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Technical Power Brakes on a 1955 Pontiac Chieftain?

Discussion in 'The Hokey Ass Message Board' started by chstitans42, Mar 29, 2021.

  1. chstitans42
    Joined: Feb 7, 2011
    Posts: 719


    Working on my wife's 1955 Pontiac. It has the stock single pot master (under the floor) with front/rear drum brakes. Was looking to upgrade to a dual pot master, and maybe a brake booster to make them power? Has anyone done this upgrade? Since it isn't a tri-five Chevy there are pretty much zero kits to buy. Thinking I would have to customize something. Thoughts?
  2. getow
    Joined: May 9, 2016
    Posts: 305


    Not sure but i would think that some if not most of whats available for tri5 Chevys would be interchangeable or adaptable to your Pontiac. Im not sure but prior years 49-54, the difference was after the fire wall, b4 the front tires, 4 inches or so. You would know better than me tho. Just food thought.
  3. Does a '55 Pontiac even have self-energizing brakes? If not, upgrading to them may make a noticeable improvement to your braking even without adding a booster.
  4. Rusty Heaps
    Joined: May 19, 2011
    Posts: 959

    Rusty Heaps

    You should be able to reconfigure your pedals to that of the tri-five Chevy and then everything else is bolt on to the firewall

  5. wvenfield
    Joined: Nov 23, 2006
    Posts: 5,583


    Pontiac has the heater box mounted to the firewall. There was factory power brakes but they were single units also. Could you modify something? I don't know. It mounted to the removable plate that the steering column runs through.

    We mounted a dual unit under the floor but it involved modifying a clutch z bar and my car is not stock. It's also not power.

    You are pretty much on your own with pre 60's Pontiacs.
  6. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,290

    from Kansas

    Get a Bendix Hydrovac and put that in between current master cylinder and brake lines.
  7. stuart in mn
    Joined: Nov 22, 2007
    Posts: 2,414

    stuart in mn

    I'm a regular viewer of the videos on your wife's car (and also the videos on those off-topic fiberglass cars. ;) )

    This doesn't answer your question, but a good source of information for 1955-1957 Pontiacs is , he's posted copies of factory service manuals and parts manuals, along with other useful stuff. is the main Pontiac forum online - there are a few guys in the 1960 and older tech section that I think have experience with this swap.
  8. distributorguy
    Joined: Feb 15, 2013
    Posts: 84

    from MN

    I helped a friend out with a '56 Safari last Summer. We installed an aftermarket pedal assembly and removed the stock heater to install a Wilwood master on the firewall. The aftermarket pedal had such a long ratio that the booster wasn't even necessary. This was all in effort to upgrade the motor and add headers as well as an under-dash heater and A/C system in the future. It already had the front disc brake conversion.
  9. greybeard360
    Joined: Feb 28, 2008
    Posts: 2,078


    Ever look into the Hydro-vac systems used on some trucks? Possibly adapt one to this. It can pretty much be mounted anywhere under the floor where there is room.

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