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Old 02-11-2007, 01:18 PM   #1
Draggn66
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Booster Question.....

Ok I just picked up a 3/4 ton booster and master cylinder off a 70 pickup with disc brakes. I want to intstall it on my 71 1/2 ton with disc brakes. Do I have to use the 3/4 ton master cyl or can I use the "new" 1/2 ton cyl that is on my 71? Also what about the proportining valve? Will the one on my 71 work or do I need to get one for a 3/4 ton? Anything else I need to know for the swap? TIA.....
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Last edited by Draggn66; 02-11-2007 at 01:19 PM.
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Old 02-11-2007, 01:22 PM   #2
msgross
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Re: Booster Question.....

pretty sure that you need a 3/4 ton MC with the booster. Prop valve should be good if it's for disc/drum but the lines will need switched. 3/4 and 1 ton lines are reversed from 1/2ton, so I have been told.
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Old 02-11-2007, 01:22 PM   #3
Aarons72s
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Re: Booster Question.....

You did get the brackets that 3/4 booster mounts to, right? If not go get them if you can you will need them along with the rods to if I rember reading correctly. The 3/4 ton master cylinder has to be used with the3/4 booster. Some one tried to mix a 3/4 ton booster with 1/2 ton master cylinder and it didnt work. Not sure on the proportioning valve but someone will chime in.
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Old 02-11-2007, 01:25 PM   #4
Draggn66
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Re: Booster Question.....

Quote:
Originally Posted by Aarons72s View Post
You did get the brackets that 3/4 booster mounts to, right?
Yes the booster is complete with the rods and the firewall brackets

Now the 3/4 booster is an upgrade right? Duel diaphram?
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Last edited by Draggn66; 02-11-2007 at 01:27 PM.
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Old 02-11-2007, 01:30 PM   #5
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Re: Booster Question.....

Yes alot better than the 1/2 ton one is.
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Old 02-11-2007, 03:38 PM   #6
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Re: Booster Question.....

This is what I am planning. I have the 1 ton brackets, booster and MC but my booster has fluid coming out of the vacuum line! Looks like I have a core with a good set of brackets. I am redoing all of my brakes as well and adding discs. Very popular and economical upgrade.
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1968 K-10 SWB - "Project Money Pit"
1996 Z-71 - "huntin rig"
1969 C-10 LWB (SOLD) "Project flip that truck or else"
1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie"


My Garage Build "The 1,000 footer"
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