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Message: <blockquote data-quote="bimmerman" data-source="post: 37578" data-attributes="member: 126">Originally posted by kctam@Dec 14 2004, 02:08 AM Bimmerman: Concur, stick to DOT4. DOT 5 (if not mistaken) is silicone based & this will definately screw up your ABS. Something to do with little / no lubrication for the ABS pump (???) Unless you're doing lots of heavy braking (ala track), then DOT 4 in most cases, would be more than sufficient to meet your needs.Also, if your can of DOT 4 is older than 1 yr old, best to use new bottle of DOT 4. That's because brake fluid is hygroscopic (ie. attaracts moisture) & after being left "unseal" for 1 yr, the moisture absorbed would have reuced it's performance.If you want better performance for track, then just replace & flush the pipes just before track day. Hope have been of use to you.  Thanks for the great advise brudder! My Dot 4 is new and still sealed. Bought for my Nissans for topping up. Track use? I wish! My 520 would be a real laughing stock on any track. Everything stock standard. Always kena bullied by Perdana on highway. Shy only lah.So does this mean that bimmers modified for racing must upgrade to a different type of ABS in order to use Dot 5?</blockquote>