It applies the trailer brakes. Think service brake that only affects the trailer. I only use it to apply the brakes during my pretrip to check the brakes and brake lights. Other than that, I don't use it. Pulling in while driving can have some bad consequences.
It's as Banks explained. It is good for doing the "Tug Test" and also when adjusting the trailer tandems.
A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".
A set of axles spaced close together, legally defined as more than 40 and less than 96 inches apart by the USDOT. Drivers tend to refer to the tandem axles on their trailer as just "tandems". You might hear a driver say, "I'm 400 pounds overweight on my tandems", referring to his trailer tandems, not his tractor tandems. Tractor tandems are generally just referred to as "drives" which is short for "drive axles".
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I’ve never used this lever, but I’d like to know what value it has and in what situations it is normally used.