going to dot3 from dot5

[kellen]

So my new (old) race bike has dot5 in it. Whats the best (EASIEST) way to go about flushing and cleaning all the old fluid out before adding the new dot3? It's a 99 R6

[fastar1]

I believe you have to rebuild the calipers because they need to be cleaned right out, and replace the lines.

[kellen]

Well ain't that a *****. i'm not really down with that.

[jay-d]

Yea.. something like Dot 3/4 don't mix with Dot 5, but you can mix with Dot 5.1.

Like oil and water!

[kellen]

yeah maybe it's just easier to clean out the new master and keep using dot 5

[Fiery254]

Without sounding a smarty pants I really would refer to the manufacturers websites. If they don't give an answer then get in contact with their tech support. Brakes aren'ty something we want to be second guessing about.

I recently started using 5.1, although I was rebuilding my calipers and installing a new master, new reservoir and fitting new braided lines at the same time so really didn't have to worry.

[jay-d]

So I got a little curious and did some research. This part stood out to me.

Dot 3 being glycol
Dot 5 being silicone

"On the practical side, beware that glycol and silicone brake fluids are hugely incompatible with each other. Mixing even small amounts will create a sludge that looks amazingly like Italian salad dressing and is about as effective as a brake fluid -- meaning, not. Of further consideration is that, in some cases, the hardware designed for one fluid will not accept the other. Brake caliper and master cylinder seals, hoses, and other parts won't always work correctly when the type of fluid is changed."

Source: http://www.motorcycleproject.com/mot...rakefluid.html

[kellen]

Brembo master i want to install was used with a dot 3 system.

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[RockerGuy]

Brembo master i want to install was used with a dot 3 system.

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U should switch to Dot 4 if u are switching. It has a higher boiling point. Dot 3 is old tech.

U can mix dot 3 & 4. Just flush it, not a complete mix

[backmarkerducati]

Brembo master i want to install was used with a dot 3 system.

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See that is the kicker, the master you want to use was used with DOT3, but caliper and lines you want to put it on were used with DOT5... So either you are converting the calipers and lines or you are converting the master... either way...

Easiest path to me is just don't switch the master (is your's dead)?

[TwistedKestrel]

Brembo master i want to install was used with a dot 3 system.

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Johnny seems pretty familiar with Brembo stuff, maybe you could get him to rebuild it.

[JohnnyP636]

Johnny seems pretty familiar with Brembo stuff, maybe you could get him to rebuild it.

Brembo does not sell any internal parts for those masters. They want you to send them back to Italy for any internal rebuilding...You could open it and clean it but thats about it, and its really not necessary

All he has to do is flush out the fluid when he bleeds with the new fluid...Its not like the 2 fluids will cause an explosion...They only cause problems when you try to mix them and use them together...

[TwistedKestrel]

Brembo does not sell any internal parts for those masters. They want you to send them back to Italy for any internal rebuilding...You could open it and clean it but thats about it, and its really not necessary

All he has to do is flush out the fluid when he bleeds with the new fluid...Its not like the 2 fluids will cause an explosion...They only cause problems when you try to mix them and use them together...

^ This advice supersedes any suggestions I have made in this this thread

[sircastic]

Brembo does not sell any internal parts for those masters. They want you to send them back to Italy for any internal rebuilding...You could open it and clean it but thats about it, and its really not necessary

All he has to do is flush out the fluid when he bleeds with the new fluid...Its not like the 2 fluids will cause an explosion...They only cause problems when you try to mix them and use them together...

Agreed, I would actually take it one step further and flush with methyl hydrate between fluids. Open the bleeders, let the old fluid run out, let gravity run the methyl hydrate through and then use the new fluid. I used to rebuild a lot of calipers and mater cylinders when I worked as a mechanic and methyl hydrate was the best way to clean and remove moisture. It won't damage any of the rubber components and evaporates easily.

[Serialize]

Brembo does not sell any internal parts for those masters. They want you to send them back to Italy for any internal rebuilding...You could open it and clean it but thats about it, and its really not necessary

All he has to do is flush out the fluid when he bleeds with the new fluid...Its not like the 2 fluids will cause an explosion...They only cause problems when you try to mix them and use them together...

Hi Johnny, question about the brembo.
I was wokring on a bike and was told had dot4 in the system. Turns out it looked like motul dot 4 in the resevoir becuase bronze in colour, but sure enough when i started to bleed the lines totally clear solution came out that I almost thought was water at first. But then the salad dressing started. Looks like they topped up with dot4 but had dot5 (not the 5.1) in the system. I don't know if the mix they had up in the resevoir was used on the track riding and actually had heat in it under full braking temps, but once I started the bleed it sucked it into the silicone fully and the bad mix was all throughout the system at this point.
So, it has a shinny new-ish brembo 19x20 (probably half a season on it) and all the reading and research I've done online indicates that brembos cannot but be reuiblt and the seals will swell from the silicone. The crash repair kit only fixed the parts in the kit but not the internal seals. So I'm concerned about using the system if there will be internal swelling and distortion. In the mean time what i did was disassemble the entire brake system and cleaned the lines with brake cleaner, I'm going to have to buy the caliper rebuild kit and work on that, but most importantly this bloody brembo that i wanted to try so badly (never had one before) I'm wondering will it work again? I cleaned the brembo out also with brake cleaner and also filled up a small container with rubbng alcohol and let it soak in there since this morning hoping to dissolve the silicone and save the seals.

Any suggestions ? Is there hope ?

Thanks for the info.

[fastar1]

So my new (old) race bike has dot5 in it. Whats the best (EASIEST) way to go about flushing and cleaning all the old fluid out before adding the new dot3? It's a 99 R6

You could just buy all new parts. Not cheap, but EASY

[frekeyguy]

It takes 20mins to rebuild those calipers and an hour or do to get that master to work with the calipers.

If you need a hand, just ask

[kellen]

Thanks Johnny and Simon...that's will I'm going to do!