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Old 05-24-2022, 01:45 PM   #1
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Loud Air Pop / Snap Coming from Front Right Brake?

Took our coach out for some exercise today, as I try to ensure it gets driven at least once every 2-3 weeks. Next trip isn't until 6/8.

After about 10 miles or so, I heard a loud air POP when I applied the brakes. It did it again 2 more times, and then seemed to go away. However, I did not drive it very far after it started. Sounds like it was coming from the front right brake area.

Brakes worked fine, and the coach did not pull with brakes applied.

Hoping there is some sort of pressure relief valve that I have not heard before? Any ideas?

I am going to under there tomorrow to inspect the air lines, etc.

Thanks.
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Old 05-24-2022, 01:58 PM   #2
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You can have something going on with the slack adjuster on the brake chamber. I would inspect the S cam.
We just had an Entegra customer and his gen slide did not work. He heard a loud pop in the air suspension and then his gen slide started working. Check the norgren valves on the firewall and if you continue to hear the popping, need to get an authorized service center for repair.
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Old 05-26-2022, 09:17 AM   #3
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Quote:
Originally Posted by Bobby Dowdle View Post
You can have something going on with the slack adjuster on the brake chamber. I would inspect the S cam.
We just had an Entegra customer and his gen slide did not work. He heard a loud pop in the air suspension and then his gen slide started working. Check the norgren valves on the firewall and if you continue to hear the popping, need to get an authorized service center for repair.
Bobby: Thanks for the reply. Can you clarify what I should look for on the front disc brake? Also, I was disappointed to find that 2 of my air lines on the driver's side were wrapped around a bolt / bracket. The blue line in the picture is almost worn through and completely pinched. I think there is enough slack in it to where I can cut it and reconnect.

What does the mechanism do in the 2nd picture? Does it move / actuate somehow or is it stationary? Also, do you know what this blue and yellow line run to / operate?

Thanks!
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Old 05-26-2022, 09:22 AM   #4
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That’s a ride height valve. The hoses are pushed into quick connect fittings. If you have enough slack, remove them and cut back the bad part and push back into the connectors. If not, get 1/4” air line quick connect couplers and cut out the bad area and push back together. Make sure you secure those so that rod doesn’t make contact with them anymore. The rod moves up and down and is what tells the air bags to inflate or deflate.
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Old 05-26-2022, 09:24 AM   #5
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Quote:
Originally Posted by Bobby Dowdle View Post
That’s a ride height valve. The hoses are pushed into quick connect fittings. If you have enough slack, remove them and cut back the bad part and push back into the connectors. If not, get 1/4” air line quick connect couplers and cut out the bad area and push back together. Make sure you secure those so that rod doesn’t make contact with them anymore. The rod moves up and down and is what tells the air bags to inflate or deflate.
Thanks!!!
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Old 05-26-2022, 09:30 AM   #6
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You KNOW that lever is going to rip the yellow line loose don't you !
Zip tie the yellow and blue lines AWAY from the sensing lever !!!!!
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Old 05-26-2022, 10:42 AM   #7
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Quote:
Originally Posted by Bobby Dowdle View Post
That’s a ride height valve. The hoses are pushed into quick connect fittings. If you have enough slack, remove them and cut back the bad part and push back into the connectors. If not, get 1/4” air line quick connect couplers and cut out the bad area and push back together. Make sure you secure those so that rod doesn’t make contact with them anymore. The rod moves up and down and is what tells the air bags to inflate or deflate.
And the "after" photo. I will check to ensure the rod end no longer contacts or can hook the hoses next time I run it. Thanks again for your quick help on this.
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Old 05-26-2022, 10:43 AM   #8
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You KNOW that lever is going to rip the yellow line loose don't you !
Zip tie the yellow and blue lines AWAY from the sensing lever !!!!!
Yes indeed. I had to remove the rod in order to get the yellow line untangled. Took the photo before I did that.
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Old 05-26-2022, 10:53 AM   #9
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The arm/rod moves as you drive down the road and will move when you dump air. The air lines need to be secured away from the arm/rod.
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Old 05-26-2022, 01:49 PM   #10
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Holy cow, that’s messed up. Amazing. Headed out to look at mine now. Sheesh.
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Old 05-26-2022, 03:29 PM   #11
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Quote:
Originally Posted by Flyer15015 View Post
You KNOW that lever is going to rip the yellow line loose don't you !
Zip tie the yellow and blue lines AWAY from the sensing lever !!!!!
That was a good catch! I looked right at that picture and I missed it! Maybe its time to get my eyes checked!!!!
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Old 05-26-2022, 03:33 PM   #12
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Quote:
Originally Posted by USMCRET View Post
Holy cow, that’s messed up. Amazing. Headed out to look at mine now. Sheesh.
Let us know what you find.
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Old 05-26-2022, 03:43 PM   #13
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UPDATE

Took the coach for a test drive, and I did not get the loud pop sound - hoping that was a fluke.

My initial reroute of the air lines did not work for the yellow line. The ride height arm goes to horizontal at ride height, and it was right back to grabbing the yellow line.

I was actually tempted to "reverse" the L-shaped arm to gain more clearance, but I did not want to change the geometry too much.

I ended up doing 2 things that should do the trick. 1) I ran the ball studs all the way out, so the back of the bolt would not catch the lines. 2) I removed a large wire tie that was used to secure the lines to a frame bolt, allowing me to move the lines closer to the frame.

Glad I caught this, as it could have led to a major breakdown and a tow.

See pics...

As a side note, I believe the blue line that was severely pinched had something to do with my dump valve. The bags dumped much faster when I hit Auto Level this last time.

Now I need to find the one for the rear suspension, so I can check it! Anyone know exactly where it is?
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