I pulled this brake booster out of a 1972 Ford F250 Camper Special. Can anyone tell me if this looks like a single or dual diaphragm?

 

It's a single. But, a 54-73112 dual diaphragm booster from the parts stores will be a direct fit onto those same brackets.

This is what I have in my '69 F100.

 

Thanks, that is want I was hoping for. I have a 1972 Ford F100 with manual drum brakes on all four wheels. This should help.

 

If you're not converting to front discs, you better stay with the single diaphragm booster. The dual diaphragm is much more powerful (more output) and the brakes will be overly sensitive.

 

is it a big difference with the dual diaphragm compared to the single? i'm needing to replace the one on my 71 ( it has 78 discs on it).

 

Ok Ultraranger that engine compartment is show worthy !! I love seeing a nice setup like that. As far as braking i have to think about stopping and some people think that trucks can stop 10 feet before the stopsign....umm they don't. So if you want to scare people in Seattle though just slowly weave steering wheel back and forth and everyone gives you lots of room !! I love doing that hehe.

 

I do not plan on converting to front discs, that is why I was hoping the booster was a single diaphragm.

 

A factory Bendix dual diaphragm brake booster has roughly twice as much applied surface area than that of the Bendix single diaphragm booster pictured.

 

so it seems nobody can get that booster (54-73112) right now- RA, Advance, Autozone, O'reilly , Napa- all are telling me it's unavailable

 

The 54-73112 number is really just a generic rebuild number for that style of dual diaphragm booster. Chances are good that the one you received under this number would have a long, non-adjustable input rod (like the one I have in my '69 F100).

If you want the dual diaphragm version that has an adjustable input rod eyelet (where it attaches to the brake pedal), you can contact Prior Automotive Products in Dallas, TX. Specify booster part number 3700131 with an input rod code of FT8. https://www.priorautomotive.com

This is an installation I did in a '65 F100. (I've also installed a dual diaphragm booster from this company in a '72 F100).

 

Thanks. However, there are still some grungy areas on my truck, just not as much as there was when I first bought it.

My truck had manual 4-wheel drums when I bought it in April, 2011. Right after I bought the truck, I went through the drums and rebuilt/replaced everything and installed a new 1.00" bore manual cast iron MC. Even with all new parts, the brakes weren't great. A few months later in 2012, I added the dual diaphragm booster. The powerful booster, coupled with a 1.00" bore MC and self-energizing 4-wheel drum brakes proved to be overly sensitive to the application of the brake pedal.

In 2014, I replaced the stock '69 F100 drum brake front suspension with a disc brake front suspension from a '77 F100. I also removed the 1.00" bore cast iron MC and replaced it with a 'modern' aluminum 1-1/16" bore MC for a '95 Ford Explorer at that time. The truck has some serious stopping power now and will quickly and controllably bring the truck down from speed.

 

this will fit the stock 71 booster bracket?

 

There are two main styles of factory vacuum boosters for this application: Those used with a bellcrank mounting bracket and those that don't mount to a bellcrank bracket.

This particular booster doesn't mount to a bellcrank bracket, since this particular type of booster has a long input rod that leads from the brake pedal and straight to the back of the booster.

A booster for a bellcrank mounting bracket will have a very short input rod with an eyelet on the end that connects to the pivoting mechanism of the bellcrank mount --the input rod of the booster itself does not directly connect to the brake pedal.

Within both types of booster configurations (bellcrank or non-bellcrank) you have single and dual diaphragm versions of the booster. In the non-bellcrank style, either the single or dual diaphragm boosters will bolt up to the same mounting brackets and both use the very same hard plastic dust boot.

In the bellcrank-mounted version, there are also single and dual diaphragm boosters and both of those are also interchangeable on the same bellcrank brackets.

So, to answer your question, if you have a factory single diaphragm booster with a long input rod, you can remove it from the firewall brackets and replace it with a long input rod dual diaphragm booster on the very same brackets. --also note: I would only recommend installing a dual diaphragm booster if you have DISCS on the front. The dual diaphragm booster makes all-wheel drums too touchy and too sensitive (I've already been down this road).

 

great info, thanks.

 

thanks ULTRA, just bought the prior booster off RA.