hi guys so 02 freightliner century so my brake valves red/yellow sometimes start to leak air inside and I have to wiggle alot for them to stop now when I press the brakes loud hissing noise comes from trailer connect back there when I break hard it doesnt do it I am not losing air I've pushed both valves in turn off truck dont hear leaks about month ago I had replaced a big valve in back and that had fix another problem that I had but anyway if I pop out trailer valve while leaving tractor push in dont heard the sound it I pop out tractor valve and leave trailer pushed in it will make that loud hissing sound I changed the little rubbers on the trailer connect outside and nothing any suggestions
any suggestions (brake valve air leak)
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by thecubantrucker, Nov 12, 2019.
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Get it replace, this is a serious issue that needs to be replaced.
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You bneed to get someone to help you and find where the air is leaking to start with.
Why are you pushing the brake pedal when the tractor valve is out to start with? -
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Again, why are you applying the brake pedal with the tractor valve out (truck brakes are set)?
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truckdriver31 Thanks this.
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Probably, I do not think it should leak while you are applying pressure, but don't really know. You should not be applying brake pressure from the pedal while the brakes are set though, it can't do anything anyway, and for all I know the air may have to go somewhere, I don't remember ever trying it.
truckdriver31 Thanks this. -
Sounds like Trailers got a leak somewhere, feeding back through parking valve. That’s normal when Trailers leaking. Chock tires and shut Truck off, Brakes released, listen/ look for leak on trailer,then apply trailer hand brake, check again. Park brake valve, leaking, and stopping when wiggled, usually means it’s going bad, that’s a separate issue, replace it ASAP, it will soon leak non stop. Possibly shutting you down.
JonJon78 and truckdriver31 Thank this. -
Rideandrepair Thanks this.
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