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Home » Public Forums » GMCnet » Problem with brass body proportioning valve (Read about it in Winter 2021 Vintage RVing)
Re: Problem with brass body proportioning valve [message #365387 is a reply to message #365293] Mon, 12 July 2021 17:12 Go to previous messageGo to previous message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma:
Senior Member
Greg, consensus is that there was no proportioning from the factory. At this point in time the best bet is to do the simple mod on the GM brass valve to have it basically same as factory but in brass. As reported here and in the article and on the instruction sheet .pdf it’s s simple mod.
Here is a simple analogy to the self energizing effect of drum brakes, and why proportioning is almost always needed with disc/drum (but not on TZE due to weight, length, heavy Onan, propane, water weight aft of rear ‘axle’ ) Imagine walking down a gravel road and holding a shovel handle at your side allowing the shovel to drag behind you at 45 deg. . It creates very little friction. Now do the same but have the shovel at 45 deg in front of you. Yes it digs in much like the forward shoe is pulled against the rotating drum on drum brakes. This is actually a free benefit that discs do not have.


John Lebetski
Woodstock, IL
77 Eleganza II
 
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