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First, you need to determine if that's the problem. If you have a co-driver, or someone who can simply push on a brake pedal, get them to help you. Kneel down at the end of your trailer while they depress the brake (they can use the foot brake or the Johnson bar - it really doesn't matter), and listen for sounds of air escaping. If you hear that, get under the trailer and try to pinpoint whether or not it's coming from the brake chambers.
Obviously, while you do this, you'll have your tractor air pulled out to engage the spring brakes on your tractor, and your emergency/trailer air pushed in so that air continues being delivered to the trailer.
There could be a number of reasons for brake chamber malfunction, but the most common is simply a bad or worn out seal. Inside the brake chambers, an "O" shaped rubber gasket can be found. They do go bad over time.
Your problem might be with your brake chambers, just as it might be a problem with air line crimping or other blockage, or with the brakes themselves (although brake problems don't often happen to all sets of brakes on a trailer at once, but discount no possibilities until you know for certain what it is).
If this is a government-owned vehicle, they probably don't consider this an operator level task, and would have you either take it to your unit maintenance, or they would summon a professional third party entity to conduct the repairs.
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∙ 14y ago
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What is a quick release 1 air brake valve?
QR1 valve is the brake valve to the steer axles. Follow the service lines from the brake chambers to where they intersect, and that's the valve they're both attached to. It meters air to the brake chambers and also governs air pressure in the brake chambers.
How do i move truck with no air for air brakes?
Cage the brake chambers and tow it.
What lever is connected to the brake pedal and controls how much air is sent to the brake chambers?
Treadle valve.
What is a service line in a tractor trailer?
It supplies air to the service chambers of the brake chambers in order to engage the brakes.
What is the cause of air brake leakage?
Faulty air lines, faulty valves, faulty brake chambers, faulty pop off valves on the air tanks
What causes air loss in the primary reservoir when brake is held down on a air brake system?
You'll have an initial loss of pressure in the primary tank, simply because that air is being used to charge the service chambers of the brake cans... a transmission line to the foot valve (pedal or treadle valve, depending on the mounting) transmits air from the foot valve to a relay valve... that air actuates a plunger which opens up the lines to the brake chambers with air already charged into a feeder line. If it continues, then you have an leak either in the service chamber of one or more brake chambers, or a leak in the air line somewhere in the primary air system.
What is air brake overhauling?
The only thing in an air brake system you'd really overhaul would be the compressor itself... the rest of it typically gets replaced. Valves, brake chambers, brake drums, brake shoes, etc.
What does air in brake line do to the brakes?
The air in an air brake system is the "fluid" to activate the brake, much like brake fluid activates the brakes in your car. One difference is that you are not pushing air down the lines when you step on the brake pedal, instead you are releasing a metered amount of air, or "application pressure" from the reservoir, through the treadle valve (brake pedal/valve) to the brake chambers, to apply the brakes. Air also releases the parking brake, as the parking brake is always in the on mode, until you push a valve on the dashboard, sending compressed air to the parking brake chambers, releasing them. The parking brakes are spring powered, and the air over rides these springs.
What are brake chambers?
On an air brake system, the brake chamber is what actuates the air brakes... it converts air pressure to mechanical force, either turning an S-cam (on foundation brakes), or actuating a caliper (on disc brakes).
What cause the 5-15 pounds air loss during air brake testing?
Air being charged to the brake system. When you pull the brake valve, the air in those lines gets purged. When you release the brakes, it has to refill those lines and chambers.
What do I do if there is an air pressure release when I apply the brake?
Assuming you're talking about an air brake system, if this is happening, then you have either a bad service chamber in at least one of your brake chambers, or a compromised supply air line. What to do should be obvious - get it fixed.
Why do you hear air when you push your brake pedal?
Assuming you're in an air brake equipped vehicle, it could be a number of reasons. Loose air line fittings, ruptured air lines, or bad gaskets in one or more brake chambers would be the primary culprits.
