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78bronco
05-18-2007, 12:48 PM
ok so im wanting to convert to 4 wheel discs on my bronco and at the same time im also converting to chevy hydro-boost but I cant find a disc disc master cylinder. so will the one for disc drum work safely on a 4wheel disc set up? and also should I get the proper disc/disc prop valve?

Kinslayer
05-18-2007, 12:54 PM
Should work fine. All the conversion kits i've seen don't even make mention of it.

m j
05-18-2007, 03:16 PM
mine works

I did have to replace the prop valve with a new one but it was malfunctioning prior to the disc swap

there is a hold off valve that you can disable to make it "correct"

78bronco
05-18-2007, 09:34 PM
cool I was thinking I might just get the proper prop valve cause the stock bronco one is fucked

brothergrimms
05-18-2007, 11:49 PM
its 60 at mopac for the prop valve doin 4 wheel disc myself good luck on swap[cheers]

m j
05-19-2007, 12:31 PM
which prop valve is $60? the add on adjustable or a real combo valve?

if it is the add on you will still have to tear into the factory combo valve to disable the metering parts

there is already some proportioning being done mechanically on my swap, huge twin pistons up front and tiny 3/4ton chev calipers in the rear
broncos do not have quite as bad a wieght bias as pu trucks as well

78bronco
05-19-2007, 01:05 PM
im buying the real combo valve and when I checked it was around a 110.00$ usd

FU Toolbag
05-19-2007, 03:19 PM
I didn't run any porportioning valve in mine, never a problem. I'm probably going disks in the fu with a ford desiel master mount and a chev hydro boost setup. The vacume boost will give you maybee 500psi, the hydro, about 3000. I'm worried about the rubber lines now.

m j
05-19-2007, 08:20 PM
there is no line pressure difference between vacuum or hydro boost

FU Toolbag
05-21-2007, 01:44 AM
there is no line pressure difference between vacuum or hydro boost

I beleive you are mistaken

Apathy
05-22-2007, 04:08 PM
one thing to think about. Drums require more parasidic drag than disks. Normally there is a "check valve" of sorts someplace in the drum line to help maintain slight pressure on your brake cylinder. I've seen this in some rigs as just a ball bearing in the load side of your master cylinder

m j
05-22-2007, 06:19 PM
"residual pressure valve"
a spring loaded check ball

Apathy
05-22-2007, 06:28 PM
"residual pressure valve"
a spring loaded check ball

thats the one.

Magna
05-22-2007, 07:45 PM
I beleive you are mistaken
[stupid]

FU Toolbag
05-24-2007, 09:23 PM
[stupid]

who you callin stupid?? :dontknow: :dontknow:


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