I stumbled upon this effect accidentally at a young age by putting any junkyard MC that would fit and work on different cars.Well this is giving me some good ideas. I like the option of changing bore size especially now that I will be doing a dual cylinder install. Just trying to think about bore size and it might be smaller is the trick. My thoughts are that the same force is applied to the piston regardless of size therefore if you have a larger piston it creates more psi and a smaller piston should be less. Need to think about this to make sure. Anyways I will try this option and see what happens.
I agree but, what would achieve the desired effect? Bigger would put out more volume and with the booster doing the work it might be more touchy. Like I said it’s tricky sometimes. Not saying you’re not right but, I wouldn’t count on it.Smaller would give more travel, but it will increase pressure.
High school physics with a touch of night school hydraulics course...
I would think so. The booster is the wild card here. It might have enough power overcome whatever work you can give it.With a larger bore and the same pedal travel you would move around more brake fluid right? Would that not increase touchyness?
Getting everything to work properly is not the issue it comes with years (actually decades)of experience being a mechanic. I like the idea of changing master cylinders and will do so but it raises other questions. I have been out of touch the last couple of years due to medical issues and just need to get my brain back into working condition.Please don't even think about this any further. Each piece was designed to work perfectly in the overall design. Try changing the master cylinder. You have conquered the near impossible, getting all four to lock up at the same time.
No problems with the shoes they are like new. Adjustment is perfect and pedal stroke is good as well. It’s just the way the system was designed.I have to agree - we're all overthinking it.
Checking the shoes (drums) for contamination is a quick first.
Upgrade to dual circuit master as you noted you are planning is a good 2nd step.
Good information. This creates the same effect as changing the master cylinder. My thoughts are to do the MC upgrade and see what happens. I can then look into these cylinders if I am still having issues.Here's your answer, as per Sir Richard Ehrenberg, SAE, Mopar Action, etc. Note that this is for the wheel cylinders, which means that a larger master diameter would make for a similar hydraulic situation. I used these reduced-diameter wheel cylinders when I rebuilt my rears, but I'd be leery of experimenting with cylinder sizes otherwise. [ [I know this is for a disc/drum car, not powered drums as per this thread, but you get the idea.]]
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