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You will apply firm pressure for one minute to the service brake The final step is to “sniff out” the leak with the nanoleak sniffing device. After one minute, give the result.

How to Perform a Leak Down Test

Press brake pedal down firmly, time 1 minute, cannot drop more than 4psi repeatedly press the brake pedal, air pressure will drop, warning light comes on at 60psi T brake valve delivery pressure