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Reply to "Front braking power suddenly gone"

The suggestions are all valid, but one thing that can cut both brakes off from one end of a Pantera is the near-useless (IMHO) brake warning light shuttle valve, mounted under the booster. It moves inside in response to brake fluid motion, and if the shuttle valve has built-up varnish inside, it can disconnect either the 2 front or the 2 rear brakes depending on which way it moves and sticks. Bleeding brakes, huge modified calipers etc. can activate & stick it.

While these valves are found on a variety of -'60- '70 U.S. cars, the Pantera is one of the few that does NOT have a return spring on either end of the shuttle's bore. So if the shuttle valve moves into a seldom-used space inside a bore that has varnish build-up, it can stick. Usually then needing physical force to return it:  an air compressor, a small rod etc. and can be very messy to work with in-place. If this happened and it came back by itself, you may have just gotten lucky- that time.

all that shuttle valve does is turn on a red warning light on the dash to warn of "low" brake fluid- which is easily visible thru the reservoir. Problem is, three OTHER functions also turn on the very same light and you can't easily tell which thing happened to cause it. It can be removed, disassembled and cleaned but I usually take them off and put the whole assembly on a shelf where it can't cause confusion. IMHO, it is NOT much help to the average driver. Good luck.

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