Practice question

Pennsylvania CDL Air Brakes scenario: when should engine retarders (Jake brakes) be used with caution or turned off?

When fully loaded
On wet, icy, or slippery roads, where they can cause the drive wheels to lose traction and skid
When climbing
In daytime

Answer: B — On wet, icy, or slippery roads, where they can cause the drive wheels to lose traction and skid

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