1988 Mercury Colony Park - 302 engine/AOD transmission -

Found a vacuum leak right above my brake pedal, I have no idea what these hoses go to and what they do (although I assume its associated with the brake booster.)

The hissing fluctuates a little whenever I shift to Drive or overdrive, the hissing then dissipates whenever I step on the gas and builds back up when throttle is released.

I removed the black vacuum line as pointed out in the pic, the then stops. I'm guessing there is a crack in the white half ring the lines hook up to. Also im not sure if there is a third line im not seeing that could be unhooked.

Does anyone know what the cause is, and where I could get a replacement piece? enter image description here

enter image description here

  • What's the number on the part? The arrow obscures it.
    – Ben
    Commented Jul 26, 2017 at 23:41

1 Answer 1


I had an '86 Town Car (same platform) back in the day. IIRC, the white half ring is the automatic parking brake release. When mine leaked, I removed the vacuum line and plugged it. That took care of the leak, but I didn't have the automatic release feature anymore. You would want to source a replacement part in order to regain full functionality.

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