2000 E350 master cylinder install

6945 Views 19 Replies 5 Participants Last post by plug ugly, May 25, 2007

Andy351

Discussion Starter · May 23, 2007

9

the other day i was cruising through the local boneyard, when i saw a jack rabbit. now, its in the middle of the city so i was like whatever and followed the little guy. there i found a pretty mint looking e350. as i was cruising around it i noticed it had a D70U in back with big ol disc brakes and i was like "damn i should have built this axle for my bronco." since i already have a built axle tho, i did the next best thing and jsut swiped the master cylinder because it was only $20 and it looked cleaner than mine. i figured it couldn't be that hard to stick into my bronco and mocked it up to on in the yard. holy smokes it just might fit!

say bye bye to this puny piece of garbage

problem. the part that goes into the booster is too big to fit into the stock 1/2 ton booster. but thats ok because the plunger contacts the piston first anyway.

so i grabbed some of my room mates leftover slider tube (1" .120 DOM) and made the burliest coupler nuts ever out of the old nuts that held on the master.

i figured on the other side i'd just weld in some 3/8" lock nuts, but the teflon melted. note to self, look harder for stover nuts.

burly coupler/spacers installed after grinding down my tack tack tacks

this part is fun, you get to take the fittings off the new master and put them onto your existing brake lines. you did remember to grab those off the organ donor didn't you?

put the new master in a vice and make it bleed all over the bench

heres a terrible comparo shot. the stock bronco master has a 1 1/16" bore. the coveted f350 master has a 1 3/16 bore. mine has a 1 5/16" bore :goodfinge

now you're ready to stop like its 2000

pedal feel is now excellent. i could still get the old master cylinder to lock up 40s, if i stepped on the pedal really hard. now i don't have to step really hard. this would also be a good time to install a proportioning valve, but since i'm doing rear discs soon i will take care of that then. for now it is most excellently better.

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plug ugly

· #2 · May 23, 2007

why not go with a van booster? is it different?

Andy351

Discussion Starter · #3 · May 23, 2007

not too sure really. the 1/2 ton booster seems to do ok. the only thing i see it doing for me is making the pedal a little easier to push. you have the f350 master and booster right?

plug ugly

· #4 · May 23, 2007

not any more, I have hydro boost now. i would just worry about thel leverage with that thing hanging out like that. what is the advantage to that mc over say one from a superduty?

Archer66

· #5 · May 23, 2007

Ok, Plug.. Andy can you guys tell me something. The idea of going to a larger MC bore seems counter intuitive to me. I may be way out in the left corn field but.
The theory of a Hyd. system is the multiplication of force. whatever lbs/sq inch is applied to the master cylinder piston is the multiplied by then being applied to a larger wheel cylinder piston ... same PSI applied to a larger area = more force.

.... example bottle jack very small master that pushes on a large slave and can have tons of force...

So what am I missing??

drkhrs925

· #6 · May 23, 2007

your not missing anything archer66 you are 100% correct. The peddal will "feel" better because you can move more fluid ( i.e. shorter pedal travel ) but it will require more force to create the same preasure at the rotors.

look up any of the aftermarket manufacturers web pages

Andy351

Discussion Starter · #7 · May 23, 2007

plug ugly said:
not any more, I have hydro boost now. i would just worry about thel leverage with that thing hanging out like that. what is the advantage to that mc over say one from a superduty?

i was worried about the leverage as well, but i checked it out and it doesn't move when you get on the pedal. i'm gonna look into getting a sweet little support bracket water jetted to support the end of that master. as far as the super duty goes, i just looked it up on napa and they list a 1 3/8" bore:shocked i'm sure it would be just as good, i just got this one because it was in the junkyard. no super duties around here.

archer you're not out in the corn field, but there is a little more to it than that. me and plug are both running 1 ton axles, and f/r discs (well not me yet but am gathering the parts). as soon as i put the big axles/brakes in (3 years ago now) i noticed that the pedal was much much spongier. the front calipers on D60s are dual piston, they are easily 2x the size of TTB calipers and require a lot of fluid to be pushed. rear discs also require a lot more fluid than a wheel cylinder on a drum brake. the stock master cylinder is designed for 1/2 ton calipers and little drum brakes; the master cylinder from the E350 is setup from the factory pushing dual piston discs in front and discs in the back. you also get significantly more fluid for better heat absorption/fade resistance.

with stock brakes i would say you guys are right, i don't think this would even be necessary. it would probably do as much harm as good. however, with the big 1 ton brakes many are running i think this is a worthwhile upgrade.

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Archer66

· #8 · May 23, 2007

Ok... that was the half of the equation I had missed. :doh0715:

I've just been doing some upgrades to mine and thought perhaps there was something wrong with what I thought I had a pretty good grip on....

:beer

drkhrs925

· #9 · May 23, 2007

yep, 1 ton brakes 1 ton master 1 ton booster, and importantly 1 ton pedal leverage = 1 ton braking

plug ugly

· #10 · May 23, 2007

pedal ratio is the key, and I konw I really havent explored that or do I have much knwledge on the matter. I konw Ox is pretty up on this stuff tho.

bossind

· #11 · May 24, 2007

e450 in mine

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Archer66

· #12 · May 24, 2007

bossind said:
e450 in mine

What was the original donor for your HB setup?

bossind

· #13 · May 24, 2007

Archer66 said:
What was the original donor for your HB setup?

e450

Archer66

· #14 · May 24, 2007

Ok thought maybe the HB came out of something different than the MC.
Got a good idea of year range for the HB in the E450's ?

I'd like to start looking for a donor

Andy351

Discussion Starter · #15 · May 24, 2007

Archer66 said:
Got a good idea of year range for the HB in the E450's ?

I'd like to start looking for a donor

most anything with a diesel will have hydroboost.

are you guys running hydro boost with stock sag pumps?

bossind

· #16 · May 24, 2007

Archer66 said:
Ok thought maybe the HB came out of something different than the MC.
Got a good idea of year range for the HB in the E450's ?

I'd like to start looking for a donor

Think it was 2001 - 2003. Rod was shorter and required the brake peddle to be bent some.

bossind

· #17 · May 24, 2007

Andy351 said:
most anything with a diesel will have hydroboost.

are you guys running hydro boost with stock sag pumps?

I used the OEM one with out trouble for a year, and than upgraded to a sag. But nothing doing with the brakes, just an upgrade.

bossind

· #18 · May 24, 2007

this might help

http://www.4x4preservation.com/forums/showthread.php?t=157

Archer66

· #19 · May 24, 2007

bossind said:
this might help

http://www.4x4preservation.com/forums/showthread.php?t=157

Thanks That is great info. I like the line schematic :thumbup

plug ugly

· #20 · May 25, 2007

I modded the sag a la west texas andy. My HB unit is from Vanco tho, its hi flowed to work with the ram better.

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