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  #231  
Old 09-27-2018, 08:49 PM
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79jasper 79jasper is offline
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Ah, I see.

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2003 F250 KR SCSB FX4
Depleted, studded, airdog (which isn't currently hooked up), fass regulated return, airaide, 4 inch straight pipe with mbrp muffler(so on to go), glowchit pyro, fuel, boost, and trans temp. (Of course don't work lol) Hercules terra track A/T2 315/70/17.
2013 Honda pilot Touring
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  #232  
Old 09-28-2018, 05:28 AM
Diesel_Brad Diesel_Brad is offline
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Billy,

Following........
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Some trucks
  #233  
Old 11-23-2018, 08:54 PM
rusty1161 rusty1161 is offline
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Quote:
Originally Posted by gnxtc2 View Post
I'm gonna re-open this thread.....

As you know, I've done the hydroboost conversion. I'm just not too happy with the brake pedal feel. The pedal feels harder than I would like it to be. Don't get me wrong, the truck does stop without issue.

I drove a 1994 C/C F-SD truck with the same hydroboost set up. The 1994 had discs all the way around. But the 1994 had that load sensing valve in the rear that regulated the pressure going to the rear. That rear set up is discontinued. The pedal feel in the 1994 was way better.

I relocated the brake pin on the pedal which helped but not that much. I also installed the correct proportioning valve on the master. It helped.

The feeling I get is a harder pedal but more of numb type braking.

Feels like when I installed a large bore (1-1/8") manual master in the race car. At the time of install, I had four wheel disc but was going to do dual rear calipers in the future. When I eventually installed the additional calipers in the rear, the pedal felt way better.

The OEM master for the 1997 trucks is 1-1/4 bore vs 1 5/16 bore for the F-SD truck. I'm beginning to think that the bigger bore master is too much for a disc/drum set set up.

So what I've been thinking of doing to my truck....
- Put the original master back and slot/enlarging the mounting holes (cheaper)

or

- Swapping in the hydroboost that accepts the stock master so I don't have to slot the mounting holes and install the stock master (more money but looks legit).

I've also thought about installing an adjustable proportioning for the rear brakes?

Also, I've heard about porting a hydroboost unit. Anyone know whats involved in that mod?

Billy T.
gnxtc2@aol.com
Billy,

Is it possible the pushrod is too long? I’ve read a few posts in other threads where this conversion has been done and the pushrod was too long. Some were just shimmed with washers to fix the problem, others shortened the pushrod itself. Just a thought to consider before you change master cylinders.

Rusty
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1997 F250 CC/SB 7.3 PSD 4X4 XLT, 363SXE, PIS 160/30, John Wood Towmaster, 3" RSK, 265,000 miles

Last edited by rusty1161; 11-23-2018 at 09:00 PM.
  #234  
Old 11-29-2018, 12:50 PM
rusty1161 rusty1161 is offline
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So, in the process of chasing down my issue with dragging front disc brakes, I started with replacing the calipers, since the pistons were hanging up and not releasing.

Further searches and research came across the issue others have had with the hydroboost MC pushrod length. Too long and the piston doesn’t retract fully and the compensating ports stay covered making it so the brakes can’t fully release. Well, I finally checked mine and what I found is in the pics. This is with the two nuts that secure the MC completely loose, and as far as the MC will sit back against the pushrod without compressing the piston inside the MC. The common spec is for no load on the piston and about .020” clearance. The gap shown is .040” so I have temporarily shimmed mine with a 1/8” body shim that measures out to be .061”, so I’m right at .020” pushrod clearance. Time and miles will tell if this was part of the issue, but after the first couple of tanks I am up an average 3 MPG.

This hydroboost is a Motorcraft unit and came with the pushrod. My MC is aftermarket, so that might be where the clearance issue was created.

I’ll update if this is the fix long term.

Rusty
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1997 F250 CC/SB 7.3 PSD 4X4 XLT, 363SXE, PIS 160/30, John Wood Towmaster, 3" RSK, 265,000 miles

Last edited by rusty1161; 11-29-2018 at 12:56 PM.
  #235  
Old 01-15-2019, 11:28 AM
96SuperDuperDuty 96SuperDuperDuty is offline
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Has anyone figured out a mod to lower the pedal height with the F450 pedal?

I just did the hydroboost conversion - F450 Hydrobooster, Stock F250 Master cylinder(widened mounting holes), F450 Brake pedal. After all these years the I finally have brakes that I feel comfortable with. There is definitely more pressure required but they work every time and I can lock the wheels up, no problem. I'm very happy with the conversion but the high pedal height is a little annoying. I was thinking about putting a 1/2 aluminum spacer plate between the booster and the firewall or between the pedal bracket and the firewall. It look like the booster studs are long enough to accommodate this so it might be worth a shot. Has anyone else done a mod to lower the pedal height?
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1996 F250 Powerstroke, Banks Powerpack, 4" Lift, 35" Tires, Hydroboost Conversion.
  #236  
Old 01-15-2019, 11:45 AM
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gnxtc2 gnxtc2 is offline
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Then you have to play with the brake light switch.

Billy T.
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'97 Black F250HD SC, 3.55s, Punisher Trans, PI Converter, Dana 60 RSK w/ V & C SD springs, PIS 175/80s, T500, Cale's tunes, 910s, Smith Bros, ARPs, Fluidampr, IC, E-Fuel, 3" Plenums, CJC Traction blocks, HFHV IDM, T4/BASB, Horton, 268K
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  #237  
Old 01-17-2019, 06:33 PM
78-79fordman 78-79fordman is offline
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any thoughts on just buying this kit ?
http://www.hydratechbraking.com/Ford..._F_Series.html
  #238  
Old 07-16-2019, 09:18 AM
Mysocks4 Mysocks4 is offline
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Quote:
Originally Posted by 78-79fordman View Post
any thoughts on just buying this kit ?
http://www.hydratechbraking.com/Ford..._F_Series.html
Did you end up going with this kit? Looks legit..
  #239  
Old 07-21-2019, 07:21 PM
Devilman Devilman is offline
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Quote:
Originally Posted by Mysocks4 View Post
Did you end up going with this kit? Looks legit..
My question also? I've been looking at it and have spoke with Hydratech and they're telling me it'll work with our trucks. Just wanna talk to someone who's actually installed the kit
  #240  
Old 07-21-2019, 10:29 PM
78-79fordman 78-79fordman is offline
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No I have not yet . As soon as I have booster it master cylinder problems. I will try it out . But I would like to hear from someone that's used it on obs 7.3 .
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