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Old 11-08-2010, 11:35 AM
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Power Brakes on 32 Ford

I am in the process of building a 32 ford coupe and am ready to start setting up for brakes. I am using disc front and rear and was wandering if I really need power brakes. Just trying to keep things simple but also don't want to have a car that is a pain to drive. The car is a all glass car with small block engine with 11 inch front and 11.75 rear brakes. Any advice will be a great help.

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Old 11-08-2010, 10:51 PM
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As a Moderator here ... I would like to WELCOME you to Hotrodders.com

As a 32 Ford owner ... I would say YES to the booster. I have a power brake booster on BOTH of my 32 Fords. Complete pedal assemblies are available ... from most of the frame manufacturers if you choose to buy.

Here is a photo of mine under my 32 3W coupe.



You can go here ... to see a project journal on the build of my 32 3W coupe.

http://www.hotrodders.com/forum/jour...ge=1&reverse=1
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Old 11-09-2010, 06:39 AM
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I initially had power disc brakes on my 34 when I was building it. Wilwood calipers front and rear with a 69 Corvette master and 7" booster. All was well until I had to install the exhaust. Due to the design of my frame (Roadster Shop) I could not run the exhaust through the "X" member without it hitting the 7" booster. I did not want to run the exhaust under the fame because of ground clearance issues. I struggled with the aspect of removing the booster and replacing the master cylinder with a non power unit. I had input from several people who had built similar cars and they assure me it would be fine with manual brakes, and it is . Yes it requires more pedal pressure than power, but the stopping power is the same. You must engineer the system for manual brakes. The actuation rod on your brake pedal must be positioned properly to obtain the correct pedal ratio. Bottom line: If you have room for the power booster keep it, if not removing it will not be a problem.

FWIW, 67-69 427 cid Corvette's were available with 4 wheel manual disc's.

Vince
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Old 11-09-2010, 07:27 AM
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You do not need power assist for the disc brake application.

Using the correct pedal ratio and the correct master cylinder bore diameter will make the non power brakes work excellent.

For non power assisted brakes, you should be using a minimum of 6:1 pedal ratio. 7:1 is better. The bore should be no less than 7/8" and no more than 1". This is so that you get adequate pressure to the calipers for the brakes to work properly. The stroke volume must be sufficient to operate the calipers for full travel.

If you decide to run one of the aftermarket power brake boosters, you should be aware that the 7" diaphragm unit is much too small to be of any assistance and should not be considered. The better choice is the dual diaphragm 8" unit. The master cylinder bore for these small power brake boosters usually needs to be about 1 1/8" diameter. The pedal ratio need to be in the 4:1 range to keep a high pedal with this setup. Most of the aftermarket pedal assembly's come with a 6:1 pedal ratio designed for non power assisted brakes.

Another item to consider is what brand of rear calipers you will use. I used the GM calipers with the built in parking brake. These calipers have about .050 piston travel and will need to have a 10 psi residual valve in the rear brake lines in order to work. The parking brake must also be adjusted well BEFORE bleeding the system to decrease the total travel of the piston. The parking brake MUST be used as this is the designed method to keep these calipers adjusted. The GM calipers used in the front have about .015 piston travel and will require a 2 psi residual valve in the front brake line.

From my personal experience I would not recommend or use the GM rear calipers with the built in parking brake. They are difficult to set up and keep adjusted.
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Old 11-09-2010, 09:12 AM
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Quote:
Originally Posted by 302 Z28
FWIW, 67-69 427 cid Corvette's were available with 4 wheel manual disc's.

Vince

66-69 427 fyi
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Old 11-09-2010, 09:22 AM
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It sounds like the brakes you will be using are the Wilwoods front and rear. No you do not need the power assist for them, tho it does help a small amount with pedal effort. I do have a power assist assembly in my '31 and seriously considered removing that assembly, again, like Vince (302 Z28) above did. Instead, I chose to make up my exhaust with a dip and went under the MC and diaphragm. This is how you can run your exhaust if you really don't want it visible:

One side dips to clear the MC, the other, the starter
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Old 11-09-2010, 09:32 AM
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Power Brakes on 32 Ford

Thanks guys for all the good info. One thing I did not think about was my exhaust. I want to keep my exhaust above the bottom of the frame so manual brakes may be the way I need to go. I see Speedway Motors has a manual kit with a Corvette master cyl that is used on disc to disc systems.
Has anyone used their products. Again, thanks to all for the help.
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Old 11-09-2010, 04:04 PM
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Quote:
Originally Posted by pepi
66-69 427 fyi
Thanks for clarification Pepi.

Vince
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Old 11-11-2010, 09:54 AM
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Quote:
Originally Posted by pepi
66-69 427 fyi

I've never seen a 66 Vette with a dual master cylinder and no power assist. That is a new one on me. The dual master cylinder is the J50 option and as far as I know it was always power assisted.
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Old 11-11-2010, 05:28 PM
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65 and 66 Corvette power brake cars had dual master cylinders, a unique master that brings big money now. Non power were single circut. 67 and after both power and non power, had dual mastercylinders.
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