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Old 07-09-2005, 09:31 PM
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bad brake light switch on master cylinder?

Hey everyone,
I've been working on rewiring my car and have everything all set except for brakes pretty much, but i have a question, it might seem silly and i think i have an idea what's wrong but i wanted to make sure before i started taking stuff apart. Now, i have a brake switch that's mounted on the master cylinder, and i'm assuming that it's supposed to be an open circut that's closed when the brakes are pushed so that the power goes through to the other wire. The problem is, i ran power to the switch, and there's always power coming through it to the other terminal. When i hooked everything up, the taillights came on (dim) and when you hit the brakes they brightened up like they should. When i hooked a tester light on it, same thing happaned, always power running through even with the car and lights off, and the key out. This is just a bad brake switch right? It couldn't be something in the directional signal box right? And, when i take the switch out to put a new one in, i should bleed the brakes again right? oh and here's the type switch i have if it helps switch

thanks a bunch!!

Frank

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Old 07-09-2005, 10:05 PM
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The hot to the brake lamp switch is constant hot (non-keyed). That is why when they go bad in the closed position, the brake lamps stay on.

Just connect the two pins at the switch (bypass switch). If the brake lamps come on, it is a defective switch. If the tail lamps comes on, you have a bad socket/bulb or leakge in the circuit. It may be a bad signal switch also as both circuits go through the switch.

If you are quick, you will not need to bleed (or have someone gently push down on the brake pedal while you do the final tightening).

Does this help?
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Old 07-09-2005, 10:28 PM
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We used to change those type switches all the time and never bled the system afterward.
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Old 07-10-2005, 06:34 AM
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hey kultulz, thanks for bailing me out again, connecting the pins at the switch does turn on the brake lamps, not the parking lamps, so a new switch is goin in today! I might try having someone push gently on the brakes, i don't want to have to bleed the brakes and add more fluid then spill brake fluid on my fresh paint i wouldn't be surprised if i did something like that and totally ruined my fender lol. MI2600 do you just change out the switch real quick without someone pressing on it? thanks a bunch for the replies, i'll let you know how the new switch goes

Frank
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