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Ask a Feeder Driver, Feeder Driver FAQ
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<blockquote data-quote="Jones" data-source="post: 2739112" data-attributes="member: 4805"><p>There are 2 separate brakes on the trailer, the air brakes and the mechanical spring brakes. Putting air to the trailer (red valve) releases the spring brakes, while using the hand valve (or the brake pedal) engages the air brakes. That's why you do a tug test <em>and</em> a hand valve test. The tug test checks the spring brakes (in addition to verifying your couple) while the hand valve test checks your air brakes.</p></blockquote><p></p>
[QUOTE="Jones, post: 2739112, member: 4805"] There are 2 separate brakes on the trailer, the air brakes and the mechanical spring brakes. Putting air to the trailer (red valve) releases the spring brakes, while using the hand valve (or the brake pedal) engages the air brakes. That's why you do a tug test [I]and[/I] a hand valve test. The tug test checks the spring brakes (in addition to verifying your couple) while the hand valve test checks your air brakes. [/QUOTE]
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