What plating for master cylinder lid on 79 TA/SE with 4wheel disc & W72
 

What type of plating should be on the master cylinder lid for a 1979 Trans Am SE with 4 wheel disc and the W72 400 Pontiac engine?

It should match the brake booster....yellow/gold zinc......

Thanks for replying! I will need to include it with the power brake booster when getting it plated.

I've seen a couple of 4 wheel disc 79's, they had the plastic reservoir/aluminum type master cylinders. All the front disc. rear drums were iron w/ steel lids...

I don't know everything, though... :)

THe aluminum master with plastic reservoir was 1981 deal.........WS6 for sure,anyways..

i do know you can but new boosters with the correct stamping in the platted and non platted version
and if i'm not mistaken the MC was cast iron, at least from all the various photos of low mileage cars i have seen, but who knows.... perhaps a few didn't get them

some things on the 79's may be different (power steering lines, etc as they started transitioning to metric)

Also, the master cylinder was painted black

Hmmmmm.....I have never seen that before.

Google 79 trans am engine and click on images and you will see original
engine compartments with black painted master cylinders. I have owned two 79 WS6
T/A's and both came with black painted master cylinders. Both were California built cars.

Agreed...I've owned several 79 WS6 cars, including my current low mile original, and all were black MC with zinc cover and booster.

Wow.....I see that you are correct. I found some low mileage originals on the web and they did indeed have black master cylinders.

Would that be a semi gloss black for the mastercylinder?

You guys are correct! The booster is still zinc plated is that right?

Semi-gloss on the master and yellow zinc on he booster........

Awesome and thanks!

I was going to have the proportioning valve bracket done in yellow zinc also as it looks like it was that way.

Off the top of my head.....the prop valve bracket was natural or silver zinc...and usually one of the first things to start rusting under the hood.......commonly painted black to blend in....

One more thing, if you want to be totally correct, these cars had a paper
tag about 3/4 inch square with a two letter code on it applied to the middle of the brake
booster above the master cylinder. I reproduced my tag in vinyl when I restored my car
so it wouldn't deteriorate. I get Fast Signs to make duplicates of all the paper tags on my
cars when I restore them for the springs, brake lines etc. The tag on the booster is white
with black letters. I can't remember for sure what the letters were.....NH I think. Maybe
someone else on the forum knows what the letters are. I would have to look tonite when
I get home.