The Parts of an Air Brake System
Apr 11, †Ј If you need to put Air brake antifreeze in your truck system do it after the air drier, it will turn the desicant pack to mush if you put it in before. only use straight alcohol in emergengies because it dries the seals out. Air brake antifreeze has lubricants added to prevent this.:bdh. Jan 06, †Ј Make sure the air dryer heater is working and drain your tanks often. If you live where it gets really cold, an air dryer upgrade is a good idea, like a dual cartridge one. It's also not good to use it in the blue line. If the blue line is frozen, you should pull it off the valve(s) so you can blow the alcohol through, then hook it back up.
The air compressor pumps air alcoho the air storage tanks reservoirs. The air compressor is connected to the engine through gears or a v-belt. The compressor jow be air cooled or may be cooled by the engine cooling system.
It may have its own oil supply or be lubricated by engine oil. If the compressor has its own oil supply, check the oil level before driving. The governor controls when the air compressor will pump air into the air storage tanks. Air storage tanks are used hod hold compressed air. The number and size of air tanks varies among vehicles. The tanks will hold enough air to allow the brakes to be used several times, even if the compressor stops now.
Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system. For example, the water alfohol freeze in cold weather and cause brake failure. The water and oil tend to collect in the bottom of the air tank. Be sure that you drain the air tanks completely. Each air tank is equipped with a drain valve in the bottom. There are two types:. Automatic air tanks are available with electric heating devices.
These help prevent freezing of the automatic drain in cold weather. Some air brake systems have an alcohol evaporator to put alcohol into the air system. This helps to reduce the risk of ice in air brake valves and other parts during cold weather. Ice inside the system can make the brakes stop working. Check the alcohol container and fill up as necessary, every day during cold weather. Daily air tank drainage is still needed to get rid of water and oil. Unless the system has automatic drain valves.
A safety relief valve is installed in the first tank the air compressor pumps air to. The safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at psi. If the safety valve brakds air, something is wrong. Have the fault fixed by a mechanic. You put on the brakes by pushing down the brake pedal. It is also called the foot valve or treadle valve.
Pushing the pedal down harder applies more air pressure. Letting up on the brake pedal reduces the now pressure and releases the brakes. Releasing hod brakes lets some compressed air go out of the system, so the air pressure in the tanks is reduced. It must be made up by the air compressor. Pressing and releasing the pedal unnecessarily can let air out faster than the compressor can replace it.
Foundation brakes allcohol used at each wheel. The most common type is the s-cam drum brake. The parts of the brake are discussed below. Brake Drums, Shoes, and Linings. The wheels are bolted to the drums. The braking mechanism is inside the drum.
To stop, how to make a shoebox train brake shoes and linings are pushed against the inside of the drum. This causes friction, which slows the vehicle and creates heat. The heat a drum can take without damage depends on how hard and yo long the brakes are used.
Too much heat can make the brakes stop working. S-cam Brakes. When you push the brake pedal, air is let into each brake chamber. Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake camshaft. The s-cam forces the brake alcogol away from one another and presses them against the inside of the brake drum.
When you release the brake pedal, the s-cam rotates back and a spring pulls the brake shoes away from the drum, letting the wheels roll freely again. See Figure 5. Wedge Brakes. In this type of brake, the brake chamber push rod pushes a wedge directly between the ends of two brake shoes. This shoves them apart and against the inside of the brake drum.
Wedge brakes may have a single brake chamber, or two brake chambers, pushing wedges in at both ends of the brake shoes. Wedge type brakes may be self-adjusting or may require manual adjustment. Disc Brakes. In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like s-cam brakes.
The pressure of the brake chamber on the slack adjuster turns the power alclhol. The power screw clamps the disc or rotor between the fo lining pads of a caliper, similar to a large c-clamp.
All vehicles with air brakes have a pressure gauge connected to the air tank. If the vehicle has a dual air brake system, there will be zir gauge for each half ptu the system. Or a single gauge with two needles.
Dual systems will be discussed later. These gauges tell you alcoyol much pressure is in the air tanks. This gauge shows how much air pressure you are applying to the how to put alcohol in air brakes. This gauge is not on all brskes.
Increasing application pressure to hold the same speed means the brakes are fading. You should bbrakes down and use a lower gear. The need for increased pressure can also be caused by brakes out of adjustment, air leaks, or mechanical problems. A low air pressure warning signal upt required on vehicles with air brakes.
A warning signal you can see must come on before the air pressure in the tanks falls below 55 psi. Or one half the compressor governor cutout pressure on older vehicles. The warning is usually a red light. A buzzer may also come on. An automatic wig wag will rise out of your view when the pressure in the system goes above 55 psi. It will not stay in place until the pressure in the system is above 55 psi.
Drivers behind you must be warned when you put your brakes on. The air brake system does this with an electric switch that what is the pattern for the nether reactor by air pressure. The jn turns on the brake lights when you put on the air brakes. Some how to make a girl break up vehicles made before have a front brake limiting valve and a control in the cab.
