Quote:
Originally Posted by K10-Kansas
Thanks, I downloaded the wiring diagram from American Auto Wire and searched the word brake and found it. It was an add on for the bulkhead so I added it on and connected it up. Thanks. I guess I should crawl all over this truck and look for other random non-connected things.  |
You can test your brake warning circuit by bleeding the front brake while ignition key is in the on position. When you press the brake pedal and some fluid comes out of the caliper bleeder, the light should come on. Close the bleeder and repeat test with rear brake bleeder open. Reset the valve and light if you need to between tests or after tests, by pressing on the brake firmly with bleeders closed. The 71 and 72 service manuals have this procedure for testing the warning light switch, I've given a much abbreviated version. The manuals:
https://67-72chevytrucks.com/vboard/...d.php?t=558016
If you should need work on that combination valve, I have sent mine to
White Post Restorations and had good results from them. I recommend don't change it out with some Chinese junk new replacement proportioning valve.
If you ever desire to move that valve to be up by the master cylinder, the
metal bracket that mounts it there is reproduced.