Air break issue

Hold down the brakes ( don’t take a break ) maximum pressure, after the gauges stabilize. Time it for two minutes. If you drop more than six pounds in your tanks then you’re out of service.

 

Even less for a straight job I believe.

 

4 PSI on a straight truck I believe. 2 PSI for each additional trailer.

 

If its just an initial pressure drop then it stabilizes, completely normal.

Look at the size of all 6 brake chambers and then look at the size of your primary and secondary reservoirs. A full brake application will easily drop the reservoir pressure 10 or 15 PSI.

 

sailfish, i noticed you using the word break alot . Did something break? If a it was a weld, i would just break out my welder and run a bead. Call it day

 

This may sound like a stupid question, but it's a common mistake when testing brakes. Are you pushing the brake completely or just applying pressure, and are you maintaining full pressure throughout the test? I've seen guys who flex their ankle/foot a little throughout the process, and that minor change will keep altering brake pressure thus draining the air more.