Re: Questions about AIR BRAKES ???

Posted by john in la on January 12, 2006 at 05:45:18 from (66.157.26.86):

In Reply to: Re: Questions about AIR BRAKES ??? posted by Allan in NE on January 12, 2006 at 04:29:21:

No Allen the concept has been the same for many years.
The system you are thinking of is used on trains or at least I think it is. With a mile of cars you would need a lot of air storage to apply brakes so they use the remove air spring apply system.

But in large trucks this is not so because we need response quickly and the system is small enough to have storage capacity.
On a modern truck their is 2 types of brake chambers. 1 is for stopping only (small one) with 1 chamber; and 1 has 2 chambers. 1 for stopping and 1 for spring parking brakes.

Lets look at a trailer as it is easier to explain.
You build pressure in the truck and push in the red valve. This supplies a constant supply of air through the red hose which in turn releases the spring parking brakes. If this supply of air is ever loss the parking brakes will set under spring pressure. This is one system.
Now we have a totally different system that uses the blue hose. When you push on the foot valve air is sent through the blue hose to the brake chamber. This air pushes on a diaphragm which pushes on a rod that activates the brakes.

Concept of Air Brake System 1

Concept of Air Brake System 2

Replies:

• Re: Questions about AIR BRAKES ??? Leland 10:55:18 01/12/06 (0)
• Re: Questions about AIR BRAKES ??? Island A 10:47:47 01/12/06 (0)

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