03-20-2014, 09:12 AM
Here is an excerpt from the Indiana CDL booklet on air brakes. It might be helpful:
Procedure to check air brake system-
Begin with air pressure at or below 90 psi.
1. Let air pressure build and check that the governor cuts out between 100-140 psi.
2. Turn the engine off, turn the key to the "on" position so gauges work and release all brake valves. Fully apply the foot brake to see if the air pressure drops no more than three pounds in one minute.
3. Fan off the air pressure by pumping the foot brake to see if the low air pressure alarm activates at approximately 60 psi.
4. Continue to fan off the air pressure. At approximately 20-45 psi the spring brake push-pull valve should pop out.
If you would like to learn more stop by your BMV office and pick up a CDL manual. (they are free in Indiana) Even though a CDL is not required for RV's there is a lot of useful information in the manual.
In order to prevent possible brake damage do NOT depress brake pedal while the Parking brake valve is activated. (Pulled out)
Procedure to check air brake system-
Begin with air pressure at or below 90 psi.
1. Let air pressure build and check that the governor cuts out between 100-140 psi.
2. Turn the engine off, turn the key to the "on" position so gauges work and release all brake valves. Fully apply the foot brake to see if the air pressure drops no more than three pounds in one minute.
3. Fan off the air pressure by pumping the foot brake to see if the low air pressure alarm activates at approximately 60 psi.
4. Continue to fan off the air pressure. At approximately 20-45 psi the spring brake push-pull valve should pop out.
If you would like to learn more stop by your BMV office and pick up a CDL manual. (they are free in Indiana) Even though a CDL is not required for RV's there is a lot of useful information in the manual.
In order to prevent possible brake damage do NOT depress brake pedal while the Parking brake valve is activated. (Pulled out)
1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.