How to reset brake pressure warning switch? Options

[andreic]

I have a 1972 914 1.7L with the original master cylinder. After a lot of adventures with the brakes two years ago I replaced the front calipers and the brakes have been working great since then.

However about a year ago I noticed an intermittent clicking of one of the relays, like the one for the turn signals, just less frequent and less regular. It might click every few seconds. No light comes on the dash.

After a lot of diagnosing I traced it down to the brake pressure warning switch on the master cylinder. If I disconnect the line going to the switch, the clicking stops. My guess is that somehow the switch was left over in some intermediate stage where it is neither on (when it would turn the red warning light and blink vigorously) or off.

At the time I tried to clean off the gunk around it and to reset it. The cleaning seemed to help (it stopped clicking for a few months, but now it's come back) but I cannot for the life of me figure out what needs to be done to reset it. There is a little black button-like thing, between two copper vertical bars. There does not seem to be a way to push the button in any more.

Any suggestions short of replacing the switch? I don't want to have to deal with the hassle of needing to bleed all four brakes all over, etc.

Thanks.

[bdstone914]

Use a small wood dowel as a punch and tap on it. It should be flush with the switch surface.