trucks.com/user_gallery/sizeimage.php?&photoid=191255&.jpg[/img]

 

I installed the fuller fs5306 today. Its a big heavy monster, had to slide it under the truck on a creeper lift it with a engine hoist through the passenger door then get a floor jack under it to get it at the correct angle for the input shaft.. took 5hrs, l lost track how many times I got under the cab then in the cab .. I had to move my hydrovac unit back 8in to make room for the trans.
picts in gallery

 

It's coming along pretty nice.

Have you considered going to a split (front/back) brake system?

I replaced all my brake components with new and I will say that it does have excellent brakes.

1 leak though and it has NO brakes. (except the F-450 Superduty parking brake.....and I wouldn't want to rely on that to get me stopped!!)

I could downshift...that E4OD will do a good of that....and I'll have complete control of downshift points etc...but I'd really like to have a split brake system.

 

Yes I would like a split system. I was going to use a duel resv. master cyl. but both front and rear brake lines would feed into the hydrovav booster and a single line would come out of the booster so that won't work. .. Could I use a duel resv. master cyl. and two hydrovac boosters?
One for the front and one for the back.
I still need to find a vacuum pump that I can use one the Cummins.

 

That's exactly how I was thinking about doing it. You may still need to regulate the front or back brake pressure. to prevent applying too much front or back.
I don't know how the 56 is but 53-55 they put single piston wheel cyls in the front and 4 separate (dual piston) wheel cyls in the back. The piston diameter is larger in the back. that makes actuation pressure to operate the back less but it will take more volume since there's 8 pistons to move instead of 2


A good way to experiment would be to put brake pressure gages on it and jut see what they're doing.

If you use a standard dual master (Floor mounted) that you can probably buy for a F100/250, then finding another hydrovac wouldn't be that hard. I have been seeing new ones on ebay from time to time for under $100.

It would really be nice to have a split system!

 

I just had my original hydrovac booster rebuild by the power brake exchange in San Jose Ca, $135 ... I work for UPS and all the older p600 have the hydrovac unit (same as a the c600 frame, ford made the chassis) the shop forman said that the "new" imported hydrovac boosters are not holding up, he recomended to rebuild the original since it has most likely never been done.

 

Yeah that's probably a good idea.

I got my rebuilt one from Cascade Friction Materials in Tacoma, Wa a few years ago for $125.

They told me that they send them to Portland for rebuild.

 

all i can say is that i like it !!!!!!!!!!!!!!

 

Hi, I need some help finding a vacuum pump to operate my brake booster. The cummins pump is $$$. and like everybody else I'm on a tight budget. Anybody know of a pump I might find at a wrecking yard? thanks for any suggestions

 

You might consider the one that I have on my 6.5L GMC Suburban. I just replaced it last year at about 160,000 miles. I think it would run our brake boosters just fine. You could put a slightly larger vacuum tank on it to handle two boosters if needed. I bought my (reman) replacement for about $100 I think.

GM 6.5L Vacuum Pumps, Discount GM parts, General Motors, Discounted Diesel Products & Parts, van aaken, lucerix, duramax, western diesel, ats, M&S Technical Services

 

HT, Thanks for the links... Rusty

 

Hi Guys.
Since my last post I've made a place to put the duel batteries, wired the engine, made shift rods for the aux. trans, clutch linkage, mounted the 50gal fuel tank from the f700 into the bed of the 56, ran 12ft each fuel supply and return line, brake lines all hooked up. Ordered a 4 core radiator from Mid Fifty, they say It will be 4wks. Has anyone else used one of Mid Fifty's radiators? are you happy with it? Thanks for your interest my project, Rusty

 

Rusty,

I did some searching in the Rock Auto Catalog and found this:




I am thinking that it might be fairly easy to put this master cyl or one similar in place of the single model and just use 2 standard hydro-boosters.

This is a DORMAN Part # M83074 from a 1970 F350 and it retails for about $23 + shipping. It also looks like it might be fairly easy to install this MC in place of the existing one and use the "old" pedals.

This might be a good way to split the systems. Does your 56 have single piston wheel cyls on the front? I have the single cyl wheel cyls on the front and 2 wheel cyls (per wheel) on the back so the volume requirements are a lot more on the back, That might be easy to take care of by simply adjusting the front brakes a little looser than the back. I would probably put hydraulic gages both to monitor pressures to see what happens when I press the brakes.

The Surplus Center has liquid filled gages for under $15 that would be perfect.

I guess you just wouldn't want the pressures to be a lot different. I seem to remember the service manual indicating that you want the brake pressures to be around 700psi for normal braking so as long as the front and back pressures were close it should work pretty good.

 

HT,

I think that master cyl. would work. You would have to fab. up a mount. I tried a mount that Classic Performance Products sells that bolts to the stock m.cyl. location then bolt duel resv. m.cyl. to it but it did not line up with the brake pedal (off by 1in) If you recessed the stock m.cyl. location 1in it would work.
I've decided to keep my brakes stock for now so I can work on all the other problems that pop up when doing a conversion .. this is my first one!
Oh, and yes to your ? I do have the same wheel cyl set up as you. I have driven my f600 about 7k miles in 13yrs and that hydro-vac system will throw you into the windshield if your not carefull. I would still like the security of a duel resv. system so I'll save that for a later project.

 

You know, I had a look at my Chassis Parts Catalog and I noticed that the master cylinders are the same from the 51-55 F2/250 up to and including the F600!

That indicates that maybe one of the after market under floor power brake booster/master cyls would probably work just fine.

I did call one of those companies a couple years ago and they said no. they didn't have one that would work on an F-600 but I think they maybe haven't tried it. I don'y know if anyone has tried it...It would sure be nice to use one though...


Cheers,


Rick