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Originally Posted by austinporsche
Can someone help me with a step-by-step to diagnosing my flashing brake warning light (1973 1/2 911T)?
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Had the same thing happen to me a few years ago.
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Here's the current state and what I've done so far:
- The brake warning light on the oil temp/pressure gauge is flashing. After a period period it was intermittent, it now flashes all the time
- I checked the brake warning switch on the master cylinder, cleaned at the connections as reset
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As John Walker noted, it stopped when I disconnected the connector from the the switch on the brake master cylinder (it is only for the warning light, not the brake lights). You can buy just the switch and replace it like I did. Once you remove the wheel and gravel guard for the steering rack, it is easily accessible. If you have a firm pedal then you do not need a new cylinder.
FWIW, the switch is an USA only feature and I know for a fact it only comes on a milli second after your foot hits the floor due to a failed hydraulic system (I had it happen in a 1972 Ford Station Wagon when I was on a freeway exit ramp and the car was loaded to it's maximum load).
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- I checked my brake lights (my wife is not a very willing helper -- she hates my car -- so I had to wait to she was in an exceptionally good mood to ask for help) and they are not working. I checked the bulbs and they are good.
Could it be that the flashing warning light is due to the brake pedal switch having failed? I have not found anything in any of my manuals (owners, Haynes, etc.) that indicates that the warning light flashes when a bulb is out or the pedal switch has failed. Also, I have found no evidence that there is a stop light relay -- is this correct?
Thanks in advance for any help.
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If you need to test your brake pedal and do not want to ask for help. Get a short stick that you can wedge between the brake pedal and your steering wheel. Jam it in there and you are good to go. It is also handy when you are doing brake work where you need to remove a brake line and do not want to drain your entire brake system.