Lichid frana dot 5.1

[mironb 61]

Stie cineva, e vreo problema daca bag lichid de frana dot 5.1 in loc de dot 4? Se strica garniturile sau ceva?

[Matrixxx 1,425]

sint o gramada de info...

- DOT 5 doesn't absorb water like DOT 3 and 4 do, which is intentional so that steel brake lines don't rust. DOT 5 is okay in race cars because they change fluid every race. Possibly not an issue in bike brakes, since there's no steel.

- New/clean DOT 5 may have a higher boiling point than DOT 4, but water droplets in the caliper still boil and turn to steam = spongy brakes.

- Clean DOT 5 is more compressable than clean DOT 4, which means brake feel will be LESS firm. (clean DOT 5 may feel the same as old/wet DOT 4 though, depending on how much water is in it)

- Prior to changing to DOT 5, the entire hydraulic system MUST be flushed with alcohol and all DOT 3/4 glycol-based fluid removed. If any DOT 3/4 remains, it will react with the DOT 5 and turn to some kind of gel. When this happens in cars they sometimes have to trash the whole brake system and start over. (may be possible to disassemble and clean the calipers, but the lines are junk)

Bottom line: unless DOT 5 is recommended by the brake manufacturer and comes with it new, just run the highest boiling point glycol-based fluid you can find. It's cheap and it'll perform better - and all you have to do is change it once a year or so.

[mironb 61]

Ok, mersi frumos Matrixxx, o sa raman la dot 4.