Originally Posted by Ruckin69

What do I do with the vacuum line that goes from the intake into the old vacuum booster after the hydroboost conversion? Its a T. Do I plug if or leave it open?

Originally Posted by Shortbox4x4

Yep just cap/plug it.

Even though I used the Wildhorses4x4 Hydroboost kit....the same thing. After I took the original vacuum power assist booster off I just capped the fitting on the intake manifold.

Originally Posted by Ruckin69

I thought I read something about keeping it open or it may cause damage to the motor??????? Could be mistaken though.

Originally Posted by ford390gashog

So I got really tired of the braking system on my 76 F-250 SuperCab 2WD. I had replaced everything multiple times and it still was not that good. So I decided to do a HydroBoost conversion. Some people put way to much thinking effort into this conversion but its really is not that hard. I decided to just jump into it and get it done!All the parts I used can be found at a local parts store or junkyard I got mine from a junkyard.

Parts list
F-450 HydroBoost found on the F-SuperDuty trucks $24.00
HyrdroBoost mounting bracket from F-450 $2.00
Both pressure lines from the F-450! $19.00
Master Cylinder "NEW at NAPA" for 79 F-350 SuperCab $31.00
Power Steering Pump from the F-450 $ 20.00
Bulk High pressure 3/8'' oil cooler hose 6' $28.00

That will give you the main parts you need to get. Other parts such as clamps and oil are common sense. The install went very well and almost ZERO fab work. First remove the pushrod from the brake pedal inside the truck.Make sure you keep the stock bolt, bushing and nut you will be reusing these. Now go and remove the master cylinder and set it aside. Start unbolting the vacuum booster, start by removing the 4 nuts on the rear of the unit that hold it on to the brackets. Now remove the two brackets that held the booster to the firewall and keep the bolts you will reuse them. Go ahead and remove the black plastic dust cover that mounted between the booster and the firewall and discard. You now have a fresh start all the parts are off the truck and you are ready to mock up the HydroBoost.First start by removing the 4 studs in the HydroBoost bracket and discard them. The F-450 mounting bracket has to be removed from the HydroBoost and flipped 180 degrees to do this remove it and you will see a small tang. Just make sure you do not flip the bracket the flush side without the edges goes towards the firewall. Notice how the factory just cut a groove in the threads on the rear of the HydroBoost for the tang to fit. Go ahead and cut a new slot on the other side and make sure it is straight if not your booster will sit crooked. Now go ahead and put the mount back on the rear of the HydroBoost and tighten the nut and put the snap ring on. Take two of the stock bolts that went to the firewall and put them in the top 2 holes of the HydroBoost now bolt the hydro boost to the firewall. You will notice the bottom two holes need to be slotted upwards, mark them with a pen and remove the booster. Use a die grinder and create the slots in the bracket. Once done put all 4 bolts in and tighten down. Go inside and hookup the pushrod to the pedal. The pushrod has two sides to it one is flat the other has a bump you want the flat side towards the pedal. Reuse the stock bolt bushing and nut and tighten. Go and start running the pressure lines, the stock HydroBoost line will thread into your stock steering gear so no problems there. You will have to get creative and do some gentle bending of the tubes to adapt them to fit in these trucks. But they will fit. So one line goes from the pump to the left hand port on the HydroBoost then the right hand port goes to the steering gear. Depending on if you got the power steering pump with two return lines will determine how you will have to run the return lines. Run one return line from the stock PS cooler output to the pump then run the HydroBoost return line to the other return port on the pump (if you don't have 2 return ports on the pump just tee all 3 lines together). You're almost done go ahead and fill the PS reservoir (you may have to do it a few times after initial start once the are bubbles work their way out) bleed all the brakes. Go ahead and start the truck and check for leaks and test out your new braking power!

Originally Posted by tompa00

How did you get the f450 PS pump to bolt up to you 1976.

Originally Posted by Ruckin69

I used my old ps pump.

Originally Posted by tompa00

What year did you take that hydro boost and master cylinder out of