Which Way Should Air Flow In Blue Service Line For Semi Trailers

#4 01-26-2009, 03:05 AM

Quote:

Originally Posted by jeet View Post

I have a century class, lately its leaking air big fourth dimension (from bluish line behind bunk ), every time i pace on brake padle ( bob tailing ). Air even leaks when yellow and red dash buttons are pulled out and I footstep on brake padle. Any idea what might exist causing it... Thanks

Yellow nuance valve should have nothing to practice with it, BUT, it sure sounds like a faulty Ruby Nuance Valve.

Of course, they are not a single unit anymore, they are a module. so If you swap one out, then the other goes with it.

There is no air to the Tractor Protection Valve UNTIL you push button in the scarlet dash valve. Until then, information technology works like a seal. One time you put air to the Supply (red) and then it moves a slider which enables air to come out of the service (Blue) when you make a brake application.

Could exist the TP, but more than likeley it is the Dash valve.

Practise you lot hold the trailer in RED, when you lot dynamite the tractor Yellow, and so pull the Red to ready the trailer brakes. If you do, at that place is a actually good take chances that is what caused it.

Proper procedure for setting your parking brakes, Tractor with Trailer attached is as follows

Pull yellowish, red will almost always follow.

Even if you need Air in the trailer for some reason, y'all need to prepare Yellow (red follows) so push the red dash valve dorsum in to release the parking brakes at that time.

I encounter it often where guys come in and hold their thumb on the Ruby button while they pull the Yellowish button with the centre two index fingers, then pull the Red out.

I take module nuance valve prepare in my store that I utilize to show what happens when yous exercise it. They eventually leak.

The manufacturers sent out notices years ago that it is not appropriate to hold in Red, while you dynamite Yellow.

#5 01-26-2009, 10:nineteen PM

I'm gonna vote for the tractor protection valve.

I'thousand non understanding how nuance-valve delivery air (trailer supply from ruddy button) is getting to the blueish line (trailer service from treadle) without a TPV internal leak? Both the supply and service air flow through the TPV, but should be isolated from each other.

#7 01-27-2009, 03:20 AM

Quote:

Originally Posted by bob h View Post

I'm gonna vote for the tractor protection valve.

I'chiliad non agreement how nuance-valve delivery air (trailer supply from red button) is getting to the blue line (trailer service from treadle) without a TPV internal leak? Both the supply and service air menses through the TPV, just should be isolated from each other.

I rethought this. so traced it at work on my Air Board.

If, air is leaking through the red dash valve, activating the TPV, which is then assuasive air to movement through the blueish line, there would besides have to exist air loss on the cerise line. (Bobtailing)

If, air is leaking ONLY through the blueish line, and so it would probably have to exist the TPV is leaking on the blue side.

I concur, sounds like a TPV to me also.

In other words.

Red nuance valve is out, and air is leaking through the red glad mitt, the culprit is probably the Red Dash Valve. When you make a brake application, air would besides come out the Blue glad hand.

Red dash valve is out, a brake application is fabricated, and air is leaking through the blue glad hand ONLY, the culprit is probably the TPV itself.

Red dash valve is IN (NO BRAKE APPLICATION), air is coming forcefully out the carmine dash valve, and at that place is air coming out of the bluish glad hand, and then the leak is internally in the TPV, between the Supply and the Service side.

When yous teach air brakes, the TPV and the Bound Brake Modulator are the most fun to teach.

#9 02-01-2009, 08:27 PM

Quote:

Originally Posted by RockyMtnProDriver View Post

I rethought this. and so traced it at work on my Air Board.

If, air is leaking through the scarlet dash valve, activating the TPV, which is then assuasive air to move through the blue line, there would too have to exist air loss on the red line. (Bobtailing)

If, air is leaking Just through the blue line, then information technology would probably accept to be the TPV is leaking on the bluish side.

Even if the cherry nuance valve leaks out to the TP control port, there is yet no air on the blue line unless a service restriction application is made.

So, in gild for air to leak out the bluish line, you lot would require a 'second' leak; the first leak is through the red nuance valve, the second leak through the foot valve (where the bluish air comes from), and it's VERY unlikely that foot valve air would leak from 'supply' to 'commitment'.

#10 02-01-2009, 08:36 PM

Quote:

Originally Posted by bob h View Post

Even if the red dash valve leaks out to the TP control port, there is all the same no air on the blue line unless a service restriction application is made.

So, in order for air to leak out the blueish line, you would crave a '2nd' leak; the outset leak is through the red nuance valve, the second leak through the foot valve (where the bluish air comes from), and it's VERY unlikely that foot valve air would leak from 'supply' to 'delivery'.

And if the pes valve was leaking across from supply to delivery, the tractor service brakes would be practical.

Which Way Should Air Flow In Blue Service Line For Semi Trailers

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