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**lolife99** · 11-09-2017, 09:13 AM

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.

11-09-2017, 09:13 AM	#6
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: Proportioning valve question 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. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823