Hi guys, I have a 1970 f250 4x4. I resonantly replaced the front axel (drum brakes) for a 1978 dana 44 disk brake system. Everything is mounted on the truck well but I'm have trouble finding the correct break booster. Any ideas?

 

What kind of issues are you having? I am assuming that the original booster from the '78 is not mounting properly? Is it the attachment to the brake pedal?

 

I used a Cardone 54-73112 booster. Listed for 76 F250 and many others as well. You'll also need the brackets that go between the booster and the firewall and I doubt there's a new source so a trip to the wreckers would be your best bet for them.

 

The 54-73112 dual diaphragm booster/brackets is what I have in my truck. The input rod on this booster (between the brake pedal to the back of the booster) is not adjustable in length.

The 54-73112 number is sort of a generic number that spans across the Bumpside and Dentside F350 dual diaphragm boosters. IF you use this booster, see if you can get one specific to a '68-'72 F350. It will come with an adjustable input rod.

F350 dual diaphragm booster with the adjustable inout rod I installed in my friend's '72 F100 Sport Custom. The input rod code on it is FT8.







From the 1969 Ford Truck Shop Manual.




The '75 F350 dual diaphragm booster I have in my truck does not have the adjustable input rod.

 

You'll notice in the service manual picture there is also a plastic spacer bushing in there. The purpose I believe is as an air seal between the engine compartment and the cab. I know you can buy those but I can't find in my stuff where I got mine (on line).

 

Here I found it.
https://www.performanceonline.com/Po...-Booster-Boot/

 

It's a dust boot. This is what the OEM dust boot looks like.

 

Looks like I found one that would work, thanks for the help!

 

National Parts Depot has the whole thing. Price is good too.

 

I pick up the booster from a 70 pick up with the M/C and took it whole unit to a loco rebuilder.

I have found out over the yrs that many M/C have different inner depth stroke.
If you get one with a shorter stroke M/C then the pedal won't go all the way to the floor causing the M/C to bottom out about 2/3 from the floor board= sheet metal.

Also the booster, I am using just fits with little clearance from the valve cover, but not using the oem valve covers but the tall Aluminum finned ones about 1"between the two.

I know the later larger 73 & 79 would have a mounting issues unless the whole later pedal set was used that sets the booster higher on the fire wall.

Orich

 

Orich's booster is the single diaphragm, non-bellcrank booster that would have been optionally available on the '68-'72 F100s or on the '68-'72 F250s with 4-wheel drums.

The dual diaphragm, non-bellcrank boosters were optionally available on the '68-'72 F350s with the optional front discs.

In '73, single diaphragm, non-bellcrank as well as bellcrank boosters were available. The bellcrank style mounting brackets lifted the booster up nearly 3" higher than where the non-bellcrank booster would be situated.

Non-bellcrank bracket assembly on a dual diaphragm booster. (booster assembly from a '74 F350).



Single diaphragm booster on a non-bellcrank bracket. (booster from a '68 F250 with 4-wheel drums).



11" dia. single diaphragm booster on a bellcrank bracket assembly. (this setup from a '78 F150). Notice it has a 'flat' input rod to the bellcrank assembly. The flat input rod on this booster is longer than the one used on this same style booster from '73-'77. You would have to modify (shorten) the '78/'79 input rod to line up with the brake pedal on a '68-'72 model truck.



Beginning in '77, the trucks with a 460 had dual diaphragm boosters mounted to this same style bellcrank bracket assembly. This would raise the booster up high enough to clear a big Ford engine with tall valve covers.