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Why Do I Need A Check Valve In My Air Actuated Brake Control

CenTex
Explorer
Explorer
I have a Ford air brake truck that I am wanting to pull my fiver with. I bought a Heyes air actuated brake controller to install on the truck. It says to put a check valve in the air line. I have a second air brake truck that I have had for some years that I installed an air brake actuated controller identical to the one I recently bought. I installed that controller about ten years ago and it had no mention if a check valve. It has always worked flawlessly and I have had no problems. Why now does it ask me to install a check valve? What is the function of the check valve unless you blow a line off the brake controller? The truck has a dual air brake system and spring brakes should I have a catastrophic failure.
WITH AGE COMES WISDOM, AS WELL AS LOTS OF ACHES AND PAIN.
2 REPLIES 2

BarneyS
Explorer III
Explorer III
Moved to Tech Issues forum from 5th wheels.
2004 Sunnybrook Titan 30FKS TT
Hensley "Arrow" 1400# hitch (Sold)
Not towing now.
Former tow vehicles were 2016 Ram 2500 CTD, 2002 Ford F250, 7.3 PSD, 1997 Ram 2500 5.9 gas engine

avvidclif1
Explorer
Explorer
Over the last 10 years they lawyered up. Any more questions?
Clif & Millie
2009 Ford F350 SRW CC Lariat 6.4 Diesel
2015 Heartland Cyclone HD CY3418 Toy Hauler