I'm not a new driver but I'm new to driving automatic trucks. I've driven both KWs and Peterbilts and they both lose transmission air when backing up and you have to wait for air to build up if you shift too many times. This is especially frustrating when backing in tight spaces where you have to reposition several times. Is there a trick to it? I've heard of not using the brakes too much etc....but it doesn't seem to help.
Automatic Truck loses transmission air
Discussion in 'Questions From New Drivers' started by Schöne, Feb 28, 2024.
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Might be easier backing in R1,if it's going into R2 when reversing.
Bean Jr. Thanks this. -
Freightliners have Hill Start Assist. When backing if you push brake pedal it will come on and hold truck then dump the air when you move. You could try turning it off if you have that button on dash. Just make sure you don’t roll. Flat parking lots you don’t need it and it seems to use more air
TurkeyCreekJackJohnson and tscottme Thank this. -
Welcome to the new way, which everybody knows is so much better than the old “manual” way.
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I have used both Freightliners and Internationals with auto and neither had that problem.
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I have a late model Kenworth with the 12-speed automatic transmission and this is an inherent problem from what I've been told. This transmission uses a lot of air to shift gears and that is just the way it is. Mine regularly runs out of air when I am backing up and sometimes when driving forward.
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Hatt91, Flat Earth Trucker and TurkeyCreekJackJohnson Thank this.
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