When I was driving to the truckstop, I thought that maybe the air compressor on the truck is defective. But now I don't think that the air compressor is defective. If the air compressor was defective, I don't think the primary air line would have 120 psi with the engine turned off.
I think you are right that there is a leak of some kind.
Air pressure in secondary line won't go up to normal level
Discussion in 'Freightliner Forum' started by expedite_it, Sep 13, 2024.
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@Rideandrepair
@Ridgeline
Does anyone have any idea as to why the air pressure in both the primary and secondary air lines rose almost to normal pressures when I idled the truck engine for about two or three minutes to microwave food last night?
The mechanics have not worked on the truck yet. I don't get it. I am baffled.Last edited: Sep 14, 2024
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Crude Truckin', Kyle G. and expedite_it Thank this. -
About 4 days ago, I accidentally drove my semi-truck all day with the air bags dumped. Do you think that my driving with the air bags dumped all day could have caused the leak?
@Ridgeline
@RideandrepairLast edited: Sep 14, 2024
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The photograph above is a photograph that I took of my truck about an hour ago. The air pressure in the secondary dropped overnight to 25 psi.
I found the photograph below this sentence on my cell phone. The photograph below is a photograph of a different Freightliner truck than the Freightliner truck I have now. On this Freightliner truck four years ago, both the primary and the secondary air pressures were at about 120 psi with the engine off. I think that is how my current truck would normally be with the engine off.
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So the two photographs on this post are photographs of two different trucks, but both of the trucks are Freightliner Cascadias.Last edited: Sep 14, 2024
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Rideandrepair Thanks this.
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Dump your suspension switch if you have one,if the pressure goes back to normal then your suspension has a leak.If you don't have the dump switch you can chock the wheels ,release the brakes,and look for the leak.
expedite_it Thanks this. -
I'm assuming "dump your suspension switch" means dump the air bags. I suppose I should perform that test with the truck parked and the engine idling; correct? -
expedite_it Thanks this.
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