Re: [Chrysler300] use of brake proportioning valve

[retromobilia@xxxxxxxxxxx]

Just a couple of comments. First, the race car: I have built and rebuilt a road race car for the Mexican Road Race and what most misunderstood, a race car have two speeds, full on and full off. It is much easier to match everything for this and the proportioning valve adjuster is well suited to it, but requires constant adjustment. (It is called, but not actually, a Proportioning valve, but a restrictor to reduce flow to the intended part of the system. 
Think about the word proportioning and by definition. It is the the technique of routing the force to where it is needed (in proportion) to the force required. And in a street car the need is very varied. Therefore a true to the meaning (while the one being discussed adjusts the proportion of the amount of fluid that passes to the rear) the valve should re-direct the pressure from the rear to the front in proportion to the amount needed to each portion of the system. 
The block you see next to the dual master cylinder in most 1970's car does this and is engineered to match the brakes front and rear to the master cylinders. This is why it is one piece and shaped as it is containing a valve between the front and rear. 


If there is an automotive engineer out there who can explain this better than I, please respond. 


The bottom line is the brake system on our cars is the most necessary of all the systems (not excepting the steering or suspension) and is asked to do exceptional things at very unusual times. It should be certified and engineered properly before using. It is not like trying a different carburetor or sparking plugs. And when changed, should be tested in all modes. The dirt road is good, but a proper skid pad dry and then wet is best.....!!! 

J D Jung 
Retromobilia.net 

----- Original Message ----- 
From: "Tom Chvapil" <tchvapil@xxxxxxxxxxxxx> 
To: Chrysler300@xxxxxxxxxxxxxxx 
Sent: Thursday, October 14, 2010 3:58:02 PM 
Subject: [Chrysler300] use of brake proportioning valve 






Hope I don't get yelled at, but it is related to the proportioning valve. The only thing is, I have installed one on a 57 Jag last year, with front discs and rear drums, retaining the original MC. I don't see why it would be different for a 300..... 
I have used Wilwood valve, and even though it took a bit longer to install and route the new lines to it, it is placed under the steering wheel, out of sight, BUT within the driver's reach, for tweaking while driving. It took just seconds to optimize it, on dirt road. 

Tom Chvapil 
Tucson,Az 
tchvapil@xxxxxxxxxxxxx 




[Non-text portions of this message have been removed]



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