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Username Post: Can a power booster leak off all vacuum?
55MAS 
Senior Member
Posts: 1505

Loc: North Coast, Ohio
Reg: 12-19-01
12-21-18 06:32 AM - Post#2755186    
    In response to Rick_L

  • Rick_L Said:
It sure can, but the check valve would have to be blown too, unless the vacuum leak symptoms were noticeable only when the brake pedal was applied.



The vacuum booster itself can can also have an internal leak at the diaphragm. Sometimes one can detect ans audible "hissing" under the dash where the plunger rod passes

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