so i picked up a hydoboost from a 450 with rear disk brakes

[Alex S]

so i picked up a hydoboost from a 92 F450 with rear disk brakes, is the master cylinder different from the rear drum one?

Also the push rod eye hole is a bit bigger then my brake pedal pin (it was an auto mine is a stick) it looks like it will be about 1/16 of slop, is that a big deal?

thx

 

[icanfixall]

You really need the standard trans brake peddle. It has the pin in the correct position too. Use the larger master cylinder. Its a 1 5/16 inch bore... Way better than the 1 1/16 or 1 1/8 mc. The pin slop will be your call but remember this is what stops you. In an accident a good attorney will find this and things can get ugly. Just a simple upgrade isn't a issue in court but a poorly done modification that is a contribueting factor to the accident is...

 

[Ironman03R]

There should be a plastis bushing that takes up the slop your seing. I used my factory master cylinder because I knew it was a good one, I had to enlarge the mounting holes a bit. Truck stops much better now.

 

[zpd307]

there is a bushing for the slop. i just did this and there was no difference between hydro and vacuum booster rods.

 

[Alex S]

ok thanks guys ! also i read that you should use the 450 reservoir because it has the 2 low pressure returns and not to "T" it into the existing one because it will cause the brakes to drag. I have used the "T" method before on GMs and a Scout with no problems. Has anyone use a "T" on there Fords? with good results.

 

[Ironman03R]

Do you mean for the power steering pump? Its pretty cheap from Ford, I just bought it so I wouldnt have to make any new hoses.

 

[LCAM-01XA]

ok thanks guys ! also i read that you should use the 450 reservoir because it has the 2 low pressure returns and not to "T" it into the existing one because it will cause the brakes to drag. I have used the "T" method before on GMs and a Scout with no problems. Has anyone use a "T" on there Fords? with good results.

It ain't cause your brakes will drag, it's cause under certain conditions the single return line after the T-ee cannot handle the flows from both the PS box and the hydroboost at the same time, and this can cause one to "bind" - it's a rare situation, but it is possible, I have managed to duplicate it in my old Chev by turning the steering wheel really quick and pumping the brakes (as if to avoid a car that pulled out in front of me in a snow-covered parking lot).

 

[Alex S]

OK thanks allot guys!

 

[LCAM-01XA]

Alex, if you do have to use a T-ee fitting for the return lines, connect it so the line off the hydroboost has the straight shot through it, and the PS return line gets the side port. Don't recall exactly why that is, but the folks from Vanco PBS recommend it's done that way, and IIRC some folks on Pirate 4x4 shared this opinion.

 

[Alex S]

ya i'll use a *T* for now and when i get a chance i'll grab the reservoir out of the 450

 

[LCAM-01XA]

Actually in my old Chev I used a Y-fitting, it still had two ports opposite of each other (the straight shot through for the hydroboost return), but the side port was not at 90* angle, but 45*, this way the two return flows have a bit easier time merging - most parts stores sell such Y-fittings, maybe it's a good idea to use one of those instead of a simple T-ee fitting?

 

[Alex S]

ya good idea, i'll take a look