Another Question For The Race Car. Which Brake Master Cylinder Should I Use. The 2 Cup Older One Like My 79, Or The Single Cup Newer Stlye Found On The 82 Ish Cars. Again I Have Both Layin Around. I Am Going To Use The Better Calipers From The 82 Due To Larger Pad Area.

 

Are you trying to replicate the race car or ???

 

Im Trying To Get The Outside Part Correct, The Little Things Dont Matter To Me. Rolcage Design Etc.

 

If the actual caliper piston is a different size than the older versions than I would recommed using the later master cylinder as it will be better matched to the caliper. If it's all the same though then I think the later versions look cleaner than the ghetto looking old ones. I hate the way my 81's master cylinder looks

 

The Only Reason I Ask Is That The Early Ones Have 2 Seperate Systems For Front And Rear Where As They Later Has Only One, So If One System Fails The Dual Pot One Has Some Brakes Left. Yes No?

 

Well you're correct on having some brakes left, but that applies to both versions as both versions are practically identical. The only signifigant difference is that the two reservoirs in the later models are combined to LOOK like one reservoir. Look at it and you'll see that there are still two caps and two individual outlets into the master cyliner body itself. The early master cylinders simply had two physically and visually seperated reservoirs. So the later system will also still have "some brakes left"

So dont base your decision on that. Like I said, the later version is just prettier. I should point out that they do mount differently though. The early version has it's bolts lined up vertically and the later version has the bolts lined up horizontally. Also the lines enter the earlier version from below while the later version has the lines entering from the side. Also, I dont know if there is a difference in piston diameter between the two systems.

 

I Kinda Noticed The Small Diference With The Mounting, That Being Said I Would Have To Use The Correct Booster For The Master. And What Your Saying Is Bigger Piston The Better?

 

No, thats not what I meant. See on a car the size of the pistons in the brake calipers is sized in comparison to the size of the piston in the master cylinder. messing with this ratio will mess with pedal pressure and force which can result in a stiffer or softer pedal then is neccessary. Most people like a firm yet easy to depress pedal. Plus too stiff puts a lot of added stress on the booster. Now in the case of this car I doubt it's that big of an issue even if the piston sizes do differ, which they probably dont. The pedal isn't all that stiff to begin with so I wouldnt worry about it. But if you tried to putting a improperly matched caliper on your car without changing the master cylinder to match then you can run into problems. Most big brake kits on the market simply use more smaller pistons whose surface areas add up to the surface area of the original larger one or two pistons (depending on car) of the original caliper. Basically, the later model is a lot cleaner looking so I'd go with that one. That's the one I'm going with in my 81. My master cylinder is shot anyways and I'm having to buy an 82 master cylinder anyways, so I'll just transfer it and the booster over to the 81.