- Joined
- Feb 27, 2018
- Messages
- 193
For clarity, my '05 HD is the only one I've seen with DOT 5 specified. My '91 and my '07 both spec'd DOT 4. Only a guess, but it may have been tried for one or more years to get away from paint damage, fit and finish being so important to their owners. The company may have gone back to 4 due to inadvertent cross-contamination by their dealership mechanics. I found no detectable difference in brake performance after flushing the 4 and moving to the 5.