coronet68mx
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Rear disc brakes
- Thread starter andyf
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What does BEER have to do with it ?
Charger Dana
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Mentor: “^^^this seems counter intuitive...i would say if you need more pressure, get a larger bore master cylinder”
Just think of a garden hose: turn it on and watch the volume AND pressure, whatever it is. Then put your thumb half way over the outlet (smaller bore). It increases the pressure. Volume stays the same.
I highly recommend reading all of Andyf’s books and his tips. I learned a lot from following him.
https://www.amazon.com/finkbeiner-andy/s?k=finkbeiner+andy
Just think of a garden hose: turn it on and watch the volume AND pressure, whatever it is. Then put your thumb half way over the outlet (smaller bore). It increases the pressure. Volume stays the same.
I highly recommend reading all of Andyf’s books and his tips. I learned a lot from following him.
https://www.amazon.com/finkbeiner-andy/s?k=finkbeiner+andy
Last edited:
andyf
Well-Known Member
My current master cylinder has a 1.125 bore size. I'm going to swap in a 15/16 bore master cylinder. That reduction in bore size will increase the brake line pressure by 44% for the same pedal force. I think the increase in brake line pressure will help the car stop but a 44% increase is pretty big so it will be interesting. If the change is too much I can swap in a 1 1/32 bore size which would split the difference. With the 1 1/32 bore size my pressure would increase 19% over what I have now. Just have to try it and see. Baer recommends using the 15/16 MC with four wheel manual disc brakes so I figured I'd start there.
On a related note I found out that Inline Tube makes a dual MC conversion kit for the early B body cars. The kit has a new distribution block and the two hard lines from the MC. I did the dual MC conversion on this car about 30 years ago and back then there weren't any kits or parts. Everything had to be hand built in those days. When I pull the car apart for the winter I think I'll install the new lines from Inline Tube and clean things up a bit. Nice to be able to buy new parts that are at least close to fitting. I've used reproduction stuff long enough to know that none of it actually fits, but sometimes it is close enough that it gets you into the ballpark.
On a related note I found out that Inline Tube makes a dual MC conversion kit for the early B body cars. The kit has a new distribution block and the two hard lines from the MC. I did the dual MC conversion on this car about 30 years ago and back then there weren't any kits or parts. Everything had to be hand built in those days. When I pull the car apart for the winter I think I'll install the new lines from Inline Tube and clean things up a bit. Nice to be able to buy new parts that are at least close to fitting. I've used reproduction stuff long enough to know that none of it actually fits, but sometimes it is close enough that it gets you into the ballpark.
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