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Rear Disc Brake Conversion Kit - 1977 Transam

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1977 Transam:
Forgot to ask, "What size drums would be on mine at the moment"? 

Not sure if anyone knows.

Thanks.

Tommy

1977 Transam:
Found this article comparing drum vs disc brakes which I found interesting.

http://www.edmunds.com/car-technology/brakes-drum-vs-disc.html

Tommy

bonnevista:

--- Quote from: 1977 Transam on March 05, 2015, 07:49:37 AM ---Forgot to ask, "What size drums would be on mine at the moment"? 

Not sure if anyone knows.

Thanks.

Tommy

--- End quote ---

I think they're 9 inch from memory.

LeighP:
Yep, B body drums are 11" vs the stock 9" diameter.

Most of the braking on a 2nd gen is accomplished by the discs on the front. The large drums are effective and unless you're using them for track work, I can't see heat build up being an issue.
Whatever you do, be prepared for the possibility of needing an adjustable bias valve.
Be sure to double check the seated depth of the booster's operating rod vs the piston in your mastercylinder.....problems with this surfaced on my car and others when combining repro mastercylinders and repro boosters.
You won't need to change the factory booster/master combo if you're only switching to 11" drums. You will need to replace the mastercylinder if you're switching to disc/disc, and in some situations, you may need to change the booster as well (factory disc/disc WS6 booster isn't the same as the earlier disc/drum booster from memory).

bonnevista:
And in my series of car (maybe others), full size station wagons had 12 inch drums on the rear.

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