When I do a pre-trip on the air breaks, I lose a good amount of air with the service break depressed. Not so much if I lightly apply pressure.
Mentioned to mechanic and boss to no avail. Not too worried, though maybe I should be? I'm driving a 6 wheel dump, manual transmission and feel safe.
Air break issue
Discussion in 'Questions From New Drivers' started by sailfish27, Apr 8, 2021.
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Hold down the brakes ( don’t take a break ) maximum pressure, after the gauges stabilize. Time it for two minutes. If you drop more than six pounds in your tanks then you’re out of service.
86scotty, AModelCat, Dennixx and 1 other person Thank this. -
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4 PSI on a straight truck I believe. 2 PSI for each additional trailer.
uncleal13 Thanks this. -
If its just an initial pressure drop then it stabilizes, completely normal.
Look at the size of all 6 brake chambers and then look at the size of your primary and secondary reservoirs. A full brake application will easily drop the reservoir pressure 10 or 15 PSI. -
sailfish, i noticed you using the word break alot . Did something break? If a it was a weld, i would just break out my welder and run a bead. Call it day
Milr72 Thanks this. -
JolliRoger, 201 and Deere hunter Thank this.
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Last edited: Apr 8, 2021
JolliRoger and Deere hunter Thank this. -
Got my cdl class b less than a month ago. In school the truck I trained on would hold steady after the initial loss of air. Taught initial drop had to be between 5-15 psi and then no more than 3 psi in one minute.
The truck I am driving will continuously lose air after the initial loss. Probably more than 10 psi in 30 seconds. In a minute it would probably lose between 20-30 psi. -
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