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Old 05-26-2005, 09:59 AM
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Chevy master cylinder power or manual

I'm doing a brake conversion, I have a single reservoir non power cylinder and want to put in a dual reservior, I don't have room to convert to power assist but how much difference is there between the power and manual cylinder as to if they interchangeable. Thanks, Eric

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Old 05-26-2005, 11:50 AM
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Power brakes mostly make it easier to use. I am sure there are some-folks that will disagree but Thats my take. You didn't say if you are keeping your drum brakes or upgrading to disk. I will assume you are keeping your drum brakes. You must use a drum brake master cylinder. Also it must be big enough to handle your brake requirements. It would be hard to becomend a master cylinder without more info.
You will need to split your current brake line setup in to 2 circuits front and rear.

HTH
Richard
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Old 05-26-2005, 12:40 PM
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As noted previous, there are differences between manual and power master cylinders. Contrary to popular belief, power brakes DOES NOT improve your braking.

Vince
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Old 05-26-2005, 02:37 PM
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I needed to add a little more info currently I have drums all around and I'm installing disc's in the front, I didn't know if there were physically a difference between the master cylinders,bore size or any other factors,given the space I'm working with the corvette 67 and up looks pretty good I just wasn't sure if power vs non power cylinder would make a difference I know I'll need a prop.valve but I'm still scrounging parts up. Thanks for any help. Eric
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Old 05-26-2005, 03:00 PM
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Use a Disc brake master cylinder then. I dont know that you will need a prop valve. Your brake system will be more disc's than rear drums. I would guess 70% maybe 80% front to rear. once you get it figured out what you will be using for brakes I'll bet the the big brake places would have some ideas what to use. At least from what they sell.

richard.

I would have bet the 67 Vette should have had discs as a option. I thought the 67 camaro did. I would think using brakes from a vette would be easiest, but it might be expensive to find factory stuff now that everyone want's to make big bucks just cause it a vette part.

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Old 05-26-2005, 04:48 PM
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Power vs. non= less pedal input. If you have weak legs or are lazy, power brakes are a good thing. If you use them to cover up another deficiency in braking... not so good.

Disc/drum master cylinders:
Power vs. non
Some use same, some different.

It is a function of pedal ratio (pushrod fulcrum), pushrod length, booster capacity, and some other factors.

If your pedal ratio is less than 6:1, you normally step down ~1/16-1/8" in bore size from the power brakes, which often has ~ a 3.5:1 ratio+booster.

Master size can also vary depending on individual taste... at least in rodding... A large bore will give little pedal travel, but will be harder to push. A smaller bore will have more pedal travel, but the effort is not as high.
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Old 05-26-2005, 05:27 PM
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Thanks for the info, as I said just gatering parts so I have as much as possible before I start and was looking for info and suggestions. Thanks
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Old 05-26-2005, 05:43 PM
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Raybestos makes a new master cylinder for the 69 Corvette. Look for one for the following specs. Do not, I repeat, do not be tempted to go rebuilt on the master cylinder. The price differential is not worth it. You can order one online from Advance Auto Parts, it's about $70.

69 Corvette
427cid 435hp
4 wheel manual discs

I have one on my 34 Coupe.

Vince
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