I messed up! I bought a set of chrome controls (drag) part number 0610-0532

I thought my old master said dot 4 but it really said dot 5, So i installed the new master (drag part) and the cover on it said to use dot 4. which i filled with dot 4. I only took the line off the old master and attached it to the new and filled it up.

So i'm sure there is no dot 4 down to the calipers. Can I just take the master off and clean it and flush the lines to the calipers with 5 by unhooking them. What concerns me is the new master says dot 4 , can 5 be used in it?

 

You need to flush thru completely with a couple bottles of 5..Just my opinion.

 

Do you think its OK to run DOT5 in a master labeled as DOT4

 

I've heard denatured alcohol works well as a flush when going from 4 to 5.

 

Should be fine.

 

Thats good to hear, Guess its time for some braided front brake lines. and flush the new master good...

 

Seriously. Flush it, run 4. Cheaper and you will never realize the benefits of 5 on your Harley, that's why they went back to 4.

 

Sure, because DOT 4 is a much better paint remover than 5.

 

Why they went to DOT 4 across the line of bikes was because some got ABS a few years ago and it requires DOT 4 since ABS was designed around the automotive system and DOT 4 is used.

DOT 4 sucks big time in the front master cylinder when the bars are over the tank if a problem in the system should occur.

There is a difference in the rubber in the two system and if you got a DOT 4 master, you should get the proper one.

 

As long as you are the only person who services the bike.

I`ve been using DOT 4 in my `89 Softail for at least 20 years.