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Farm Machinery
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Attaching trailer air brakes
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<blockquote data-quote="Captain Sensible" data-source="post: 8157398" data-attributes="member: 107484"><p>Sorry, I'm afraid you're talking about 'dual' pneumatic brake chambers / brake actuators as fitted to Commercial vehicles. They do (as you describe) have one chamber responsible for spring-operation of the Parking Brake and a 2nd chamber which operates the Service Brakes, once the Parking brake has been 'pressurised-off'. That's these sort of things (see below - left).</p><p></p><p>However, at the moment these type of brake actuators are VERY RARELY used on agricultural trailers or trailed implements fitted with dual-line air braking system ... although they are becoming slightly more common on really big stuff. Instead most are fitted with what's known as 'Dual-Supply' brake actuators .... which is a single-acting air chamber with a hydraulic ram grafted onto the front (see below - right). This enables the trailer's brakes to be operated EITHER pneumatically or hydraulically ... NEVER both at same time!. Dual-line air brake systems on towed ag. vehicles still give an emergency/failsafe operation when the Red/Supply line is disconnected, BUT only as long as there is pressure in the trailer reservoir. Once this is depleted you've no brakes.</p><p></p><p>So here's the thing. People who know about air brakes on trucks think that air brakes on tractors & trailer work in exactly the same way. I'm afraid that's not the case. In many respects they do use similar components and the systems might appear to be the same, but THEY ARE NOT THE SAME. Please don't make assumptions ....... it could be dangerous.</p></blockquote><p></p>
[QUOTE="Captain Sensible, post: 8157398, member: 107484"] Sorry, I'm afraid you're talking about 'dual' pneumatic brake chambers / brake actuators as fitted to Commercial vehicles. They do (as you describe) have one chamber responsible for spring-operation of the Parking Brake and a 2nd chamber which operates the Service Brakes, once the Parking brake has been 'pressurised-off'. That's these sort of things (see below - left). However, at the moment these type of brake actuators are VERY RARELY used on agricultural trailers or trailed implements fitted with dual-line air braking system ... although they are becoming slightly more common on really big stuff. Instead most are fitted with what's known as 'Dual-Supply' brake actuators .... which is a single-acting air chamber with a hydraulic ram grafted onto the front (see below - right). This enables the trailer's brakes to be operated EITHER pneumatically or hydraulically ... NEVER both at same time!. Dual-line air brake systems on towed ag. vehicles still give an emergency/failsafe operation when the Red/Supply line is disconnected, BUT only as long as there is pressure in the trailer reservoir. Once this is depleted you've no brakes. So here's the thing. People who know about air brakes on trucks think that air brakes on tractors & trailer work in exactly the same way. I'm afraid that's not the case. In many respects they do use similar components and the systems might appear to be the same, but THEY ARE NOT THE SAME. Please don't make assumptions ....... it could be dangerous. [/QUOTE]
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Attaching trailer air brakes
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