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#1 |
Registered User
Join Date: Aug 2009
Location: Sweden
Posts: 3
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What is this brake thing?
Hi all!
Iīve been working on my brakes on my -68 swb stepper, and need som help. It originally had a l6 and manual drum brakes, itīs been updated somewhere along the line and now has a 350+th350 and the brakes are disks up front and stock rear drums with hydroboost power assist. Since I bought the truck last summer I had brake problems, because the rears were locking up before the fronts and I had no real power assist. So I have overhauled the calipers, main cylinder and replaced the wheel cylinders since one of them was leaking, and also one of the wheel seals were leaking, and thatīs also been taken care of. Anyway, today when I was lying under the truck I discovered this thing, connected to the rear brake line. It sits on the frame, on the passenger side just in front of the rear spring. What does it do? Do I need it? Does it hurt anything? It is not connected to anything, electrically or mechanicaly, I canīt understand what itīs supposed to do? |
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#2 |
Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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Re: What is this brake thing?
a "hill holder" of sorts? my old studebakers had them. interesting.
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#3 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: What is this brake thing?
Just guessing, but I wonder if it's some kind of (adjustable) proportioning valve.
K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#4 |
Registered User
Join Date: Jan 2009
Location: Queen Creek Arizona
Posts: 56
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Re: What is this brake thing?
I with adjustable proportioning valve, I saw one on a jeep my buddy was building
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#5 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: What is this brake thing?
it sounds more like when the brakes were modded, the old prop valve for drum drum was still used, you might have to swith the prop valve for a disk drum run so the rears wont lock up so quickly,
as for the pic, Ive never see one of those before on our trucks. Hmmm
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1967custom |
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#6 |
Registered User
Join Date: Jun 2009
Location: Hesperia, CA
Posts: 159
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Re: What is this brake thing?
That is a brake proportioning valve. Not stock. Since you are running front disc and rear drum I would remove the that unit and either put in a union or run a new hard line altogether. I assume you are running a disc/drum brake master cylinder.
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#7 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: What is this brake thing?
What he said.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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#8 |
Registered User
Join Date: Aug 2009
Location: Sweden
Posts: 3
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Re: What is this brake thing?
Thanks for the replies!
The prop valve is for disks front and drums rear, and the master cylinder is also for disks/drums. I think I will go ahead and just remove the thing. |
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