brak conversion on 68 with 73 stuff

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 6:33 pm

help on disc conv. i am a newby so bear with me. i have a 68 no power any thing. i put 73 spindels,73 calip., 73 mastercylinder, for non power brakes front disc rear drum i have no leaks and no brakes what is wrong

customcrewcab · Post by **customcrewcab** » Sat Feb 16, 2008 6:59 pm

did you get them all bleed out. they have a kit so you can bleed out the master into itself so you can get most of the air out . then i would bleed out each corner.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 7:09 pm

yea ,ms, all corners, i have done brakes before but never swaping to disc, also everybody has powerbrakes i dont! i dont think it has anything to do with it but i dont know also i will be doing all 4 corners with disc do i use a ms from drum/drum

fordman · Post by **fordman** » Sat Feb 16, 2008 7:33 pm

so you got fluid to come out of each brake set as you bleed them? is the master cylinder used? maybe its bad.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 7:40 pm

yea. fluid is clear no bubs at all corners all stuff is new. good ol dad thinks i need to let it set over night to let all the new seals soak. also not trying to get mushy but this site and the people on it rock! i thought it would take days to get a responce

Joshpow · Post by **Joshpow** » Sat Feb 16, 2008 7:42 pm

Just wondering, did you change the proportioning valve also? If not, the discs won't get correct pressure. Also, the master cylinder has to change for the discs. My understandings is a drum master cylinder won't push enough volume to operate discs. If you use 4 wheel discs, you need a proportioning valve and master cylinder from a 4 wheel disc vehicle. If you use front disc rear drum, you need a disc/drum master cylinder and proportioniong valve. Also, I would suggest going power if you have discs. Just my

.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 7:49 pm

no i did not change a prop valve i did change ms from drum/drum to disc/drum

Joshpow · Post by **Joshpow** » Sat Feb 16, 2008 7:59 pm

you definately need a proportioning valve set up for your current configuration of discs and drums. If you have disc fron drum rear, you can use the prop valve from a 73-79. If you have 4 wheel disc,I don't know exactly what valve to tell you to use.

fordman · Post by **fordman** » Sat Feb 16, 2008 8:11 pm

427blackpearl wrote:yea. fluid is clear no bubs at all corners all stuff is new. good ol dad thinks i need to let it set over night to let all the new seals soak. also not trying to get mushy but this site and the people on it rock! i thought it would take days to get a responce

I LOVE YOU. how is that for mushy. brakes that is. yes you need the porportioning vavle for disc / drums when you do this swap. i am not sure this is the problem but it could be.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 8:30 pm

thanks i will look at the parts truck tomorrow to get the valve off it if it has one also i put 4 wheel disc on a 71 bronco and used the mastercylinder for a 4 wheel drum no prop valve it worked great can i do the same for this truck

fordman · Post by **fordman** » Sat Feb 16, 2008 9:02 pm

that could be a different deal than disc drums/ the front disc nedd a different pressure than the rear drums do. i would make a guess and say that the disc disc would need equal pressure all the way around.

Joshpow · Post by **Joshpow** » Sat Feb 16, 2008 10:22 pm

I agree. The disc/disc would need higher rear pressure than rear drum. The drum/drum prop valve won't allow enough pressure to push 4 wheel discs I don't think.

Oh, and by the way 427blackpearl, are you going to the F100 Nationals show in Knoxville at Chilhowie Park? Us guys that are going plan on meeting up with one another somewhere at the show. Let us know if you plan to come.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 10:39 pm

yes. i'm not doing all this work just to look good when i go to the dump on saturdays. maby i will have it all dun by then.

427blackpearl · Post by **427blackpearl** » Sat Feb 16, 2008 10:41 pm

p.s. how many people from this site go or get together there

fordman · Post by **fordman** » Sun Feb 17, 2008 2:47 am

so who is building a show truck for the dump guy to see?

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brak conversion on 68 with 73 stuff

brak conversion on 68 with 73 stuff

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