Harry Flatters Posted April 8, 2002 Share Posted April 8, 2002 HELP! - I'm in the middle of bleeding my new big brakes and have run out of Comma Dot 4 fluid - bad planning - I know!. My local supplier has gone to the wall so (a) what other dot 4 can I use or (b) can I mix it with dot 5.1? Steve Mell PTM 88 Link to comment Share on other sites More sharing options...
Fred Posted April 8, 2002 Share Posted April 8, 2002 yes you can fredid=blue> smile.gif Link to comment Share on other sites More sharing options...
Harry Flatters Posted April 8, 2002 Author Share Posted April 8, 2002 Why is dot 5.1 better than dot 4 and can you mix manufacturers? Steve Mell PTM 88 Link to comment Share on other sites More sharing options...
EFA Posted April 8, 2002 Share Posted April 8, 2002 As a general rule the higher the DOT rating, the greater the boiling point of the fluid. The lower the dot rating, the less hygroscopic the fluid is. Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Peter Carmichael Posted April 8, 2002 Share Posted April 8, 2002 The lower the DOT number the earlier the date of the specification it is meeting. DOT 3,4 and 5.1 can be mixed. Part of the DOT specification concerns miscibility. DOT 5.1 is pretty good from a hydroscopic point of view (i.e. it doesn't do too much of it) Link to comment Share on other sites More sharing options...
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