Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
Bleed the opposite side from where you left off to center the brake warning switch but first make sure it's not the parking brake on.
It should be under the master cylinder, the wire grounds through that switch, so you would just have to unhook it, not bypass it. If when you unhook it the light goes out, then it is the switch.
If this has hydro-boost, weak power steering fluid pressure could cause the light to come on.
I asked that you bleed the opposite side you finished up with the center that valve and switch, so you should have left off at the left front, so bleed one of the rear and see if the light remains of then.
Follow the brake lines from the master cylinder and where they go into a combination metering/proportioning valve, that is where the brake warning switch is, on that valve. It should just be the one wire.
Actually it appears there may be 2 wires, a purple wire and a black wire with black being the ground. Look on the underside of the ebcm (electronic brake control module)..
What do you mean it works normal now. If it's disconnected, that is not normal. Do you just mean when you disconnected the wires, the brake warning light went out?
The brake warning light on my Chevelle is stuck on, too. I am going to have to remove my metering valve and stick in a very thin screwdriver into the hole where the switch unscrew and center the switch.
I assume you may also have a stuck warning switch but I cannot tell you off the top of my head how to center it. I'll see if I can find a procedure, but I can say that even if you re-center it it may stick again, so I suggest you just replace it or take it apart and try to clean it.
If you expect the light not to be on when you just turn the key on engine off, keep in mind that the parking brake wire would also have to be disconnected. If the light I out with the engine running but comes back on as soon as you hook it back up, that switch is stuck.
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