norvalwilhelm
Well-known member
I did this last night for a friend. I took my old lightswitch/proportioning valve, sand blasted it and took it apart.
I wanted to make a bypass , internally so all stocl lines could be used and the installation would look stock.
After cleaning the brass block I removed the light switch and the screwed on end.
Inside the large brass block is a rubber plunger. Grab this with need nose plies and it would pull out a complete assembley. Discard this assembly.
Use a 3/8th npt tap and run it in the existing hole and tap the hole until the pipe tap almost disappears. Use dry seal which is a small plug with pipe threads and an Allen wrench. This once installed blocks off the front from the back brakes making them 2 seperate units.
The other piece you unscrewed from the end, the large brass nut has an internal part to it.
Carefully put the end with the O ring in the vise being carefull to minimize damge and this section with the O ring slides out revealling a large spring and another device, remove this device and disgard.
In the side of this brass plug is a rubber blow off cap, this is a leak to the outside, remove this rubber plug and drill a NUMBER 4 hole or the proper hole for a 1/16 the NPT tap and tap this hole for a very small dry seal. Again a NPT plug that uses an Allen wrench to install.
Plug this drain hole.
NOw gentley press the brass plug with the O ring that you pulled out back in it's stock location.
The only thing left is the light switch, cut of grind the subt sticking down off, this when the brakes fail out have been pushed up turning on the warning light.
Grind it off and reinstall.
The block is now ready to reinstall on the car effectivly seperating the 2 systems, at the same time looking stock and using the stock lines.
Good luck
I wanted to make a bypass , internally so all stocl lines could be used and the installation would look stock.
After cleaning the brass block I removed the light switch and the screwed on end.
Inside the large brass block is a rubber plunger. Grab this with need nose plies and it would pull out a complete assembley. Discard this assembly.
Use a 3/8th npt tap and run it in the existing hole and tap the hole until the pipe tap almost disappears. Use dry seal which is a small plug with pipe threads and an Allen wrench. This once installed blocks off the front from the back brakes making them 2 seperate units.
The other piece you unscrewed from the end, the large brass nut has an internal part to it.
Carefully put the end with the O ring in the vise being carefull to minimize damge and this section with the O ring slides out revealling a large spring and another device, remove this device and disgard.
In the side of this brass plug is a rubber blow off cap, this is a leak to the outside, remove this rubber plug and drill a NUMBER 4 hole or the proper hole for a 1/16 the NPT tap and tap this hole for a very small dry seal. Again a NPT plug that uses an Allen wrench to install.
Plug this drain hole.
NOw gentley press the brass plug with the O ring that you pulled out back in it's stock location.
The only thing left is the light switch, cut of grind the subt sticking down off, this when the brakes fail out have been pushed up turning on the warning light.
Grind it off and reinstall.
The block is now ready to reinstall on the car effectivly seperating the 2 systems, at the same time looking stock and using the stock lines.
Good luck
