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Old 04-14-2002, 06:50 AM
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That's an interesting qustion by Phat, I don't really know but I'll take some guesses. The first thing it says in my Harley Davidson sevice manual is never use anything but denatured alcohol to clean system components, any normal mineral based cleaners are a definate no-no. Which I think means if you're switching over a DOT4 system to a DOT5 cleaning and replacing almost everything is critical. Any old chemial or cleaning agents in that system will cause trouble. That might explain why a new system built clean that never had anything but DOT5 in it would be less trouble. My bike is 11 years old with DOT5 fluid in it, so I know Harleys been using DOT5 for at least that long. One other observation I made is the reservoir covers on my bike are both screwed and sealed tight to the reservoirs. This might allow less air to penetrate the system. I think PAULWELDIT mentioned DOT5 absorbs air. The last thing you want on a 100hp two wheeler is bad brakes and all they use is DOT5. Go figure? <img src="confused.gif" border="0">