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Newell Gurus
Coach won’t air up - Printable Version

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+--- Thread: Coach won’t air up (/showthread.php?tid=9036)


Coach won’t air up - pairodice - 07-22-2026

Sitting in the warehouse happily. I let the air completely go out of the system. The back comes up to normal ride height but the front is still down and 0 on supply guage :-( I think the compressor is ok since the back and brakes are working; sound like a ride height control or similar; odd that only the front is down on both sides; no air leaks I can hear (I don’t hear so good)… 
What you guys/gals think?

RE: Coach won’t air up - johnkosir - 07-22-2026

I think one of your protection valves is not working not letting air into your supply tank,

RE: Coach won’t air up - pairodice - 07-22-2026

Any idea where the protection valve would be located?

RE: Coach won’t air up - pairodice - 07-22-2026

I called Black Label repair and they sent out two guys that seem to know their stuff. Called Newell and spoke to Tanner and he suggested trying to make the coach go up or down in the rear to maybe break something loose and then the valve
(6 hours ago)pairodice Wrote:  I called Black Label repair and they sent out two guys that seem to know their stuff. Called Newell and spoke to Tanner and he suggested trying to make the coach go up or down in the rear to maybe break something loose and then the air pressure protection valve 
from Grok: air brake system component (pressure protection valve). It protects the primary air system by closing off secondary circuits if pressure drops too low (typically closes around 45 ± 5 PSI). Common in heavy-duty trucks, buses, RVs, and commercial vehicles with air brakes.

•  Ports: Multiple ports (Supply, Delivery, etc.), matching the multi-port cast body in your photo.
•  Cross-reference / Casting: The T-21340-0 and 900328 markings align with OEM castings used on this Bendix valve.
(6 hours ago)pairodice Wrote:  I called Black Label repair and they sent out two guys that seem to know their stuff. Called Newell and spoke to Tanner and he suggested trying to make the coach go up or down in the rear to maybe break something loose and then the air pressure protection valve 
from Grok: air brake system component (pressure protection valve). It protects the primary air system by closing off secondary circuits if pressure drops too low (typically closes around 45 ± 5 PSI). Common in heavy-duty trucks, buses, RVs, and commercial vehicles with air brakes.

•  Ports: Multiple ports (Supply, Delivery, etc.), matching the multi-port cast body in your photo.
•  Cross-reference / Casting: The T-21340-0 and 900328 markings align with OEM castings used on this Bendix valve.