This issue had been bugging me for some time and after posting on the forum and getting mixed opinions thought a parallel approach was the way to go.

The issue is to do with a new pressure switch failing slowly and requiring more and more foot pressure on the brakes before the brake lights show - a situation that was becoming more dangerous as it continues.

Someone was going to rear-end me eventually.

Decided to do away with the pressure switch on the hydraulic line and put a simple push switch on the pedal. Saw a example of one on the pedal in the footwell but decided to try and do one on the pedal box in the engine bay.

As it turns out some later cars have this system. The manual showed a schematic that indicated I should be able to drill a hole and weld a nut onto the pedal box to be activated by the pedal arm directly behind the master cylinder.

I called into Repco and after a bit of explaining about what I was trying to do they gave me a choice of 2 switches from an early Commodore and I chose the one which had a metal body. It was longer than it needed to be but the thread went all the way so I was happy that I would be able to adapt it somehow.

These photos pretty well show the sequence of events even though I forgot to take some during the fabricating and welding stages.

Picture before modification.

Whoops, didn't plan that.
Bought the switch first and it's too big to put where I want to.

Still too big.
With the cover off it's obvious that it won't fit here.

Maybe...
If I can mount it like this it will work.

Where to drill?
How do I determine where to drill?

Is this pointing to the spot?
Set up a line to hit the pedal at the right angle.

Those little magnets come in handy
Line up the top edge of the rule to hit the right spot.

Looks good
"Lookin' down the barrell"

'X' Marks the spot
Put the cover back and sight down the rule.

Looks about right
Mark the spot with a cross

Now where's my drill
Set up to drill 10mm

Checked and painted
Welded the nut in place checked to make sure it worked, (Forget to take photos) and paint

Finished modification
Works a treat! Best thing is that no wiring modification is required.

Another view. You can see the old switch down below. I just left it there disconnected.

Brake lights come on now when I touch the brake pedal. I can show brake lights without applying the brakes if I want to now.