What is the recommended method for inspecting a commercial vehicle's pneumatic brake system for air leaks during daily pre-trip inspections (statički i dinamički test curenja zraka)?

1. Build full pressure to cut-out (~8.5 bar), shut off engine, release parking brake, press footbrake pedal firmly for 1 minute: pressure drop must not exceed 0.4 bar on combinations (0.2 bar on solo trucks)
2. Listen for air hissing with the radio volume at maximum
3. Drive at 80 km/h and see if the brakes work
4. Air leakage testing is not required on vehicles under 10 years old