Firewall Mount Master Cylider on 1951 F1
 

Looking to mount a new master cylinder and booster assembly on the firewall. I see CPP and POL have diagrams on where to mount but they are for a 53-56. What are the dimensions for where to place the mount on a 1951 stock firewall? As always thanks for the help.

Depends on pedal position, engine compartment room and the size of the booster. I use OEM stuff but I would do it the same way with aftermarket. Put the pedal set where you want it so it is comfortable and clears the steering column. Then using those measurements mark the firewall and see if you have room for the booster (assuming power brakes). If not move around as necessary so that everything fits in the cab and in the engine compartment. Mine ended up here, no idea of the measurements. Be ready to reinforce the firewall, the 51 is pretty flimsy.

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Here's where the PO put it on Tony's 50. I like that the gas pedal and brake are both to right of steering column. I wouldn't want to have to leapfrog around column every time I went for the brake. OK if auto and you are a left foot braker (I'm not) I guess. Personally when I put hanging pedals in my 56 I dummied the pedal assembly first until I found where they were most comfortable for driving, then let that determine where the MC ended up. I wanted my heel to be able to rest on the floor and be able to use the pedals like in my daily drivers. Exact position is going to depend on pedal assembly.
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I have to make this decision soon too. I assume that you have to buy new hanging pedals if you want to put the booster/MC assy on the firewall? Or is there a way to use the the stock pedals?

I modified a hanging pedal set from a 93 Camaro to widen the gap between the brake and clutch pedal so they would straddle the steering column. The PO had used a aftermarket hanging clutch pedal with the stock under floor brake pedal! It worked (sorta) but looked like he!! and felt awkward, so I moved the brake MC to the firewall with the hydraulic clutch MC.
If you are using an auto trans, you have to decide if you want a thru the floor or a hanging brake pedal. The MC mounts under the floor in the former choice or on the firewall with the latter. If you decide to use a hanging pedal you might look at and measure the pedal assembly on you jeep, the dash to firewall distance may be similar making that assembly a candidate for a donor, but most any from a vehicle with a vertical firewall could likely be easily modified.

Different boosters will have different spacing and layout of the mounting bolts, so I normally get the pedals from the same vehicle as the booster so that they bolt up together naturally. Lately I have been using 1993-1997 camaro/firebird setups but have also used early S10 and 78-88 GM G body as well (monte carlo and its similar body styles). Just depends on pedal fit. Most 1980s stuff has smaller diameter dual diaphragm boosters so they fit better than the earlier 1960s/70s stuff, but anything can be made to work with enough head scratching. I am sure there are Ford options as well, I am just more familiar with the GM stuff.

It is important to brace the pedal mount And MC mount doubler back to the dash to resist the pressure of applying the brakes so the firewall doesn't flex and crack.

Yep, I make mine from scrap cutoffs. I also tie back to the firewall as well.

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The F1 was so flimsy I also bent up and plug welded a support brace for more firewall flex resistance.

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I used a pedal assembly from an early 90's cherokee. I ran a brace from the dash to a plate bolted to the firewall. The pedals bolted to the bottom of the brace and the firewall plate. It's very stiff, the firewall doesn't flex. The brake pedal is placed to the right of the column, near the gas. I heel and toe. The clutch had to be heated and bent to the left of the column. I cut off the standard square pedals and replaced them with oe round rubbers. I used a dual 7" booster which just clears the air cleaner.