Are the air compressors on semi trucks driven by a PTO (power take-off) or are they electric and run off the alternator and battery? - Quora
![Amazon.com: Vixen Horns Heavy Duty Onboard Air Compressor 150 PSI. Universal Replacement for Truck/Car Train Horn/Suspension/Ride/Bag kit/System. Fits All 12v Vehicles Like Semi/Pickup Trucks VXC8801 : Automotive Amazon.com: Vixen Horns Heavy Duty Onboard Air Compressor 150 PSI. Universal Replacement for Truck/Car Train Horn/Suspension/Ride/Bag kit/System. Fits All 12v Vehicles Like Semi/Pickup Trucks VXC8801 : Automotive](https://m.media-amazon.com/images/I/71zkzaBu-QL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Vixen Horns Heavy Duty Onboard Air Compressor 150 PSI. Universal Replacement for Truck/Car Train Horn/Suspension/Ride/Bag kit/System. Fits All 12v Vehicles Like Semi/Pickup Trucks VXC8801 : Automotive
![My air brakes pump up to 135 psi but when I release park brakes and supply air to trailer the psi drops to 100psi and My air brakes pump up to 135 psi but when I release park brakes and supply air to trailer the psi drops to 100psi and](https://ww2.justanswer.com/uploads/TR/TravisWells77/2014-03-12_064331_brakes_comp_unloader.gif)
My air brakes pump up to 135 psi but when I release park brakes and supply air to trailer the psi drops to 100psi and
![Amazon.com: Vixen Air Suspension Kit for Truck/Car Bag/Air Ride/Spring. On Board System- 150psi Compressor, 2 Gallon Tank. For Boat Lift,Towing,Lowering,Leveling Bags,Onboard Train Horn,Semi/SUV VXO8560 : Automotive Amazon.com: Vixen Air Suspension Kit for Truck/Car Bag/Air Ride/Spring. On Board System- 150psi Compressor, 2 Gallon Tank. For Boat Lift,Towing,Lowering,Leveling Bags,Onboard Train Horn,Semi/SUV VXO8560 : Automotive](https://m.media-amazon.com/images/I/611rny-g+lL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Vixen Air Suspension Kit for Truck/Car Bag/Air Ride/Spring. On Board System- 150psi Compressor, 2 Gallon Tank. For Boat Lift,Towing,Lowering,Leveling Bags,Onboard Train Horn,Semi/SUV VXO8560 : Automotive
![2002 Caterpillar 3126 Air Compressor for a Sterling ACTERRA For Sale | Wheat Ridge, CO | 38363 | MyLittleSalesman.com 2002 Caterpillar 3126 Air Compressor for a Sterling ACTERRA For Sale | Wheat Ridge, CO | 38363 | MyLittleSalesman.com](https://d2uhsaoc6ysewq.cloudfront.net/31370/Engine-Air-Compressors-Sterling-Acterra-23675305.jpg)
2002 Caterpillar 3126 Air Compressor for a Sterling ACTERRA For Sale | Wheat Ridge, CO | 38363 | MyLittleSalesman.com
![MAXair 18G55TRKE-H-MAP 18-HP 55-Gallon Truck Mount Air Compressor w/ Electric Start Briggs & Stratton Engine MAXair 18G55TRKE-H-MAP 18-HP 55-Gallon Truck Mount Air Compressor w/ Electric Start Briggs & Stratton Engine](https://www.aircompressorsdirect.com/products-image/600/18g55trke-h-map_13525_1000_8027983cf9c938cb4bd4ed92af723f44.png)
MAXair 18G55TRKE-H-MAP 18-HP 55-Gallon Truck Mount Air Compressor w/ Electric Start Briggs & Stratton Engine
![Cummins ISX Air Compressor for a 2015 International PROSTAR For Sale | Hudson, CO | 264230 | MyLittleSalesman.com Cummins ISX Air Compressor for a 2015 International PROSTAR For Sale | Hudson, CO | 264230 | MyLittleSalesman.com](https://d2uhsaoc6ysewq.cloudfront.net/46495/Engine-Air-Compressors-Cummins-ISX-27635846.jpg)