Yesterday the brake pedal started to make a loud clunk when returning to the rest position, on my '55 2nd 3100 pickup. Then I noticed that the brake lights were on all the time. I see that the actuation arm on the brake light switch is missing now. Is there something other than the switch actuation arm that stops the brake pedal arm in its travel back up to the firewall? I have a new Standard parts switch on the way from Rock Auto.