Parking Brake Light won't go out.... - Team Camaro Tech
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post #1 of 11 (permalink) Old Feb 6th, 10, 09:18 PM Thread Starter
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Parking Brake Light won't go out....

Hey guys. Just trying to figure something out. Was working on my gauges and just replaced all my bulbs....and guess what, my parking brake light is on all the time now! I don't even have a parking brake. When I bought the car, I saw someone cut the cables underneath. I see the contact switch that the wire plugs into and I also pulled my fuse block off trying to see where else the wires lead. Now they go somewhere into the engine compartment?!? I think that little plastic push switch might be the problem, but how do you test the theory. What makes the light go out?
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post #2 of 11 (permalink) Old Feb 6th, 10, 10:01 PM
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Re: Parking Brake Light won't go out....

The circuit is completed when the parking brake pedal is pushed in allowing the spring on the parking brake switch to close it. Unplugging (or cutting) the wire from the back of the switch and taping it or otherwise making sure it does not ground should permanently disconnect it.

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post #3 of 11 (permalink) Old Feb 7th, 10, 02:25 AM
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Re: Parking Brake Light won't go out....

That switch is just like a door pin switch in operation... and I think you can find in the help section at your local parts store.

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post #4 of 11 (permalink) Old Feb 7th, 10, 03:26 AM
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Re: Parking Brake Light won't go out....

There are 2 things that could make the light come on. It is looking for a ground. Disconnect the wire from the switch on the E. Brake and see if it goes off. Also disconnect the wire on the H block below the master cylinder. There is a valve in it that pushes back and forth if the brake fluid is low or something is wrong with the brakes. You can also disconnect that wire to see if the light goes off.

The valve in the H block is in the middle when there is no problems. If you loose brake fliuid in the back brakes the fluid from the front brakes will push the valve to the back of the H block which groinds the switch and the light comes on and vice versa if there is a leak in the front brakes.

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post #5 of 11 (permalink) Old Jul 12th, 10, 10:58 PM Thread Starter
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Re: Parking Brake Light won't go out....

So I pulled the wire off the H block on the master cylinder and the light went off. So this means I have some kind of brake issue? What is the best way to test that valve position or reposition it to center to test it again. What do you guys recomend to find faults?

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post #6 of 11 (permalink) Old Jul 13th, 10, 03:26 PM
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Re: Parking Brake Light won't go out....

The H-block is a differential pressure switch. It has a little spool valve in it that should be centered if the brakes have equal pressure on the front and rear. Sometimes during bleeding the spool valve can be pushed to one end or the other. You can try doing a brake bleed again. While you pump the pedal, apply pressure and have your helper slowly open a bleeder on a front wheel, watch the light to see if it goes out. Holler at your helper to close the bleeder when the light goes out. If this doesn't work, try doing it again with the rear. If that doesn't work you may have a bad differential pressure switch. They are known for getting sludged up and often stick. Hopefully the process I described will get you going again though. Good luck.

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post #7 of 11 (permalink) Old Jul 18th, 10, 07:07 PM Thread Starter
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Re: Parking Brake Light won't go out....

Well, I tried to bleed the brakes. I bled quite a bit from the front....nothing changed. Went to the back and NO Fluid at all!
Had my buddy press on the brakes and the back will not even stop. How much fluid do I need to bleed from the front brakes? How do you ever put new lines in and bleed them when the valve will cutoff flow? Seems weird. So if the valve is stuck, what's the best place to get a new one?

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post #8 of 11 (permalink) Old Jul 19th, 10, 03:12 AM
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Re: Parking Brake Light won't go out....

You might be able to reset/recenter it by pumping up the brakes, if you can, opening a front bleeder, and rapidly press the brake pedal.

There is a tool to hold the plunger center when bleeding the system.

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post #9 of 11 (permalink) Old Jul 19th, 10, 06:40 AM
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Re: Parking Brake Light won't go out....

Sounds to me like the switch is actually working properly. It informed you that there was a rear brake issue. Had you not changed the bulb, it may have taken you awhile to find this issue.

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post #10 of 11 (permalink) Old Jul 19th, 10, 07:07 AM Thread Starter
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Re: Parking Brake Light won't go out....

True, now just trying to figure out how to get fluid back to the rear brakes again. I will try to open the fronts and pump the brakes. I have no idea how long I haven't had rear brakes.... But I will still need that tool if I want to bleed my rear brakes, or the same thing will happen again.

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post #11 of 11 (permalink) Old Jul 19th, 10, 08:48 AM
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Re: Parking Brake Light won't go out....

You won't need the tool to hold the valve if you bleed the system as normal.
Just don't open up the bleeder WOT, 1/4 turn or less is all that is needed.

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