Water will get in it when it does it puddles in one spot that spot will rust. It can not stand up to heat under the hood well. I have seen it expand and cause the brakes to drag. In a clutch hydraulic system I have seen it heat up and cause the clutch to slip.
I had a issue with a 67 442 the guy had replaced all the lines with SS and went with SS lined brake calipers along with Dot 5. The calipers had a lifetime warranty and were leaking when taken apart all of them had bad pitted calipers. The manufacture rejected the warranty and stated dot 5 was the root cause. They said go back and read the warranty the use of dot 5 will void the warranty.
You could see were one drop of water in one place in the calipers started eating away at the liners. If you use dot 5 you still need to flush it every 2/3 years just like you should do with dot 3.
The problem I have seen with dot 3 is there is so many cheap brands out there that are not compatible with the rubber parts in the system. I use name brand dot 4 and never had a issue with it.
American manufactures are catching on to adding brake fluid flushes in there maintenance schedule, its been the norm for European and most Asian manufacturers to recommend the fluid be serviced.
The next problem is the black chit were does it come from. Its a reaction with something in the system.
If you want to see a real mess get a hold of a system were dot 3 and 5 have been mixed :shock: I did the maintenance for the local USPS for 20 years, They used dot 5 I never seen the benefit in fact I thought it made it worst. They put a big dot 5 sticker on the top of the lid on the master do you think a normal guy knows what that meant :lol:
You guys with chebby pick ups that have rear disc brakes with aluminum calipers, calipers are in your future just wait till you see that black mess that comes out of them. Once you get it replacing the calipers and a good flush is the only answer.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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