proportioning valve button - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

 
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post #1 of 6 (permalink) Old Jun 11th, 04, 11:40 PM Thread Starter
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what does that button in the back of the valve do..70 chevelle SS

1970 Chevelle SS 396
2004 Intimidator Monte Carlo SS
1992 K5 Blazer SS

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post #2 of 6 (permalink) Old Jun 12th, 04, 2:51 PM
 
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The button is so that you have a way to re-center the piston in the valve that turns on your brake warning light. This works off of pressure differential between the front and rear halves of the valve. Sometimes the pin needs to be pushed in to allow one side or the other to be bled out. Hope this helps
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post #3 of 6 (permalink) Old Jun 12th, 04, 9:18 PM Thread Starter
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I am talking about the valve under the master cylinder..are you?
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post #4 of 6 (permalink) Old Jun 13th, 04, 4:29 PM
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I think '70 used this system. The roundish looking device (with the big hex nut on its front) hanging below the master cylinder is the Metering Valve. Its button needs to be held in (probably with a C-clamp) when pressure or vacuum bleeding the front brakes.

The proportioning valve is down on the frame and does the distributing forward and rear. It also has the "BRAKE" warning light switch. I have no idea if there is also a "reset" button on that dist. block...if there is, I can't find it.
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post #5 of 6 (permalink) Old Jun 14th, 04, 9:08 PM
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my driverside front is locked but the other 3 work. i just changed to discs any of you guys have any ideas
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post #6 of 6 (permalink) Old Jun 15th, 04, 5:38 PM
 
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Faulty caliper, did you grease the slide pins, something caught in the caliper?
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