Seller notes

Inline Tube - PR102A - 71-77 GM Factory Disc Brake Proportioning Valve Correct Switch. This is the switch only that is in the top of the Prop. Valve of all 71-77 GM cars. Your brake warning light lead plugs in and if there is a loss of pressure a warning light in the dash will be on. THE PROBLEM: When you buy an after market valve from one of the disc brake companies you get the 78 and newer valve with the plastic lead, so your existing wiring plug will not work so now you have to buy a new lead...

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