Which Master for Vac Brakes? (Pic)

[HighMileage]

I’ve had my GN for about 15 yrs. It was vac brake swapped with all new parts before I got it. Now the master is leaking from the rear seal.

Which master cylinder does this look like? Is it one from an 87 Monte? Thx.

 

[wdxwrx]

I believe any G-Body master will work. Other than the Power Master, the rest of the TR brake system is identical to the vacuum system.

 

[1986 Buick GX1]

I believe the factory ones were aluminum, although Napa has the cast iron HD vacuum master cylinder available.
The cast iron ones may be from earlier years, I’m not sure.
Mine is from an ‘86 Monte SS with a dual diaphragm brake booster.
As with anything, if you take a little time you can make it look pretty.