Re: Resetting a 67 distribution block ?
The valve in question for a drum/drum brake system is a pressure differential valve. It has a valve in it that will stay centered with equal pressure front and rear. It will move to one way or the other if one end of the brake system has a pressure drop, this will provide a ground circuit to the brake warning lamp and it will light up notifying the driver that there has been a brake pressure loss. When the loss of pressure is repaired the valve can be recentered by firmly depressing the brake pedal a couple of times.
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Charles
68 SWB, Dad bought new, now 396 & factory ac
64 Impala SS, 409 425HP, 4 speed AC
64 Bel Air Wagon, 400 Small Block
57 Bel Air all original 283 w/Factory Air
77 GMC Sprint, 454/425HP
67 Olds 442, all original
90 ZR1 Corvette
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