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Wheel cylinders

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v8mgbal

v8mgbal

Jedi Trainee
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Hello all, Hope someone can help me. I am going to change my brake wheel cylinders and see there are two sizes. A 3/4 for early 70s cars and the RB cars were smaller. is one better than the other, does the RB cylinder have better stopping power and that was the reason it is smaller. I guess I was wondering why they changed them for the RB cars, thanks.
 
Not sure why they changed, but there is a dowel pin on the cylinder that changes location between the different sizes, so if you accidentally get the wrong size (as I did), the dowel pin won't line up with the hole in the back plate. I would think that the smaller cylinder would have less stopping power since it would take more brake pressure to produce the same amount of force on the shoes. Pressure * area = force
 
Actually, the different locations for the dowel pin holes ties more to different backing plates than anything else....you can use the larger wheel cylinders if you redrill the hole location.
 
Yes that is what I was trying to figure out, it seems as the car got heavier the cyl got smaller. I think bugeyes were 7/8 then next came 3/4 and then the RB car was like .675 dia. I was thinking the smaller bore was giving more braking because the car was heavier. at least that would seem logical???.
 
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