Halp! I did an oops.

[CHRIS67]

I put in silicone DOT IV fluid when I converted my drums to disc thinking that would be better. The manufacturer says I should have used DOT III. What can happen? Do I need to gravity bleed in dot III?

[CHRIS67]

The manufacturer says that it silicone is hard on the seals, but I need to keep using the DOT IV otherwise I need to replace the master and calipers. Does that sound correct? Anyone have any experience with this happening to them?

[91chevywt]

If you used DOT IV with DOT III you should be fine, they are commonly interchangable. They are both Glycol based. DOT V is the silicone based fluid. If you used DOT V I am pretty sure that is not interchangable.

The only difference between DOT III and IV is temperature rating, with IV being able to withstand greater temperatures.

[B4C]

DOT III and DOT IV are interchangable, DOT V and higher does not interchange.

[ib4200]

i always thought as long as the rating was higher it was ok, ie IV works with III but you cant use III in something rated for IV

[B4C]

^^^^nope heres why.

Originally Posted by 91chevywt

If you used DOT IV with DOT III you should be fine, they are commonly interchangable. They are both Glycol based. DOT V is the silicone based fluid. If you used DOT V I am pretty sure that is not interchangable.

The only difference between DOT III and IV is temperature rating, with IV being able to withstand greater temperatures.

[WildBillyT]

You sure you used DOT 5?