S-10 Blazer prop valve

[canadian_diesel1964]

Hey guys I'm moving on and wondered about this prop valve off the S10 blazer brake set up...as a rule of thumb the larger diameter set up is for the rear brakes right? So that's the exit on the left...just confirming...it seems the PO REMOVED THE 1/4 line in the rear and replaced with 3/16...so now when I'm done the only 1/4" line left on the truck after the disc brake conversion will be the line between the 2 tees that feed the front brakes...the hoses hook to that and they are 3/16 as well...I should be ok eh? Thanx for any help...