You pump the pedal three times and hold it down for five seconds, making sure that the pedal does not move. What are you inspecting?

Test for Hydraulic Leaks. If the vehicle has hydraulic brakes, pump the brake pedal three times. Then apply firm pressure to the pedal and hold for five seconds. The pedal should not move. If it does, there may be a leak or other problem. Get it fixed before driving. If the vehicle has air brakes, do the checks described in Sections 5 and 6 of this manual.
[CDL DRIVER MANUAL FINAL]