Proportioning valve question

[lolife99]

Drum brake trucks have a distribution block.
The 71-87 disc brake trucks have a proportion valve.
Just add the brake booster to your current M/C.
Done.

[Gregski]

Originally Posted by lolife99

Drum brake trucks have a distribution block.
The 71-87 disc brake trucks have a proportion valve.
Just add the brake booster to your current M/C.
Done.

Thanks, do the 71-87 trucks with proportioning valves still run the brown wire to the brake idiot light in the gauge cluster and the proportioning valve?

I have a basket case '71 GMC (it's a '71 cab on a '69 chassis) hence my question

[hjewell2]

Originally Posted by lolife99

drum brake trucks have a distribution block.
The 71-87 disc brake trucks have a proportion valve.
Just add the brake booster to your current m/c.
Done.

bingo