How do you test for air leakage rate?
- Test air leakage rate. With a fully-charged engine (125psi), turn off the engine, release the service brake, and time the psi drop. It should be <2psi in 1 minute for singles, <3psi in combos. Then apply 90psi more w/t/brake pedal. After that if it falls >3psi in 1 minute for singles or >4psi in combos the air loss rate is too much.