kosugesan Posted July 22, 2014 Share Posted July 22, 2014 Hey, I've been reading that many people have been using Dot 4 brake fluid in our cars. The cap says Dot 3 only, but I've been reading some threads and many have recommended ATE dot 4 fluid. What are the benefits of going to Dot 4 vs Dot 3? Is it safe to replace to Dot 4 with stock brake lines? Thanks for any info! Link to comment Share on other sites More sharing options...
Drift Motion Posted July 22, 2014 Share Posted July 22, 2014 DOT 4 should have higher boiling point temperature than DOT 3 Link to comment Share on other sites More sharing options...
kosugesan Posted July 22, 2014 Author Share Posted July 22, 2014 So safe to use despite the brake fluid cap stating Dot 3 only? Thanks. Link to comment Share on other sites More sharing options...
amptramp Posted July 22, 2014 Share Posted July 22, 2014 DOT4 starts off with a higher boiling point but water absorption decreases the boiling point much faster than DOT3 and it cannot hold as much water. If you use DOT4, you should be prepared to replace brake fluid frequently as a regular maintenance item. If you prefer set and forget care, use DOT3. Link to comment Share on other sites More sharing options...
FknBoss Posted July 22, 2014 Share Posted July 22, 2014 Only difference is boiling point. You can go up in number but not down as long as you use actual brake fluid. If it's a silicone race fluid the system needs to be flushed you can't mix. I use dot4 in everything Link to comment Share on other sites More sharing options...
kosugesan Posted July 30, 2014 Author Share Posted July 30, 2014 thanks!! went with dot4. Does that mean if i want to bleed my clutch, i have to go with dot4 for clutch fluid too? Thanks for all the help! Link to comment Share on other sites More sharing options...
FknBoss Posted July 30, 2014 Share Posted July 30, 2014 I would stick with dot 4 I wouldn't mix even tho they can be mixed but will lower boiling point. Link to comment Share on other sites More sharing options...
BrianEarlSpilner Posted July 30, 2014 Share Posted July 30, 2014 Just put dot 4 in yesterday. Pedal feels nice and firm. Like they said, just don't mix them. Do a full flush. You will have to do it more often but only once a year under normal driving. It gives you a chance to get a close look at your brakes anyway so that can't hurt. Otherwise read here http://www.lelandwest.com/brake-flui...ison-chart.cfm Link to comment Share on other sites More sharing options...
FknBoss Posted July 30, 2014 Share Posted July 30, 2014 Your supposed to do it every year or 15k but I e seen dot 3 and dot 4 in for 100k before we flushed it. Link to comment Share on other sites More sharing options...
kosugesan Posted July 31, 2014 Author Share Posted July 31, 2014 awesome, thanks guys Link to comment Share on other sites More sharing options...
boxman Posted August 1, 2014 Share Posted August 1, 2014 thanks!! went with dot4. Does that mean if i want to bleed my clutch, i have to go with dot4 for clutch fluid too? Thanks for all the help! Clutch hydraulics and brake hydraulics are separate systems...unless I've missed something along the way... Link to comment Share on other sites More sharing options...
FknBoss Posted August 1, 2014 Share Posted August 1, 2014 They are. Still uses brake fluid tho. And op flush the clutch system with dot4 also.. Link to comment Share on other sites More sharing options...
boxman Posted August 1, 2014 Share Posted August 1, 2014 Yeah, I know that they use brake fluid in clutch systems, I guess I missed the part where he flushed the clutch...or just flat out misunderstood the question... Link to comment Share on other sites More sharing options...
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