The serial number on my 87 HO coupe is 89. It was built in South Bend. Yours is 86.

 It was 3 cars ahead on mine on the production line. It stands to reason that it 
has the same master cylinder.

This is what I learned when I replaced my master cylinder.

The replacement master cylinder comes from a 1967 Ford Fairlane with power disk 
brakes and a 6.4 liter (390 ci) engine.

Autozone carries one replacement.

M1642 reman $40.99.

NAPA carries three variations on the theme.

TS101379 reman $29.99.

UP 36248 new $89.99.

UP495 rebuild kit $26.49.

I chose the Autozone reman. It has a stainless sleeve in the barrel. The NAPA reman 
is bored but not sleeved. The new NAPA cylinder specified a different size for the 
rear brake line fittings. I wasn't about to rebuild the cylinder that failed.

The Autozone reman has the same casting number as the original in my car. The
 fittings on my lines were a straight fit. The cylinder came with a set of plastic 
fittings and hoses that made the bench bleed so complete that I didn't have to 
bleed the brakes.

The new cylinder showed me how good my brakes were on the test stops.

PCKing
87 HO Coupe