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Tcarrasco84

1955 Buick brake question

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[TD=class: alt1, bgcolor: #F2F2F2]Hello all, iam curious if anyone has ever put in a 60s style master cyl/booster firewall mounted in a 55 or 56 Buick. My Buick special is drum/drum and a original power brake car. The treadle vac was gone form the car and don't plan on going that route of putting one back in.I understand that the brake lines in the 55 special are 1 inch.so theoretically if I had a drum drum power booster that was 8 inches and the master cyl was set up for 1 inch I would think it would work I'm not looking to go complete resto on the car. Will something like this work? http://www.speedwaymotors.com/8-Inch...ster,9557.html

What have you used? Let's talk. Thanks everyone, and happy new year! Any advice is appreciated. Tony

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you need to rethink not putting a treadle vac back in. now if you wanted to put in a buick standard master cylinder set up in the car and install a hydrovac between the standard master cyl. and the four wheel cyls, that would work. your best choice needs to be find another treadle vac set up that's correct for your 55 buick, and restore your car's brake system as designed by, and offered by buick in 1955. charles coker, 1953 pontiac tech advisor.

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I thought I just read an answer to your post on the H.A.M.B. It is new years day, so it may take a while to get some answers.

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Yea I've asked there with no such luck. And would rather just go with a firewall booster.thanks

so you would rather degrade the value of your buick, by sticking with the idea of modifying your buick's brake system with something the car was not design to have, instead of finding the stock parts that are currently missing, and are not hard to find at all, and by staying with the correct parts, keeping your buick's market value at the level it deserves to be at ?, charles coker, 1953 pontiac tech advisor. p.s. there was, and is nothing wrong the original treadle vac system.

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Wow a little hostile, I never plan on having this car stock, and it doesn't really interest me. And as far as the value being lowered I could care less it's my car and never going to sell it.

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Charles,

While I totally agree with you, it is still his option to degrade his Buick.

I just hope that his modification does not become a safety hazard on the highway, both for his sake, as well as the guy or gal, or kid he needs to avoid.

GM knew what they were doing when the car was designed....

Different or new does not always mean better.

I concur that the Treadle-Vac is the best way to go. Mine works great on the '54 Caddy.

But again -- not everybody is wiling to accept the wisdom which comes with experience

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Wow a little hostile, I never plan on having this car stock, and it doesn't really interest me. And as far as the value being lowered I could care less it's my car and never going to sell it.

a little hostile ?, lol, no, that wasn't my intention. i'm glad to hear that you never will sell it, because that is what i made up my mind about my 1953 pontiac chieftain custom catalina in 1973, when i was 17, and paid $150.00 for the car with my own money. i still have the car today. keep us informed with your progress. pictures please. charles coker, 1953 pontiac tech advisor.

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Tcarrasco84,

Sorry you did not get the information you wanted to hear,

but many members on this FORUM prefer originality,

after all - that is one of the primary concerns of Antique Automobile Club of America.

We certainly want to keep it all on a civil basis.

We have many technical genius members here, and your query could be addressed.

Personally, I think that there may be safety issues with your planned direction.

and as Keiser31 stated,

"I thought I just read an answer to your post on the H.A.M.B. It is new years day, so it may take a while to get some answers."<!-- google_ad_section_end -->

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Charles,

While I totally agree with you, it is still his option to degrade his Buick.

I just hope that his modification does not become a safety hazard on the highway, both for his sake, as well as the guy or gal, or kid he needs to avoid.

GM knew what they were doing when the car was designed....

Different or new does not always mean better.

I concur that the Treadle-Vac is the best way to go. Mine works great on the '54 Caddy.

But again -- not everybody is wiling to accept the wisdom which comes with experience

thanks marty, for your thoughts. i know i upgraded my 53's standard brake master cylinder in 1977 with 54 pontiac treadle vac set up, it was all a simple swapping of parts. i learned many years laters that after the 54 pontiacs started production, pontiac urged it's dealers to invite 53 pontiac owners to come back in if they wanted to get the treadle vac system. i hope the 55 buick special owner will take in stride, some well founded, and hard learned advise from those of us whose odometer has already gone around a time or two. charles coker, 1953 pontiac tech advisor.

