air output of brake system

It is not very high, you can use some tools for a short period, but the biggest issue is the tanks are too small and don't store enough air.

 

I have never been able to get a meaningful CFM rating from any compressor manufacturer, they all rate them free flowing (which makes them sound huge), I estimate average is only about 2 CFM at 90 PSI. It's not very much, but you can run most air tools in short bursts. Air tools usually will require 90 PSI, so the size of the tanks depends on how long you can use them before you have to wait for air to build back up. I have run a 1" tire gun out on the road when the service truck air compressor died. I only got 2- lugs off before I had to wait, but it worked. Going back on, I did all 10 quick and finished off with a torque wrench, which is common practice for me anyway.

If you looking to have some air tools for easier roadside repairs or airing up tires, I wouldn't worry too much about it, it'll get the job done. If you're looking to do major work at home, invest in a decent air compressor.

 

Honestly I wouldn't waste time with trying to run an air polisher from the truck air system. Like was posted above, it could work just fine for a 1/2" or 3/4" impact wrench if you hit 1 or 2 nuts before letting air build back up. I would look into a Twister. They are a little pricey but if you buy the fancy one it has a compressor, 110V/220V generator and welder package all in one. Only weighs about 250lbs with the remote radiator or you could plumb it into the truck's rad. Tier 4 compliant and could probably work decent as an APU.

 

Don't use the truck air. Waist of time.

Just get a honda generator and a good electric polisher done .