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11-16-2004, 08:50 AM
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#1 |
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Registered User
Join Date: Mar 2001
Location: Raeford, NC.
Posts: 34
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break and booster question
I put a booster out of a 78 suburbon in my 70 truck and it leaks, can i rebuild it myself. Also I put disks and a proportning valve off a 72, the rear will lock up if I apply the breaks hard. Iasthere an adjustment on the pro valve.
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11-16-2004, 02:13 PM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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If you come up with a parts source please post. I have been looking for the cylinder shaft and seal with no luck. This is the usual leak area for boosters,
although the diaphrams can leak. Jim |
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11-16-2004, 05:46 PM
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#3 |
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Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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Is your '70 drum/drum or did you convert to front discs. Discs take a lot more brake fluid & would explain why your proportioning valve from a 72 (disc/drum) would send too little to the front brakes, causign the back to lockup before the front even really grab.
__________________
85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days!  05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal! 
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11-16-2004, 07:02 PM
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#4 |
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Registered User
Join Date: Mar 2001
Location: Raeford, NC.
Posts: 34
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more info
the 70 was a drum/drum. Now it has disk/drum from a 72 and a pro valve and master cylinder for a 72 disk/drum. All the break components are new accept the lines. Could the lines be the problem
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11-16-2004, 08:36 PM
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#5 |
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Senior Member
Join Date: Sep 2004
Location: CANADA
Posts: 1,681
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if the booster is bad you can not rebuild it at home.
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11-16-2004, 08:42 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Never heard of rebuild kits of any type myself.
As for your locking up...all your brake parts are 72 with the exception of the booster, correct? How easily does the rear lock up? You can replace the non adjustable factory unit with an adjustable one from any performance dealer. (Jegs, Summit) Then fine tune your front to rear adjustment in a big parking lot at different speeds and even conditions. (turning, loaded, wet roads...ect) |
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11-18-2004, 06:33 AM
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#7 |
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Registered User
Join Date: Mar 2001
Location: Raeford, NC.
Posts: 34
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thank you
Thank you all for all the help for all the problems I have encountered. This soldier says thanks. I will try to find adjustable valves and make the corrections.
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11-18-2004, 06:59 AM
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#8 |
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Senior Member
 Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,722
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The rear brakes are always supposed to lock up first before the front disc brakes when braking hard because otherwise the rear of truck will past the front in a spin if front brakes locked up first.
GMCPaul |
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11-18-2004, 08:02 AM
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#9 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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exactly, that is why I was asking how easily they lock up in back. Plus, they are also set more towards braking with a load which does hinder the stopping when empty. I've been wanting to look into a prop valve that adjusts according to how much weight is in the bed. I know later fords have this feature...seems like a pretty good idea IMO.
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11-19-2004, 07:56 AM
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#10 |
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Registered User
Join Date: Mar 2001
Location: Raeford, NC.
Posts: 34
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All of this information will help. It locks up when I try hard to stop. I think I dont really have a problem now. Thank you
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