Dot 5 is slightly compressable because of the air that gets entrapped in the fluid. On some cars it becomes an issue because of limited brake pedal travel. On other cars the brakes have a lot of hoses and the pedal is already spongy (like Deloreans). My recomnedation for those considering converting to DOT 5 would be to replace the 4 hoses with the braided metal ones. BTW you are not supposed to just drain the old fluid out and dump the DOT 5 in. To do it properly you are supposed to disassemble the system, flush with alcohol, and replace the seals. Something best done at the time you rebuild a brake system. Water is not dissolvable on DOT 5. If you do get moisture in it it balls up, goes to the lowest point and rots the insides. It is best used on a system that is COMPLETLY cleaned and there is NO water present. It has become a very attractive alternative on many older cars but you CANNOT mix it with any other fluid. You should replace the sticker on the car with another saying to ONLY USE DOT 5. I do not know how the rubber compounds used in the seals will react long-term and if you will have to flush every 2 years or not. As good as DOT 5 is it doesn't seem too popular among the users of British cars. BTW DOT 5 has a MUCH higher boiling point than DOT 4 so it should be a much better fluid for any braking system. It does not absorb moisture and that is what lowers the boiling point on other brake fluids. Keep it away from anyplace you plan to do painting. Silicone contamination is very insidious and difficult to get rid of. On the plus side if you have a brake leak it won't melt the paint! David Teitelbaum vin 10757 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/