Brake System Proportioning Valve

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flaresideone Associate Join Date: Nov 2009 Posts: 46	Brake System Proportioning Valve 12/30/2009 6:39 AM
	I am still redoing the brake system on 1948 ford F1, on the rear axel there is a small brass block that the rear brake lines and the main from the master cyl. tie into, I tried to remove it to clean or replace it and found a swivel cap on top of the unit, my question is as follows; is this a balancing valve? and how do you get it off once the hose and brake lines are removed? I know someone will say buy the manual, well not easy to come by still looking for one but ordered on line manual but hasn't arrived yet.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Brake System Proportioning Valve 12/30/2009 10:26 AM
	My totally uneducated guess is that it's just a junction block?
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pantaz Guru Join Date: Feb 2008 Location: Van Nuys, CA Posts: 563 Good Answers: 33	#2 Re: Brake System Proportioning Valve 12/30/2009 10:48 PM
	Post the question at hotrodders.com -- Lots of helpful car folks.
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Mr5 Participant Join Date: Dec 2009 Posts: 1 Good Answers: 1	#3 Re: Brake System Proportioning Valve 12/30/2009 11:18 PM
	FSO: The brass block you are looking at provides two functions: air vent for axle housing coupler for hard brake lines and flexible master line The cap is to prohibit dust from being "breathed" into the axle housing. Try un-threading the brass block after you have removed the lines. If memory serves, it has a nipple on the bottom to thread into the axle housing.
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Franksgarage Commentator Join Date: Jul 2009 Location: Northern CA Posts: 62 Good Answers: 5	#4 Re: Brake System Proportioning Valve 12/30/2009 11:52 PM
	I have a Ford where the rear end has a brake junction like you describe and the nut that holds it to the axle tube is hollow and serves as a vent for the rear differential, maybe that is what you see?
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Anonymous Poster	#5 Re: Brake System Proportioning Valve 12/31/2009 11:03 AM
	Yep, it is only a pipe junction and the axel breather.
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Anonymous Poster	#6 Re: Brake System Proportioning Valve 12/31/2009 2:25 PM
	Proportioning valves have a knob to adjust the pressure typically between the front brakes and the rear. I retro-fitted an older PU and put disk brakes on the front and drums on the rear. I used a proportioning valve in the rear brake line to adjust how hard the rear brakes come on. I used a 2 stage master cylinder, so the front brakes and rear brakes are fed from 2 separate reservoirs. I also used a brass block like you described to make a Tee to plumb the rear brakes.
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Anonymous Poster (2); Franksgarage (1); lyn (1); Mr5 (1); pantaz (1)

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