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Old 01-21-2007, 05:52 PM   #1
infidel
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dot5 fluid in a dot 4 system?

will this cause any problems?
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Old 01-21-2007, 05:55 PM   #2
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I believe DOT3 and DOT4 are interchangeable but DOT5 is not. I'm sure someone a little more knowledgeable will chime in soon. Why not just use DOT4?
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Old 01-21-2007, 05:58 PM   #3
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i was told to use his fluid its this purple racing and i was given too me but it seems when the brakes get warm the fluid expands causing the brakes to stay engaged...i wanted to know if it was the fluid or maybe something else

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Old 01-21-2007, 07:38 PM   #4
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Dot 4, like dot three is a Water saluble oil base fluid.
Dot 5 is a silicon based fluid.
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Old 01-21-2007, 07:39 PM   #5
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If you replace DOT 4 with DOT 5.1 I think you'll be fine (I did this & no problems).

DOT 5 is silicone based. I don't think you cant replace DOT 4 with DOT 5 without completely cleaning out the lines.
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Old 01-21-2007, 07:49 PM   #6
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I am not sure of the dot 5 now but when I was racing cars if you put dot 5 in a dot 3 4 system you had to change all of the seals and O-rings. I had a couple of very exciting Laps of road Atlanta because of that. If you add 4 to 3 then both are 3. Dot 5 may shrink seals.
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Old 01-22-2007, 03:47 AM   #7
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DOT 5 is not compatible with DOT 4.

If you're looking for a higher boiling point, swap over to Motul RBF. It's still a DOT 4 but has a boiling point of 594 degrees, almost twice that of conventional DOT 4 fluid.
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Old 01-22-2007, 03:50 AM   #8
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yea the dot5 suck ....does it expand in a dot4 system when it gets hot?
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Old 01-22-2007, 03:54 AM   #9
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No, it reacts with the DOT 4 and starts becoming like a gel.
Did you mix the 2?
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Old 01-22-2007, 03:56 AM   #10
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no i flushed it... it was making my brakes tighter and tighter the more i used the brakes and then they just locked up and i had to pull over and then i was fine for a bit and then they locked up again and i wrecked:(
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Old 01-22-2007, 04:03 AM   #11
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Sounds like your master cylinder isn't allowing the fluid to return.
Could be a blocked port or something as simple as a bent lever.
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Old 01-22-2007, 04:05 AM   #12
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had a new lever on it can it be air? i had problem bleeding the system but i swore i got it all out maybe i didn't new lever now i need another
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Old 01-22-2007, 04:08 AM   #13
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New lever could be incorrectly installed OR if it's an aftermarket one, it might not fit correctly.
I only like the Motion Pro replacement levers, a lot of the other brands sometimes won't fit properly.
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Old 01-22-2007, 04:10 AM   #14
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it was a motion pro brakes work fine before i flushed it ... i dunno im scared to ride it anywhere till i figure it out and ill let you look at it to makke sure.
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Old 01-22-2007, 04:12 AM   #15
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O.K., bring it by when we reopen Tuesday and I'll give it a look.
In the meantime check to make sure the lever is returning all the way and the master cylinder piston is not being hung up.
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Old 01-22-2007, 04:13 AM   #16
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allright im there ....i dunt have a cage so ill try to see if i can get it to work and ill still bring it by...
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Old 01-24-2007, 12:21 PM   #17
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I also recommend Motul RBF 600 DOT 4 brake fluid.

With the bike in the stands, does the front wheel spin freely after you pull the brake lever and let it go?
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Old 01-24-2007, 12:37 PM   #18
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DOT 5 IS BAD!!!!!

Read the fine print. It can only go into a brake system that has NEVER contained dot 3 or 4 fluid. That doesn't mean you can simply flush out the old fluid & you'll be oK. Either buy a brand new brake system or leave dot 5 alone.
I made this mistake on my race bike about this time last year & missed the whole 06 season because of my injuries. My front brakes simply locked at around 100mph sending me & the bike cartwheeling.
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Old 01-24-2007, 01:58 PM   #19
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Quote:
Originally Posted by mammothmc
DOT 5 IS BAD!!!!!

Read the fine print. It can only go into a brake system that has NEVER contained dot 3 or 4 fluid. That doesn't mean you can simply flush out the old fluid & you'll be oK. Either buy a brand new brake system or leave dot 5 alone.
I made this mistake on my race bike about this time last year & missed the whole 06 season because of my injuries. My front brakes simply locked at around 100mph sending me & the bike cartwheeling.
mine locked up too i just flushed my system and went back to dot 4
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Old 01-24-2007, 02:01 PM   #20
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Quote:
Originally Posted by mammothmc
DOT 5 IS BAD!!!!!

Read the fine print. It can only go into a brake system that has NEVER contained dot 3 or 4 fluid. That doesn't mean you can simply flush out the old fluid & you'll be oK. Either buy a brand new brake system or leave dot 5 alone.
I made this mistake on my race bike about this time last year & missed the whole 06 season because of my injuries. My front brakes simply locked at around 100mph sending me & the bike cartwheeling.

hmm that sounds like something i remember happening..
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