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  #1  
Old 06-15-2006, 09:31 PM
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Default Another brake light problem

I've read the two recent posts on no brake lights and I'm still stumped. Here's the deal:

- Running lights work fine.
- Turn signals work fine.
- No brake lights.
- Good brakes adn MC is full.
- If I short a screwdriver across the switch terminals on the master cylinder with the wires connected, I get brake lights.
- If I pull the wires and put a nail in each socket and touch the nails together, I get brake lights.

So, that means I've got power to the switch and good connections to the switch. This would lead me to replace the switch, but I did that in 2002 with a brand new NAPA unit. (The NAPA guy said this switch was used for nearly every Ford from about 1940 to 1980!) The brakes lights were working fine after I put the switch in, I'm not sure when they quit.

I tried pulling the switch and filling it with brake fluid (although I just poured it in, I didn't have a syringe) adn that didn't help eitehr. Is there a way to bleed the system at the master cylinder? I di re-do the MC, all wheel cylinders and rubber lines back in 2002, perhaps there's a connection?

I'm stumped, any ideas?
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  #2  
Old 06-15-2006, 10:03 PM
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Default RE: Another brake light problem

Master cylinders can be bleed on a bench, but I do not think that air in the system is a problem here, since you have good working brakes. Either your brake switch has gone bad or there is an obstruction in the port for the brake switch.

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  #3  
Old 06-15-2006, 10:04 PM
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Default RE: Another brake light problem

sounds like your switch died!

You can bench test it with some compressed air. Put a multimeter across the two leads - they should be open in Resistance mode. Apply air pressure into the hole where brake fluid would go. If it remains open (infinite resistance) then it's dead.

Personally, I keep a spare one around. I had two of them die on my motorcycle in the space of a year (identical setup)

I have heard, but not verified, that DOT 5 can cause one to die that was previously used with DOT 3.

John
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  #4  
Old 06-15-2006, 11:18 PM
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Default RE: Another brake light problem

No DOT 5, I'm using DOT 3-4. I have the old switch, I'll try that one and check the port. The switch was less than $8, so I'll get a new one if that doesn't work. Seems odd that the switch would quit, but oh well.

Thanks.
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  #5  
Old 06-16-2006, 01:01 AM
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Default RE: Another brake light problem

Hi,
Did the brake lights work before you replaced the M/C? It is possible to bleed the M/C on the car, as a matter of fact I had to bleed mine to get it working, you just pump and hold, then crack the line at the M/C .after you get all the air then it would be a good idea to bleed the rest while you are at it. You might even be able to bleed the switch the same way. Hope this helps


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  #6  
Old 06-16-2006, 01:04 PM
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Default RE: Another brake light problem

Definatley sounds like the switch as you are getting good power to where you need it,. i have heard of these things going out at any time and sometimes jus for sitting around
m

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Old 06-16-2006, 02:18 PM
tarps3 tarps3 is offline
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Default RE: Another brake light problem

I thought my switch had gone bad once, but as it turns out, the 90-degree push on connectors (the electrical plugs to the switch) were just worn. They weren't tight enough on the posts to provide a consistent contact.

I squeezed them slightly with some pliers, pushed them back on, and have had no problems since.

it's worth a try..
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  #8  
Old 06-22-2006, 01:57 AM
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Default RE: Another brake light problem

It was the switch. $4.99 from Autozone and I've got lights again.

Thanks all.
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