How many air tanks are on a semi?
Tank capacity is for the truck only, trailers must carry all the air they require. As stated you need minimum three tanks, wet tank, primary and secondary and between the three must have enough cubic capacity to operate your brakes a minimum number of times.
What is the function of secondary air?
Secondary-air system components Secondary-air valves are fitted between the secondary-air pump and the exhaust manifold. Use is made of different versions. The secondary-air non-return valve stops exhaust gas, condensate or pressure peaks in the exhaust system (e.g. misfiring) causing damage to the secondary-air pump.
Why do I have two air tanks in my truck?
My truck has two air tanks a primary and secondary. I have separate gauges for each and they do not always have the same pressure in each. One would think the air pressure would equalize between the two and they would be the same. Is one isolated by a check valve or something?
How are primary and secondary air tanks separated?
Yes, the two system are totally separated by check valves. It is a slip system so if you have a massive leak in one system, you still have pressure in the other for your brakes. Primary is normally only your rear brakes and secondary is usually your front brakes and all your accessories. Usually axillary stuff is plumed from the secondary system.
What to do if there is no air pressure in secondary tank?
If it aint and you cannot fill like Dave said at the tanks your dryer will be the problem. You COULD think about isolating the dryer and splicing straight through but by OKC you are going to be either heaven, Hell or Freightliner FOR SURE.
Is there a secondary air problem in my truck?
Also I hear pretty good and don’t hear any other leaks when truck is parked. When driving the truck Primary air stays right at 125 doesn’t move unless braking then builds right back up and stays right on money.