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03-14-2011, 07:40 PM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Spokane Valley, Washington
Posts: 12
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can anyone tell me what this does?
Its on an 84 GMC 4x4 frame i just bought. i know it has something to do with brakes but Ive no idea what its for. I have worked on older 73-79 chevy 4x4's and never seen this. do i need it?
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03-14-2011, 08:07 PM
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#2 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: can anyone tell me what this does?
Yes, it's a load activated brake system. You can find those under heavy halfs and heavier trucks. I don't know the full details. It does adjust brake pressure to the rear when the truck is weighted down. Do you plan to carry heavy loads?
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03-14-2011, 08:11 PM
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#3 |
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Registered User
Join Date: Mar 2011
Location: Spokane Valley, Washington
Posts: 12
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Re: can anyone tell me what this does?
probably be towing my 20 foot searay and camping gear. but Ive swapped in 1 ton axles and hydroboost.
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03-14-2011, 08:14 PM
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#4 |
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Registered User
Join Date: Mar 2003
Location: wichita falls tx
Posts: 429
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Re: can anyone tell me what this does?
Thats right, the more weight on the rear end (the more the rear suspension compresses) the more pressure is available to the rear brakes. You can remove it but you may need to replace the propotioning valve with one from a truck that did not have this valve, or install an adjustable prop valve in its place to get the correct pressure to the rear brakes.
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03-14-2011, 08:16 PM
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#5 |
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Registered User
Join Date: Mar 2011
Location: Spokane Valley, Washington
Posts: 12
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Re: can anyone tell me what this does?
i had planned on a new proportioning valve as i have front and rear discs. no more big drums on the 14 bolt.
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03-14-2011, 08:28 PM
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#6 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,469
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Re: can anyone tell me what this does?
My dually *had* that factory. I think my 84 had it too. Took it off never looked back.
__________________
2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS |
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03-14-2011, 08:44 PM
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#7 |
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Registered User
Join Date: Mar 2011
Location: Spokane Valley, Washington
Posts: 12
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Re: can anyone tell me what this does?
whats the best way to remove it? as far as bridging the gap between the 2 lines?
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03-14-2011, 08:57 PM
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#8 |
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Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: can anyone tell me what this does?
just splice them together with a union fitting
__________________
"I'll keep my guns, money, and freedom. You can keep the "change" |
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03-14-2011, 09:03 PM
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#9 |
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Registered User
Join Date: Mar 2011
Location: Spokane Valley, Washington
Posts: 12
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Re: can anyone tell me what this does?
do they make them for 2 different sizes? one fitting is larger than the other.
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03-14-2011, 09:11 PM
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#10 |
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Registered User
Join Date: Aug 2009
Location: Lambertville MI
Posts: 962
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Re: can anyone tell me what this does?
if the actual lines are buth the same size (should be 3/16) then you can use this. if not, cut the line before the valve and run that line right into the splitter block on the alxe
http://images110.fotki.com/v559/phot...onunion-vi.jpg
__________________
"I'll keep my guns, money, and freedom. You can keep the "change" |
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