practice test and answer a mixed set without looking at the explanation first.
State CDL Practice Paths
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