GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Primary Supply Reservoir Safety Valve Leakage Test
  1. Coat the safety valve exhaust vent with a soap solution.

    2. Object Number: 202784 Size: SH
  2. Check that the leakage is less than a 25 mm (1 in) bubble in 5 seconds.
  3. Clean or replace the valve (1) if leakage exceeds these specifications.