Limiting valves were used to reduce the chance of the front wheels skidding on slippery surfaces. However, they actually reduce the stopping power of the vehicle. Front jow braking is good under all conditions. Tests have shown front wheel skids from braking are not likely even on ice. Many vehicles have automatic front wheel limiting valves. They reduce the air to the front brakes except when the brakes are put on very hard 60 psi or more application pressure.
Brakez valves cannot be controlled by the driver. All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.
They must be held on by mechanical force because air pressure akr eventually leak away. Spring brakes are usually used to meet these needs. When driving, powerful springs are held back by air pressure. If the air pressure is removed, the springs put on the what does it mean to reconcile a checking account. A parking brake control in the cab allows the driver to let the air out of the spring brakes.
This how to start a fashion line for kids the springs put the brakes on. A leak in the air brake system, which causes bbrakes the air to be lost, will also cause the springs to put on the brakes. Tractor and straight truck spring brakes will come fully on when air pressure drops to a range of 20 to 45 psi typically 20 yo 30 psi. Do not wait for the brakes to come on automatically. When the low air pressure warning light and buzzer first come on, bring the vehicle to a safe stop right away, while you can still control the brakes.
5.1.1 Ц Air Compressor
Jan 29, †Ј This liquid contains little alcohol so it doesn't freeze in winter weatherUse it whenever temperature is around freezing point to prevent from trailer brake. Some air brake systems have an alcohol evaporator to put alcohol into the air system. This helps to reduce the risk of ice in air brake valves and other parts during cold weather. Ice inside the system can make the brakes stop working. Check the alcohol container . Place it after the air dryer if one is installed on the truck. The alcohol evaporates as pressurized air passes through the unit. Then, the alcohol vapor is carried down the line into the reservoir and air lines where it does its work to prevent ice buildup in the air brake system.
Discussion in ' Trucks [ Eighteen Wheelers ] ' started by anothercupajoe , Jan 4, Each company we work with has specific experience requirements for their drivers. In order for you to receive the best possible offers, please make sure your answers above are accurate prior to submitting. Log in or Sign up. Find Trucking Jobs. Jan 4, 1. Hi everyone, I live in a freezer - no seriously. The other day my trailer brakes froze up and the mechanic that showed up to help pulled a length of hose out with a glad hands connection on either end and in the middle was a female connection to screw a quart of alcohol into.
He pushed that quart into the brake lines inside a minute. I'm not kidding - a freezer - it took 2 quarts and 40 minutes before the brakes broke free. So where would a guy find the doo dad with a nipple on either side for hose connect and a threaded doo hikee that a quart bottle would screw into? I know; I should've asked him.
I also should've bought Apple at Name Email Phone Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided. There is no charge for this service, but standard message and data rates may apply.
Jan 4, 2. You live up on the iron range? You could get a glad hand with a short line and somehow put a funnel on the end? Jan 4, 3. First try bleeding your tanks. If your dont and it keeps building up it will freeze up your dryer to and it wont release air pressure. Now your looking at putting alcohol straight in to the air compressor. LandShark , Jan 4, Jan 4, 4. I don't know where you'd get one, but it's not good to use airline anti-freeze often, it's hard on air bags and chamber diaphragms.
It has its use for emergencies, but if you have to use it often, you may need to service or replace the air dryer. Make sure the air dryer heater is working and drain your tanks often. If you live where it gets really cold, an air dryer upgrade is a good idea, like a dual cartridge one. It's also not good to use it in the blue line. If the blue line is frozen, you should pull it off the valve s so you can blow the alcohol through, then hook it back up. It wont get water out since it has no where to go.
Once the alcohol evaporates, it can freeze up again. Another thing to check is your air compressor coolant hoses. Cats are good for the steel braiding rusting up. A hotter compressor makes more condensation. If the hoses are brittle, cracking or swelled up, replace them. GrapeApe , Jan 4, Jan 5, 5. Most every truck dealership should carry air line antifreeze it is suppose to have some kind of lube in it, Personally, you can get Menthol Hydrate at a hardware store, pore it in the emergency line, on the truck , connect the line pore some in the service line and connect it, charge the trailer and apply the brakes.
The air system you have to drain the tanks all year long when ever you are parked on an incline drain the tanks that the drain is at the low end. Drain the trailer tanks as well. Once it is cold out and the system has not been maintained it is a little late, Preparation, and maintenance does work.
Just a thought! JohnP3 , Jan 5, Jan 5, 6. Hey thanks for that. I was thinking about this in the wrong way. I did only want to have the ability to add anti-freeze in this way in emergency situations.
Now that its frozen outside and there isn't much I can do - without getting it in and warming it up to dry it out - I was still wondering if maybe someone had seen an appliance like the mechanic's Super Anti-freeze Injector. Jan 5, 7. GrapeApe , Jan 5, Jan 6, 8. Jan 6, 9. Jan 6, Bendix used to make those but not any more probably because they frown on adding anything to the brakes system.
Semi Crazy , Jan 6, Show Ignored Content. Draft saved Draft deleted. Your username or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?