Stoplight switch problem

C

coyledad46

Member
I replaced the cross shaft bushings. The stoplight switch got messed up and the rod inside broke. I installed a new switch, but the stoplight is on all the time. The mushroom head on the actuating rod is off center, but still touches the rod on the switch, though just barely. I have a new pedal shaft and bushings and a return spring gizmo on the brake pedal. What can I do to get things working properly? How far out does the rod in the switch have to be to work right?#
 
coyledad46 said:
I replaced the cross shaft bushings. The stoplight switch got messed up and the rod inside broke. I installed a new switch, but the stoplight is on all the time. The mushroom head on the actuating rod is off center, but still touches the rod on the switch, though just barely. I have a new pedal shaft and bushings and a return spring gizmo on the brake pedal. What can I do to get things working properly? How far out does the rod in the switch have to be to work right?#
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Is your actuating rod bent? you could elongate the holes in the switch for a better alignment?
 
The rod appears to be straight, hard to tell for sure lying under the car. I notice the end with the clevis is threaded, allowing adjustment. The switch contacts are open when the rod inside the switch is depressed, so I'm thinking maybe I need to figure out how far out the rod in the switch is supposed to be, or maybe it's something else.
 
In my opinion, the brake return design of the Model "A" is inadequate, so I added an auxiliary spring to help it work.
 

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Coyle,

I had to rotate my pedal to cross shaft rod 180 degrees rotation to get a better centering on the switch. Your button on the rod is supposed to be 1/16" from the rear, inner face of the cross member. If you don't have that set correctly, then the brake rod arms on the outsides of the frame are likely not vertical.
 
The plunger in the switch needs to be fully depressed to turn the switch off. With the brake pedal released, the mushroom on the back of the rod should be almost touching the inside wall of the center crossmember. If not, your service brake rods are most likely adjusted incorrectly as is the pedal rod.
 
Rob Doe said:
Your button on the rod is supposed to be 1/16" from the rear, inner face of the cross member. If you don't have that set correctly, then the brake rod arms on the outsides of the frame are likely not vertical.
Click to expand...

bobbader said:
The plunger in the switch needs to be fully depressed to turn the switch off. With the brake pedal released, the mushroom on the back of the rod should be almost touching the inside wall of the center crossmember. If not, your service brake rods are most likely adjusted incorrectly as is the pedal rod.
Click to expand...

I agree, you need to adjust the brake rods so the arms are vertical. This should bring the button/mushroom into the proper position to the switch.

I had to do this on my car to get the stop switch to operate properly.
 
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