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 Jul 26 '17 at 23:41

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.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.