JeffTepper
Well-Known Member
I'm working on a '67 coupe and I am having difficulty getting the master cylinder pushrod to activate the brake light switch. I've already tested the switch for continuity and it is fine. I substituted a known good switch with no improvement. When I push the switch up at an angle so the master cylinder pushrod contacts the spring loaded plate in the brake light switch, the brake lights come on. Mechanically, it appears that under normal operation, when you press the brake pedal with your foot, the movement of the brake pedal forward causes the master cylinder push rod to slightly tilt relative to the brakelight switch and in so doing, the edge of the flat side of the push rod deflects the spring loaded plate in the brake light switch closing the circuit and sending power to the brake lights. It seems that the space between the master cylinder push rod and the brake light switch is too big. Anyone have any ideas?
Additional facts include:
4 wheel manual drum brakes;
plastic bushing for mounting brake light switch on brake pedal pin is there;
one of two plastic spacers on either side of the switch is there;
jumping the two wires at the brake light switch plug activates the brake lights.
TIA, Jeff
Update *********The solution was a different master cylinder puchrod with more meat on the back side (the flat surface that contacts the flat plate on the brake light switch). Makes me wonder how, or if, the brake lights worked previously!!!
Additional facts include:
4 wheel manual drum brakes;
plastic bushing for mounting brake light switch on brake pedal pin is there;
one of two plastic spacers on either side of the switch is there;
jumping the two wires at the brake light switch plug activates the brake lights.
TIA, Jeff
Update *********The solution was a different master cylinder puchrod with more meat on the back side (the flat surface that contacts the flat plate on the brake light switch). Makes me wonder how, or if, the brake lights worked previously!!!
