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Feeders - Proper coupling/uncoupling procedure?
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<blockquote data-quote="moldsporh" data-source="post: 2165058" data-attributes="member: 54834"><p>When you push on the red handle, this allows air from the tanks to fill the brake chambers on the trailer, this air pressure compresses the parking/emergency brake spring and releases the parking brakes on the trailer. When you pull the red handle, you hear the big escape of air because the spring is setting and forcing the air out of the chamber and red lines.</p><p></p><p>Now what gets confusing.... with the red handle still pressed in, when you lower the hand valve, you apply the brakes to the trailer and the dolly if attached. This is possible because the parking prake chambers are called "Maxi" chambers which have 2 separate functions and are distinguishable by their large size....steer axle and dolly axle have service brake chambers only and are half the size.</p><p></p><p>The hand valve does not apply brakes to the tractor, it only allows air to flow through the blue lines behind the cab which is the same air as when you step on the brake pedal...only difference is when you step on the brake pedal, all brake chambers apply brakes, with the hand valve, only trailers and dolly get brakes applied.</p><p></p><p>The hand valve will only flow air from the blue lines if the red valve is pressed, the red valve is a combination valve. If the red valve is pulled out and you apply the hand valve, no air flows and only the brake lights are applied. The red valve basically "turns on" the hand valve and let's it flow air when pressed in.</p><p></p><p>So with the trailers hooked up, the hand valve supplies air to the blue lines and is verified by airflow from the rear trailer blue line valve. The red button pressed in supplies air to the emergency side and is verified by opening the red valve at the rear trailer.</p><p></p><p>You want to ensure air flows from the rear trailer, whether single or as a set.</p><p></p><p>But again, if you forget to push the red valve in, you won't get air from the hand valve either.</p></blockquote><p></p>
[QUOTE="moldsporh, post: 2165058, member: 54834"] When you push on the red handle, this allows air from the tanks to fill the brake chambers on the trailer, this air pressure compresses the parking/emergency brake spring and releases the parking brakes on the trailer. When you pull the red handle, you hear the big escape of air because the spring is setting and forcing the air out of the chamber and red lines. Now what gets confusing.... with the red handle still pressed in, when you lower the hand valve, you apply the brakes to the trailer and the dolly if attached. This is possible because the parking prake chambers are called "Maxi" chambers which have 2 separate functions and are distinguishable by their large size....steer axle and dolly axle have service brake chambers only and are half the size. The hand valve does not apply brakes to the tractor, it only allows air to flow through the blue lines behind the cab which is the same air as when you step on the brake pedal...only difference is when you step on the brake pedal, all brake chambers apply brakes, with the hand valve, only trailers and dolly get brakes applied. The hand valve will only flow air from the blue lines if the red valve is pressed, the red valve is a combination valve. If the red valve is pulled out and you apply the hand valve, no air flows and only the brake lights are applied. The red valve basically "turns on" the hand valve and let's it flow air when pressed in. So with the trailers hooked up, the hand valve supplies air to the blue lines and is verified by airflow from the rear trailer blue line valve. The red button pressed in supplies air to the emergency side and is verified by opening the red valve at the rear trailer. You want to ensure air flows from the rear trailer, whether single or as a set. But again, if you forget to push the red valve in, you won't get air from the hand valve either. [/QUOTE]
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Feeders - Proper coupling/uncoupling procedure?
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