Air Brakes

[98G]

This rules out PPV completely.

 

[Elk1111]

I can’t identify a single part on that truck!!! There’s no rust or dirt or random wires??? I’d hate to touch it because I would be afraid I would get it dirty!!!
Seriously I’m jealous!! That’s one clean truck.

 

[kendelrio]

put my hand up in there when it blows off see if I can see what part it's coming from

Not to be in your business, but you may want to use a sheet of paper or something. There may or may not be fluid that pops out, but hydraulic injection is nothing to play around with.

Just my 2 cents...

 

[Mullaney]

I think the front blow off sound is coming from the dryer I'm going to clean that valve tomorrow but the rear looks to be coming from the rear axle driver side maybe CCTIS maybe. I'm going to crawl up under there tomorrow and put my hand up in there when it blows off see if I can see what part it's coming from

.
What about a squirt bottle with some soapy water in it...
Good way to figure out exactly where the air is coming from.
Possibly with the truck off and shop air connected to the truck?

---

The "blow off sound from up front" that you described is a separate issue from the "rear axle driver side" that you mentioned.

 

[Floridianson]

.
What about a squirt bottle with some soapy water in it...
Good way to figure out exactly where the air is coming from.
Possibly with the truck off and shop air connected to the truck?

---

The "blow off sound from up front" that you described is a separate issue from the "rear axle driver side" that you mentioned.

Yea that one sounds like a governor fart.
Just to add if anyone cares it was in a article I was reading some time ago. Something about a check valve in the air dryer under the in coming compressor line or it could even be under the fitting of out going line depending on make of dryer. You have to remove hose from one or the other and unscrew the fitting that is screwed into the air dryer. That check valve stops the air reversing and going back to the compressor. If it does it can cause the dryer to cycle and purge way to often. As said most of these trucks need air dryer completely taken apart / serviced. That or if you find a steal of a deal replace it.
Sometimes you find the purge valve sticks open different from it cycling and with something that fits up the purge plastic cap you take something small and blunt and push up on the valve. Most of the time it will hold if your lucky. Here to temporary answer but dryer needs service.

 

[3up]

I can’t identify a single part on that truck!!! There’s no rust or dirt or random wires??? I’d hate to touch it because I would be afraid I would get it dirty!!!
Seriously I’m jealous!! That’s one clean truck.

Thank you its been sitting for 3 years too

 

[3up]

So no ideas on the air noises ?? Or was it not what you need to tell?

 

[3up]

Not to be in your business, but you may want to use a sheet of paper or something. There may or may not be fluid that pops out, but hydraulic injection is nothing to play around with.

Just my 2 cents...

Got ya thanks

 

[3up]

Yea that one sounds like a governor fart.
Just to add if anyone cares it was in a article I was reading some time ago. Something about a check valve in the air dryer under the in coming compressor line or it could even be under the fitting of out going line depending on make of dryer. You have to remove hose from one or the other and unscrew the fitting that is screwed into the air dryer. That check valve stops the air reversing and going back to the compressor. If it does it can cause the dryer to cycle and purge way to often. As said most of these trucks need air dryer completely taken apart / serviced. That or if you find a steal of a deal replace it.
Sometimes you find the purge valve sticks open different from it cycling and with something that fits up the purge plastic cap you take something small and blunt and push up on the valve. Most of the time it will hold if your lucky. Here to temporary answer but dryer needs service.

Ok im on it today, can you tell by the pic if its the Original?

 

[3up]

Yea that one sounds like a governor fart.
Just to add if anyone cares it was in a article I was reading some time ago. Something about a check valve in the air dryer under the in coming compressor line or it could even be under the fitting of out going line depending on make of dryer. You have to remove hose from one or the other and unscrew the fitting that is screwed into the air dryer. That check valve stops the air reversing and going back to the compressor. If it does it can cause the dryer to cycle and purge way to often. As said most of these trucks need air dryer completely taken apart / serviced. That or if you find a steal of a deal replace it.
Sometimes you find the purge valve sticks open different from it cycling and with something that fits up the purge plastic cap you take something small and blunt and push up on the valve. Most of the time it will hold if your lucky. Here to temporary answer but dryer needs service.

I should have a better idea after today where its purging from and will post it
Thank you again.

 

[Jbulach]

The noise in the video is your CTIS doing a pressure check. Air is released from the QR vale under the radiator crossmember as well as inside the drivers frame rail above each rear axle. To confirm, with the truck powered down, unplug the cannon plug from the controller mounted on the shift tower.

 

[3up]

Ok thats an easy check
Thank you

 

[Jbulach]

Sorry, I gave you the wrong location for the front CTIS QR valve. It’s on top of the crossmember at the end of my screw driver in the photo. Valve under the crossmember is the brake valve.

 

[Floridianson]

Well since I would bet the air dryer needs a complete service top to bottom was hoping you would just buy a rebuild kit. Then while you are in there then you can check the check valve. The pool water is fine just jump in and sometimes cutting corners will bite you later.

 

[3up]

I didnt know there was a kit. I was just going to replace it but I would rather rebuild it

 

[3up]

Ordered kit today the every 6 second blow off was coming from the bottom of the dryer. Going to fix that then go to next noise

 

[Mullaney]

Ordered kit today the every 6 second blow off was coming from the bottom of the dryer. Going to fix that then go to next noise

.
Not trying to be a pest, but what about the other leak toward the back of the truck?
Maybe hooking a compressor to the truck for quiet time air leak research...

That is cheap. A little soap and a spray bottle and some air.

 

[3up]

Yes im going to do that next I don't hear any leaks after I shut the truck off and it takes a couple of hours for it to lose its pressure so it must be going somewhere, i made a soapy bottle up already. But its 108 here today and im fat so sweat runs in the eyes faster than i can blink bumping my head into shit while trying to wipe the acid out of my eyes. Its not pretty.

 

[Mullaney]

Yes im going to do that next I don't hear any leaks after I shut the truck off and it takes a couple of hours for it to lose its pressure so it must be going somewhere, i made a soapy bottle up already. But its 108 here today and im fat so sweat runs in the eyes faster than i can blink bumping my head into shit while trying to wipe the acid out of my eyes. Its not pretty.

.
Okay, so I am with you 100%. It isn't but in the middle 90's here, but the humidity is 80%. Feels pretty dang awful out there! When you get cooler weather, be sure to spray everything air related on the outside of the firewall. Inside under the dash too.

DOT has a requirement for air percentage leaked in hours, so eventually hunting down those pesky small leaks will be important. No stress right now though. Come On Winter (or fall ) or maybe fifty degree days...

 

[Floridianson]

The noise in the video is your CTIS doing a pressure check. Air is released from the QR vale under the radiator crossmember as well as inside the drivers frame rail above each rear axle. To confirm, with the truck powered down, unplug the cannon plug from the controller mounted on the shift tower.

Yea I was thinking 809 series that let a little girl fart out after shut down. The CTIS one sounds like the fart that needs your shorts changed. Very different.