It is possible they designed the stainless lines with the extra length just in case someone had replaced or was planning to replace the original proportioning valve with an aftermarket one.
Disk/Disk proportioning valve
- Thread starter 87 Grey T
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I'm not sure exactly what proportion the factory built in to their valves, but I figure they based the specs on the weight of the car, engine power, and handling. That said, I figure an F body is roughly the same weight as our cars, and we usually upgrade the power factor to a V-8, and add stiffer handling suspensions and tires, so logically the F body combination valve is a simple swap-in as long as the fittings match. An adjustable valve is a great thing, IF you are willing to go through all the testing to get it exactly right. My buddy used one with 4 wheel discs on a '68 Firebird and he regularly changed the adjustment for rainy days, but he thoroughly thrashed it beforehand so he knew what he was doing. I have a '77 Firebird with 4 wheel discs and I specifically searched out the factory combo valve- it's just what the doctor ordered- works great.
Well i bolted in the new one on Fri. install was easy(except for workin around the long tubes). Fit was perfect, lines threaded right in. Looked great before it got covered up by the linkage bracket. Still have to bleed them, and finish torqueing down the front susp. then ill take it for a ride, so i didnt get to test it out yet. Regular DOT 3 fluid should be ok?
you can mix the dot 3 with 4 and 5.1 but not 5. DOT 5 is silicone base, the others are glycol based. If you are wondering what they mean by dry and wet...
"The Dry Boiling Point of brake fluid refers to the boiling temperature of fresh, new brake fluid from an unopened container. Whereas the Wet Boiling Point is defined as the temperature DOT brake fluid will begin to boil after it has absorbed 3.7% water by volume. DOT brake fluid will reach this level of water volume after roughly 2 years of service, which is why it is advisable to renew your brake fluid every 1-2 years."
"The Dry Boiling Point of brake fluid refers to the boiling temperature of fresh, new brake fluid from an unopened container. Whereas the Wet Boiling Point is defined as the temperature DOT brake fluid will begin to boil after it has absorbed 3.7% water by volume. DOT brake fluid will reach this level of water volume after roughly 2 years of service, which is why it is advisable to renew your brake fluid every 1-2 years."
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I have used Castrol GT LMA DOT-4 for many years and it is very good stuff. But if your car is going to sit a lot I would consider switching to DOT-5 silicone as it won't absorb moisture. Take it from me, the years pass by fast and before you know it, your brake fluid is old. Read this-http://www.mossmotors.com/SiteGraphics/Pages/brake_fluid/page1.html
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