Air leak from brake exhaust

[Robert & Dianne]

Hello again
Couldn't wait until Saturday to get pictures...too anxious
To my photo album I uploaded six pictures of tube and one picture of yellow hose that when moved air escapes from the tube.
I was wrong...(please don't let my wife Dianne know) the tube seems to go up behind metal support which is in front of steering column and into the right side facing of the dash. There are three tubes coming out of support and going up. Can't follow from bottom because they are surrounded in foam as they exit floor and support.
Today when I put my finger over end of tube and then released I could hear what seemed to be a movement of the front drivers side brake. The bus didn't have much air in it and the sound was faint. Don't know if this helps to know.
As a side note if someone could tell me what the two junction air "boxes" are (what they go to) in the pictures and what the yellow hose in last picture goes to I would be grateful.

As always...thanks for your time

Robert

[Bill Pape]

the 8 port manifold is just a junction block for air distribution.
tighten all the copper fittings, the plastic has a white ring, push in and pull out the plastic line, cut a new straight edge and reconnect. the white switch with two wires is a low air buzzer switch it can also leak.

[Robert & Dianne]

Thank you. Any ideas as to the single tube hanging down or yellow hose?

[Bill Pape]

I do not remember air in that area, Cat yellow near the injection pump is usually fuel line

[Bill Pape]

Originally Posted by Robert & Dianne

Hello again
Couldn't wait until Saturday to get pictures...too anxious
To my photo album I uploaded six pictures of tube and one picture of yellow hose that when moved air escapes from the tube.
I was wrong...(please don't let my wife Dianne know) the tube seems to go up behind metal support which is in front of steering column and into the right side facing of the dash. There are three tubes coming out of support and going up. Can't follow from bottom because they are surrounded in foam as they exit floor and support.
Today when I put my finger over end of tube and then released I could hear what seemed to be a movement of the front drivers side brake. The bus didn't have much air in it and the sound was faint. Don't know if this helps to know.
As a side note if someone could tell me what the two junction air "boxes" are (what they go to) in the pictures and what the yellow hose in last picture goes to I would be grateful.

As always...thanks for your time

Robert

Use a spray bottle of soapy water to find leaks

[Robert & Dianne]

Bill, I know where the leak is...at the end of the black tube. What I don't know is where the tube goes and what is causing it to exhaust air.

[Bill Pape]

Sorry Robert, but I also am confused about the black air line.
Need to find the source. when removing the front inspection plate above the headlight, there is an air operated air damper this disconnected line will leak air

[gcyeaw]

There are two connections at the treddle valve for stop light switches (one for the front brakes and one for the rear brakes, wired in parallel so either one will light the lights.). Is it possible someone replaced one or both at some time and mounted them remotely to make it easier if they failed again? That would then make sense for a small air line connected to the treddle valve. This line would then leak when the brakes are applied, but not when they are not applied unless there is some other leak supplying pressure to the brake side of the valve.

Is there a pressure switch hidden near where that tube is with no air line on it? Probably a round disc shape with two wire connections and an air line connection.

[Chap]

Originally Posted by gcyeaw

There are two connections at the treddle valve for stop light switches (one for the front brakes and one for the rear brakes, wired in parallel so either one will light the lights.). Is it possible someone replaced one or both at some time and mounted them remotely to make it easier if they failed again? That would then make sense for a small air line connected to the treddle valve. This line would then leak when the brakes are applied, but not when they are not applied unless there is some other leak supplying pressure to the brake side of the valve.

Is there a pressure switch hidden near where that tube is with no air line on it? Probably a round disc shape with two wire connections and an air line connection.

Gardner,
Do you suppose they might have run an exhaust line to the outside from the parking brake valve. Mine just dumps behind the dash, but if that is where it goes and his parking brake valve is leaking internally that might explain it.

[Bill Pape]

Originally Posted by Chap

Gardner,
Do you suppose they might have run an exhaust line to the outside from the parking brake valve. Mine just dumps behind the dash, but if that is where it goes and his parking brake valve is leaking internally that might explain it.

Chap that maybe,& it is possible, but it is a small line, anything can happen by previous owners & RV mechanics