Dot5 Master to dot4
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Grand HDF Member
Joined: Sep 2010
Posts: 3,580
Likes: 215
From: Illinois
Dot5 Master to dot4
I have to get a new master cylinder.
Can I get a 9/16 master cylinder that is dot 5 and clean it out real good and put dot 4? 2009 street bobs run dot 4 so I thought it be easier to clean the master than all the lines. Will dot 4 ruin any seals of the dot 5 master?
Thanks for the help
Can I get a 9/16 master cylinder that is dot 5 and clean it out real good and put dot 4? 2009 street bobs run dot 4 so I thought it be easier to clean the master than all the lines. Will dot 4 ruin any seals of the dot 5 master?
Thanks for the help
Stellar HDF Member
Joined: Feb 2010
Posts: 3,403
Likes: 268
From: Southern California
Unless you're experiencing some really bad brake fade problems that are fluid (not pad) related I'd just leave it as is.
The only time I ever got an advantage from using DOT-5 was on a Showroom Stock SCCA race car that had to run the stock brake system; which was a great brake system on the street, but was a real handful after a few laps on a "real" race course even with DOT-5.
The only time I ever got an advantage from using DOT-5 was on a Showroom Stock SCCA race car that had to run the stock brake system; which was a great brake system on the street, but was a real handful after a few laps on a "real" race course even with DOT-5.
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Take the master cyl apart and clean all the components with methylated spirits, when dry, lube it all with the correct brake fluid and reassemble.....it will be fine.
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