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#1
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69 A body master cylinder rebuild kit
OK, basic stuff here. 69 A body brake master cylinder rebuild. Drum-drum. power assist.
Do I have a 1" bore or 1.25" bore. Think its the latter but have not disassembled yet. I kind of want to rebuild it out of spite. Kits used to be dirt cheap, under 5$ Now you can not find them and they are 30$ if you can. Its for my strip car so if I can not get it done cheap I will go all the way with Wilwood stuff. Right now its semi marginal for braking, 12" booster running high 10s. New engine will have over 100 more horsepower, So far it seems to be true, could not hook it up and un prepped track in mild testing. So I just want to rebuild my stock master cylinder and go from there. If it works OK, fine. And it should be good enough to power one of these Wilwood front disc brake kits made for drum conversions https://www.wilwood.com/BrakeKits/Br...+Brake+Spindle. This rebuild kit might do the job. But does not say if its 1" or 1.25". https://www.partsgeek.com/dh2frf9-po...19051118008005 Like i said, I kinda want to rebuild it out of spite. Thanks for any help brake guys. |
#2
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1" bore with the drum brakes. 1 1/8" with discs.
I've seen two drum brake rebuild kits on ebay over the last year. Both were over $85. The kit you mentioned above is for a Bendix MC used on the B bodies. Not the same as the Delco unit for the A bodies
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2007 Cadillac SRX 2015 Chevy Express 2024 Cadillac LYRIQ |
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#3
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My master cylinder has bleeders right above both brake lines. None of the cheap rebuilt units I have seen online have those. |
#4
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It may not be the cheapest way to go, but if you like your MC (convenient bleeder screws, etc) and it works well as part of your brake system, I'd have that master cylinder SS sleeved and get a kit from the rebuilder.....there used to be a place FOR YEARS that had a monthly ad in Hemmings called "White Post Restorations", they were out of NY, I think....start there if you want....?? Good luck.
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#5
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Yep, basically new kits for 68/69 A bodies with power drum aren't being made anymore. I ended up finding one on ebay a couple years ago.
I also wanted to keep the original MC with the bleeders. I keep a ebay search for the part number going all the time, almost never come up, when they do they close to $100 for a 40 year old, often dried out looking kit, sometimes missing parts.
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I'm World's Best Hyperbolist !! |
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#6
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It is nice that there are companies that do that sort of thing though. I can imagine finding pre war brake parts difficult. I was helping a old boss restore a military 6x6 truck from WWII. It had a Continental flat head 6 in it. The carb was this cast iron one barrel that they started making in the teens-20s. Finding floats, needles and seats and gaskets was a nightmare. I ended up making him a adapter to run a carb from a Clark airport tractor he had with the same Continental engine. We got it running and made a parade. Gas tank was so full of holes a had enough hours silver soldering them and coating the inside he could have had a new one custom made. A open cab Dodge 6x6 is pretty cool ! |
#7
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https://www.amazon.com/Dorman-M71277...69+Pontiac+GTO And thay have this one Amazon says fits for 57$, looks different but made in AMERICA ( I think?) https://www.amazon.com/Centric-Parts...69+Pontiac+GTO Out of spite I am buying the first one and if my original bore is not pitted, swap the seals. Sad they can sell us a whole unit for 36$ but won't sell us the seals for 15$, They would make more profit selling the seals. Its almost like you have to fight being a do it yourself guy these days. |
The Following User Says Thank You to Dragncar For This Useful Post: | ||
#8
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I’m willing to bet that “made in USA” involves someone snapping the bail over the cap and calling it a day.
First Brands owns centric, and fram, raybestos, and a few others. Pretty sure I’ve read on here Fram is now being made in some Asian country, I cannot imagine centric being any different.
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costs too much |
#9
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So, what is involved in switching a factory power brake car to manual brakes ?
Looking at Wilwood stuff they make front disc brake kits that work with power or manual brakes. It would be lighter and cleaner just getting rid of the booster and the disc upgrade should get me enough braking without the booster. My rear drums are oversized from a 59 Ford pickup. I do have a manual brake donor 69 A body. Wilwood makes a MC kit to tun it to manual brakes, 388$ Its a 15/16 MC. Can we get a 15/16" stock type MC ? Last edited by Dragncar; 12-18-2023 at 06:19 PM. |
#10
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Try your 69 master - we did this with a 68 Firebird and it worked superb - depends on piston size with the Wilwood calipers.
Baer looks to have a nice 15/16" unit here: https://baer.com/GM-Cast-Iron-.9375-...r-6150012.html Last edited by Scarebird; 12-18-2023 at 07:55 PM. |
#11
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Yep, it appears the internals are still be made, but only available in a rebuilt core. I actually thought about buying a rebuilt MC just to get the internals.
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I'm World's Best Hyperbolist !! |
#12
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So, if I get a stock type 15/16" MC what is involved in the switch ? Just get a rod from a factory manual brake car and swap the parts ?
I think I am going to get this Wilwood kit. Its the one they recommend for a car like mine drag racing. Its pretty basic, not too expensive. https://www.summitracing.com/parts/wil-140-10996r Thinking going with that and a stock type MC and maybe switching to the 400$ Wilwood unit at a later date. |
#13
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Sort of related, I'm just in the middle of rebuilding my front disc brakes, converted by the previous owner. I didn't know what he used for the conversion so I just rolled the dice and ordered all lines, seals, bearings and caliper rebuild sets for a '69 GTO. It all fits perfectly.
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Greg Reid Palmetto, Georgia Last edited by Greg Reid; 12-19-2023 at 06:23 PM. |
#14
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Wilwood is overrated; Baer is a better set for the money.
This uses the stock 69-72 rotors with 99-04 Cobra calipers - all stuff you can get from NAPA or Rockauto... that and the goofy tapered Wilwood hubs grind my gears - whyTF don't they make them hub centric? |
#15
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It all is probably frozen up after all these years. |
#16
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Mine were pretty crusty. Cleaned up well with some effort though.
All of this started with a way overdue shock absorber change... but I just couldn't ignore this mess any longer. Sorry for the hijack. Back to topic! Sent from my moto g stylus (2021) using Tapatalk
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Greg Reid Palmetto, Georgia |
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