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Old 04-09-2012, 12:24 AM
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You will end up buying two master cylinders if you get a bore size under one inch.

There is nothing 'power' or 'manual' about any master cylinder. They simply operate the opposite of your wheel cylinders. Some M/C's included a residual valve but most didn't.

The idea of one reservoir being larger than the other is because calipers use far more volume than wheel cylinders. So, the large reservoir gets plumbed to the front brakes. If both reservoirs are the same size (usually both large), plumbing to front or rear just doesn't matter.

I support Howard Prout's post, but I believe the M/C bore he is using is 1". Howard has been down this road with both manual drum and power disk brakes. He has a Squarebird with 430 and A/C, which is the worst combination for brake retrofit because of tight real estate at the firewall. Howard is a skilled engineer who fabricated his system and he is using MBM/Scarebird products for a very successful Power Disk Brake setup that he has run for two years. Listen to his advice.

This 'brake system' business is much more technical than it appears. When all your brake cylinders were plumbed together, it didn't matter if one or more are out of adjustment. When you split the system using a dual reservoir, now it matters.

For example, what happens when the front shoes are engaging but the rears aren't quite there yet? Hydraulic fluid will not compress, so you will lock up the front wheels and the rear brakes will be useless.

Enter the Combination Proportioning Valve. They make them for DISK/DISK and DISK/DRUM. I won't go into them here but you need one. It sounds great to just buy a dual res M/C, but you better know what you need to make the brake system work properly and safely. You have seen first hand, what happens to an OEM system when a line bursts. It's no joke when you're going 40 MPH. - Dave
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