brake bleeding question

europeandy

Im needing to bleed an avid juicy 3, the kit comes with a bottle of D0t 5.1, but I seem to remember the brakes are filled with Dot4.
Am I correct in thinking that I can use either, but not a mix?
Does bleeding with one completely purge the other from the system or do I have to drain and refill?
Oh and I think I might need to change stuck pistons on one of them but can only find a kit for juicy 5/7, are these compatible with 3's

Thanks

ali$tair

You can mix them but you will only get the performance of the lower rated one.

Havent a clue about the pistons.

bennett_346

ali$tair wrote:

You can mix them but you will only get the performance of the lower rated one.

Surely that would depend on the ratio of DOT 4:DOT 5.1 that ended up in the system?

butcher of bakersfield

Know naff all about bike brakes, but in cars, I'm not sure you can mix 4 and 5. You can however mix 3 and 4. I could be wrong...I'm sure there's a combination you're not supposed to mix. I just can't remember which.

nicklouse

butcher of bakersfield wrote:

Know naff all about bike brakes, but in cars, I'm not sure you can mix 4 and 5. You can however mix 3 and 4. I could be wrong...I'm sure there's a combination you're not supposed to mix. I just can't remember which.

correct you can not mix DOT4 and DOT5 but we are not talking about DOT5 we are talking about DOT5.1

DOT3/4/5.1 are all mixable. but as mentioned above the properties get changed.

PS some DOT4 can be higher spec that DOT5.1

europeandy

Ta peeps,
anyone any idea if the pistons are compatible?