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1. 

   brake problem

   From SOR.com- 7/70 - 9/75 When pressing on the brake pedal a hissing sound, a rapid change in idle or a rough idle are signs of a brake booster malfunction. Bad boosters will burn the exhaust valves in #5 & #6 cylinders. To Check Your Booster: Engine Off - press the brake pedal several times...

   • Words: 220
   • CruisinGA
   • Post #6
   • May 2, 2003
   • Forum: 40- / 55-Series Tech
2. 

   brake problem

   Booster. That air hiss is means any combo of 3 things-Vacuum leak at engine block, bad/loose tube to booster, bad booster. I thought I had a bad booster but when I replaced my intake/exhaust manifold gasket my booster quit hissing. Without the booster functioning properly you essentially have...

   • Words: 120
   • CruisinGA
   • Post #4
   • May 2, 2003
   • Forum: 40- / 55-Series Tech