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Hello everyone, I am about to ask a dumb question, Where can i find information on how to install a powerbrake booster and pedal assembly under the dash and on the firewall. Here is what
i got as vehicle and parts i have come across. I have a 38 chevy pickup and we want to put the powerbrakes on the firewall, and have hanging pedals. the powerbrakes are out of a 77 chevy pickup is this a good choice, and i took the pedal brackets out also and the steering column too. so with this all together i was wanting to know does anyone have something close to show me how they have installed there's. I hope you all can help me out. thanks and have a good day.. if you need to you can email me pics of what you have done, or explain to me also. [email protected] :confused:
 

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This will be a matter of trying to dupicate the original mounting in the 77 pickup on your 38. You will have to design and fabricate your own brackets to hold your system.

Several members have done conversions like this in their Project Journals but it will take a bit of searching to find them. Perhaps they will see this post and tell you were to look. If not go to the index page of the jounals and start searching.

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Discussion Starter · #3 ·
Thanks for the advice!

Hey there homebrew. thank you for contacting me, hopefully i will find something on it ,that other builders have done in the past and present. Thanks for the heads up. Take care.
 

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Streetrodder 31 I hung the pedals and master cylinder on my 39 gmc. Its not to difficult. I used an assemly out of a 66 buick. I redid the entire firewall to smooth it out which in turn made the firewall alot stiffer. Also I welded a 1 1/2 x 1 1/2 tube inside the cab behind the lower part of the dash to anchor the back of the assembly to. It also made a solid mount for my steering colum.

http://hotrodders.com/gallery/showphoto.php/photo/12498/cat/500/page/2

http://hotrodders.com/gallery/showphoto.php/photo/22402/cat/500/page/1
 

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Streetrodder I Am Building A 46 Gmc This Was How We Changed Ours. Lined Up Steering Shaft Then Mounted The Bracket That Is The Backup For The Power Buster And The Column Then Checked The Clearance Of The Booster And M/c(hood, Valve Covers) The Next Thing To Do Was To Check How The Brake Pedal Will Hang And How Much Travel To The Floor You Have. You May Have To Add Supports For Dash To Top Of Cowl To Stabilize The Column And Pedal.
 

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i did something like this with a 53 dodge truck a couple years ago (sorry no pics).. i had an 78 blazer frame and drive train, and put the dodge body on it.. i used everything out of the blazer i could and it work very well, including the whole wiring system, fuse block, steering wheel.. by doing this, everything work, including the turn signals and key ignition. it wasnt that hard either really, just cut holes in the firewall where everything need to be, made some brackets and mounted it. good luck
 

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stiffen firewall

Think yoiu need to reinforce the firewall as susggested, with extra sheet metal or brackets.
BUT
Suggest some Googling for more info, think there is much made aftermarket for like 37 chev pickups. Getcherself some rod mags and browse, mark who has possible items, and then go to their websites. Its more $$$$ than cut it out, trim it out, and weld it in, but COULD save you headaches. At least U will get more ideas from the search.

Rotsa Ruck

MELLO
 

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Let me echo the need for reinforcement of the firewall. Factory firewall-mounted master cylinders are not supported just by the firewall. There is always a large, stiff U-shaped reinforcement under the dash. Usually this part also serves as the hinge point for the brake pedal, so the loads associated with pushing on the M/C are carried by this heavy stamped part, NOT the firewall. A flat sheet metal firewall is not stiff enough to do this alone and will eventually fatigue and crack - which can result in no brakes when you need them the most.
 

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Someone on here convinced me to NOT attach my pedal box to the firewall as it will flex and crack your paint (among other things). I built a side-to-side brace from 1 x 1 x 1/8" wall tubing that sits 1" behind the firewall. But then, my pedal box is completely under the firewall (reverse hung pedals) with nothing protruding through so of course, your setup will look different.

Russ
 

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joe_padavano said:
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Let me echo the need for reinforcement of the firewall.
...
Me too. :)

87-91 Ford trucks used to have a hydraulic master cylinder mounted directly to the firewall, resulting in metal fatigue and eventual cracking. Ford came up with a "firewall reinforcement kit" to correct the problem.
 

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Good advice, You will definitely have to reinforce the firewall. I used a piece of 1/8 inch plate large enough to cover a substantial area on the inside with the pedal assembly and booster bolted through it and the bracket of the pedals supported by a cross brace behind the dash

Make sure the pedal sits where it is comfortable to operate and you have room to reach and work the gas pedal And as mentioned previously by someone, they clear everthing.


That is pretty much what I did on my 48 in 1980 but have since taken the thing out and put a smaller booster and cylinder assembly under the floor.

Mounted on the firewall it works great and is very convenient but is one big ugly zit there that detracts from the otherwise sanitary engine compartment.
That is only my personal opinion concerning my own rigs.
 

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I will be adding power brakes to my 56 this summer. I don't like the idea of it sticking out under the hood either (very stock truck!), so it is also going under the floor in the stock master cylinder location and using the stock brake pedal.

Looking under the hood and in the cab, no one will know it has power brakes.

That is unless they crawl under the cab. :mwink:
 

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yep agreed

Ditto here, they need SOMETHING whatever U decide on...
Those with underfloor setups obviously dont need to worry.
But since HATE bleeding brakes I would not go underfloor
unless it was a 100% upgrade to discs andfully modern system,
but think the underfloor would NOT work with modern system???
Only rambling, but with check valves etc mebbeeit wood....?
Rotsa Ruck

MELLO :cool:
 
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