1969 F250 Brakes confused

[Fordinblue20]

Hello everyone I’m having trouble installing the master cylinder and brake pressure differential valve
My truck is drum brakes all the way around.. and I can’t seem to get the valve in there.

[Ranchero50]

Is the proportioning valve on the frame rail like the F-350's?

[Fordinblue20]

Yes it is. Sits right behind the steering box. The brake lines won’t bend Enough to fit and I’m also missing the brake light switch that goes on the valve.

[Ranchero50]

They'll fit, just learn to bend them with your fingertips. Takes a while to learn but you'll figure it out.

[Fordinblue20]

Thank you! finally got it to fit. My only problem now is I don't have the bolts to mount the master cylinder to the firewall. I do not know the size.

[Ranchero50]

Like most things in life it'll be the ones that fit. Most likely 5/16" or 3/8". Measure the thickness of the master cylinder flange and add 2x the diameter of the bolt to the length for the correct one.