Answer to our questions...
FIREMECH1, I went and asked some friends on another forum and here is the response I got:
NFPA 1911, 2007 edition.
16.4.1 The parking brake system shall be tested at least annually.
16.4.2 The parking brake system shall hold the fully loaded fire apparatus on a grade of 20 percent or the steepest grade in the fire department's jurisdiction if a grade of 20 percent is not available.
16.4.3 The parking brake shall be tested with the apparatus facing uphill and again facing downhill on the same grade.
In my area, I have a grocery store parking lot with a side entrance that is very steep. I do not know if it is 20 percent grade, but it is the steepest grade around here. I use it to test the trucks in the nearby districts.
The link below lets you convert an angle reading to percent grade so you can document the grade in the terminology the spec is written in. As you can see in the chart 20 % grade is app. 11 1/2 degree slope.
ASE Master Auto, Med/Hvy Truck, Truck Equipment
EVT Master Apparatus
EVT Master Ambulance
City Of Yuma, AZ
Just had to go to the right people and ask politely for their help.