Chevy Blazer

How do you know if your brake switch is bad for a 2001 blazer?


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2014-09-02 12:50:46
2014-09-02 12:50:46

If the brake light fuse is good and the brake light bulbs are good it's probably a faulty brake light switch.

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There's should be a brake light switch under the dash right behind the brake pedal arm. Sounds like it needs to be re-adjusted. The switch has a plunger that pulls out. Pull it all the way out, then just press the brake pedal down. You should hear a clicking as the plunger is re-adjusting back into the switch. Your just re-adjusting the plunger so that when you let off the brake pedal it will not be pushing on the brake light switch. hope this helped

If you want to know if you can leave the brake switch out of the master cylinder the answer is no, it will leak. If you can plug the hole with something that does not protrude into the housing to seal it the MC should still work, you just won't have any brake lights. Be aware though the Master Cylinder creates a large amount of pressure when you step on brake pedal so you need to screw something into it or it will just blow out or leak. You can use an electric micro switch on the pedal itself like the modern cars do to keep the brake lights. If you want to know if the MC will still work if keep the switch in it then yes, but again you won't have brake lights with a bad switch without using something else.

i do not know what type of vehicle you have, but most brake light switches are located behind the brake pedal. Ive not seen a switch yet that cant be accessed from under the dash just stick your head down by the brake pedal and look up you should see it where the brake pedal rests.

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Sounds like you have a problem with your brake light switch under the dash, mounted on your brake pedal metal arm assembly. I know if I get my head down near the brake pedal and push the pedal with my hand I can hear a loud click noise when the brake lights come on. I'm not a mechanic, but I've wondered if the brake fluid level is down in the master cylinder, does the brake pedal drop enough for the brake light switch to turn on the brake lights ?

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