Brake booster or vacuum leak ?

Lincoln Mark VIII

  1. Dougviii

    Dougviii Active LVC Member

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    I think the brake booster on my 130k 93 mark8 has failed but before I replace it I thought I would ask for advice, the brake pedal has gotten very hard, brakes still work just takes alot more muscle, I also noticed the a/c vents are acting up, not just under braking but can't find any vacuum leaks. Is this a common problem? Anything else I should check or do before I replace booster?
     
  2. joegr

    joegr Dedicated LVC Member

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    Sounds more like an overall vacuum leak to me, but it could be a really bad booster.
    If you unplug the vacuum line from the booster and cap it (the line), do the AC controls return to normal?
     
  3. germansheperd

    germansheperd Active LVC Member

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    Your AC vent issue could be a broken blend door actuator.
     

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