1985 avanti Master Cylinder

[Brooks Barnes]

where does the connection on the bottom of the master cylinder go to? Brooks

[Zedman]

Hi Brooks.  If you have a Disc Drum system on your Avanti, you probably  (read, ought to !) have a proportioning valve on it.  I had a Kelsey Hayes valve on the inner Left hand Frame Rail down below the Mastre Cyl location. I have replaced it with a GM PV2 Combination valve which has the same port configuration of the old KH unit and even bolts up exaclly the same.  It is my belief that the FRONT MOST LOWER port of the Master Cyl will be for the Front Disc system. This line will go to the Combination valve as indicated in the screen shot posted here.  A shot of my Master cyl is also shown for your comparison.  If you need further clarification please do ask.