1957 and 1958 power brake conversion help

jacob

Active Member
Hi, I'm hoping someone experienced with 57 and 58 Buicks can help me out. I am working on a bolt in power brake conversion for a 1957 Roadmaster. I have painstakingly designed a new firewall mounted box that bolts in place and allows a brake pedal bracket to go through the factory air vent opening. I know the 57 and 58 roadmasters share the same firewall, but I am wondering if the 57-58 Specials and Centuries have the same or a different firewall as the larger cars? in other words, would this plate that I have made for a Roadmaster bolt up to a Special?

Thanks and here are some pictures of what I am working on.

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-Jacob
 
Jacob,
The Buick parts catalogue shows the original left ventilation air duct dash opening cover is part no 1178527 for all '57 series. It shows the '58 cover is a no 1181633 for all series. At least this shows the junior series cars use the same cover as the senior cars each year. Could not find out the difference between the '57 and '58 covers. It may be something minor that doesn't affect the design of your new cover. Too, the left ventilation valve is the same no. on all '57-58 cars.

The cowl/dash part nos don't help. The junior series cars have their own nos. since they are 2-3" narrower overall than the senior series cars. On top of that, the Estate Wagons, using bodies by Ionia, have still different part numbers.
 
Thanks for the info Todd, that's really helpful! I have 1957 and 58 Roadmaster air boxes and they looked identical but I will look more closely to be sure. It sounds like this brake kit will work on all 57 and 58 Buicks.
 
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