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A 55 Special with power brakes is a rare bird. Not sure why you would necessarily want power brakes but if you are going to use this car as a daily driver can certainly understand why you'd want a safety net of a dual master cylinder. The closest I know of is a early Corvette unit that comes from Master Power Brakes. It has a 3 bolt mount flange but I think you'll still need to fabricate a longer rod. They also have a remote fill for it so you won't have to remove the floor mat.

Master Power Brakes - CORVETTE DUAL MASTER CYLINDER CONVERSION KIT

Edited by MrEarl (see edit history)

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I'm going with something like this mounted to the firewall. 8 inch booster will provide enough braking power to stop the old girl 8" Dual Brake Booster Master Cylinder Firewall Swing Pedal Kit Street Rat Rod | eBay

Is that 8" booster a single or dual diaphragm unit? A single diaphragm in that small a diameter is unlikely to provide enough boost. Keep in mind that the factory GM single diaphragm boosters were 11". Also, the master cylinder in that photo appears to be a disk/drum unit. You'll want a drum/drum M/C. Personally, I'd simply use a factory style booster from a wrecking yard with a drum/drum M/C from a mid-1960s GM full size. Obviously you'll need to do some plumbing changes to accommodate the dual circuit brakes. You can use a factory-style drum brake distribution block (NOT a proportioning valve) but that's only mandatory if you desire the differential pressure switch and associated BRAKE light on the dash. If not, simply plumb the rear M/C port to the rear brakes and use a brass tee to split the front M/C port to the two front brakes. This is both easy and a good safety measure for a regularly driven car. I'm struggling to understand the comments above about this becoming a "hazard" on the highway... :rolleyes:

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[TD=class: alt1, bgcolor: #F2F2F2].I understand that the brake lines in the 55 special are 1 inch. Any advice is appreciated. Tony

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It's been many years since I sold my 55 Special, But I do know that it did not have 1 inch brake lines, nor has any other car that I've ever owned or worked on. It would take 10 gallons of fluid to fill the system!?!?

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It's been many years since I sold my 55 Special, But I do know that it did not have 1 inch brake lines, nor has any other car that I've ever owned or worked on. It would take 10 gallons of fluid to fill the system!?!?

john, you are so right, lol, i think the brake lines are more like 1/8th or 3/16th in size, i know the master cylinder on my 53 pontiac is 1 inch, the front wheel cyls are 1 1/16th, and the rear wheel cyls are 7/8th size. charles coker, 1953 pontiac tech advisor.

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Is that 8" booster a single or dual diaphragm unit? A single diaphragm in that small a diameter is unlikely to provide enough boost. Keep in mind that the factory GM single diaphragm boosters were 11". Also, the master cylinder in that photo appears to be a disk/drum unit. You'll want a drum/drum M/C. Personally, I'd simply use a factory style booster from a wrecking yard with a drum/drum M/C from a mid-1960s GM full size. Obviously you'll need to do some plumbing changes to accommodate the dual circuit brakes. You can use a factory-style drum brake distribution block (NOT a proportioning valve) but that's only mandatory if you desire the differential pressure switch and associated BRAKE light on the dash. If not, simply plumb the rear M/C port to the rear brakes and use a brass tee to split the front M/C port to the two front brakes. This is both easy and a good safety measure for a regularly driven car. I'm struggling to understand the comments above about this becoming a "hazard" on the highway... :rolleyes:

i guess joe has never driven a treadle vac equipped car, single diaphram and the diameter is about 7 or 8 inches. providing all the vacuum boost needed to stop the car. charles coker, 1953 pontiac tech advisor.

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It's been many years since I sold my 55 Special, But I do know that it did not have 1 inch brake lines, nor has any other car that I've ever owned or worked on. It would take 10 gallons of fluid to fill the system!?!?

I saw that earlier above and thought it was a misprint, that's why I didn't answer.:confused:

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:confused:

Yeah, well so does the Roadmaster.

I knew the Special had smaller brakes......:eek:

Specials and Supers have 2 1/4" shoes. Roadmasters have 2 1/2".

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i guess joe has never driven a treadle vac equipped car, single diaphram and the diameter is about 7 or 8 inches. providing all the vacuum boost needed to stop the car. charles coker, 1953 pontiac tech advisor.

A treadle vac is NOT the conventional booster design in the photo. I HAVE driven cars like that. More to the point, the treadle vac applies force on the brake pedal arm and uses leverage. The conventional booster in the photo is in-line with the M/C and has no additional mechanical advantage. Your comment is neither correct nor helpful. Sorry.

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