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  #16 (permalink)  
Old 09-11-2018, 12:58 PM
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Quote:
Originally Posted by PHWOARchild View Post
It should have a simple brass block. I don't recall what year a brake warning light made it onto trucks though. A picture would help. If you have not replaced both front brake hoses I would do so first.
1967 was the first year for federally mandated dual circuit braking systems, and the associated differential pressure switch, in passenger cars. I don't know if trucks were also required to convert that year. If this car has a dual circuit M/C, the distribution block will have an internal piston with an electrical contact. If there is a significant pressure differential in one half of the brakes (such as can happen when you bleed the backs and haven't yet bled the fronts) this piston gets forced all the way to one side, which can block the outlet port to the other half of the system and cause all kinds of havoc.

Also, a stock M/C for your drum brake system should already have the residual pressure valves built into the outlet ports of the M/C. There is no need for additional valves.




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Old 09-11-2018, 01:53 PM
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I recall bleeding some brakes and chasing that light back and forth a bunch of times. Like anything else in an old car or truck, get a new one. Although the new stuff is sometimes crap these days.
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Old 09-11-2018, 02:08 PM
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I am 99% sure it is a distribution block. Click image for larger version

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Old 09-11-2018, 02:29 PM
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They get called different things depending on what you read. Most are called proportioning valves. The later ones were a bunch hairier and ABS... forget about it. This is why I like old cars.


This is a CPP one from Summit for a '68 C10.
https://www.summitracing.com/parts/c...del/c10-pickup


This is the one I have on my car, but you don't need the brake light switch... or could it be hooked up to a warning light if you wanted?
https://www.summitracing.com/parts/ssb-a0730
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Old 09-11-2018, 02:32 PM
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Quote:
Originally Posted by PHWOARchild View Post
They get called different things depending on what you read. Most are called proportioning valves. The later ones were a bunch hairier and ABS... forget about it. This is why I like old cars.
That is NOT a proportioning valve. There is nothing inside of it that does any "proportioning" or any modification of the line pressure. The device in the picture is ONLY a differential pressure switch. All it does is trigger the BRAKE light on the dash shortly AFTER your foot goes all the way to the floor.
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Old 09-11-2018, 02:43 PM
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Ok, I will be headed to the part store to get the Brake Hoses after work and I will put those on (they are cheap so why not) and I will take a look at the Distribution box and see what I can figure out with what everyone has told me. I will update after I tinker with it a little bit. What joe_padavano said about the valve being forced to one side and blocking the fronts seems like it would make a lot of sense.
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Old 09-11-2018, 02:54 PM
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And since you’ll have it apart look for check valves in the master.
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Old 09-11-2018, 02:59 PM
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You can get a little insert to hold the piston in place in the block while you bleed the brakes. It replaces the switch.
One like this.
Parts store might have one.
https://www.ebay.com/itm/Combination...-/173122702608
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Old 09-11-2018, 07:45 PM
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Replaced the front brake hoses and bleed them first without doing anything with the distribution block just to see if it would be that easy and it was. Brakes are good and strong. Thanks everyone
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Old 09-12-2018, 04:11 AM
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Quote:
Originally Posted by BENNETB101 View Post
Replaced the front brake hoses and bleed them first without doing anything with the distribution block just to see if it would be that easy and it was. Brakes are good and strong. Thanks everyone
The inner lining of the hose can come loose and act like a check valve. Glad it was that easy.
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