Clearly, you can't have juice brakes for a trailer. The old "one line" trailer brakes you are thinking of was for trailers with the old vacuum brakes, which were just as bad. Lot's of straight trucks had juice brakes and hydra-vacs well into the 90's.
Do brake chambers have brake fluid in them?
Discussion in 'Trucking Schools and CDL Training Forum' started by Newtotrucking2020, Dec 5, 2019.
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I'm not going ready this whole s%÷&show but there's fluid in the air brake system during the winter. Tequila works good and you can drink it later. By pass the air dryer. Cheers
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Hydraulics may have higher pressure but its acting on a much smaller surface area and does not have the mechanical advantage of a slack adjuster or the ramps on the S-cam. So kind of a moot point about pressures.
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The correct answers have been given, but to summarize; air brakes are used on semis (and trains) because, unlike passenger vehicles (and straight trucks), they are not "closed" systems. Air is made continuously available and replenishes the system which accounts for system breaks (coupling/uncoupling), leakage, poor maintenance, etc.
Air is compressible... hydraulic fluid is not. Air can NEVER provide pressures even remotely close to that which is achievable with fluid.
So, air is not ideal for providing high pressures, but it is ideal as a continuously supplied "fluid." -
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The Illinois state issued study guide in section 2 says "shoes or pads with oil, grease or brake fluid on them". Then I seen a YouTube pretrip video and the guy mentioned air line and brake fluid line going to brake chamber.
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