Should be mounted below the master cylinder on the frame.
It looks like a block of metal with the lines from the
master cylinder going in and the lines to the wheels coming
out for a total of 5 lines IIRC. It incorporates the brake
failure warning switch, proportioning and metering
functions. They were not terribly reliable over the long
term. If yours is original, it likely needs
repair/replacement if that has not already been done. The
originals can be hard if not impossible to find. You may
have to adapt a Wilwood or some similar valve into the
system if you cannot find a suitable replacement. I suppose
it would also be possible to adapt a later master cylinder
that has the valves at the discharge ports and remove the
original from the system.
They were not terribly reliable over the long
About 15 years ago the "brake" light was on in my Cougar. I got a
replacement valve from the Ford dealer and he said that I was lucky
because this part has been discontinued and he had to get it from
somewhere on the other side of the country. Before I replaced it, I
smacked the old one fairly hard with a hammer and after that it worked.
I think I still have the new one out in the garage somewhere.....
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