Tom A. wrote:
durk onion wrote:
Don't you need different types of seals for mineral oil vs. DOT fluid? At least that's the argument I've always seen against just swapping fluids.
Your idea would still work, you just need two plates solidly connected with two different seals.
Possibly...like I said earlier, I'm just brainstorming "out loud"...
It would not be a crazy solution. It could be used to to address different brake levers using different fluids and also address if the brake levers are based on using a different amount of fluid exchange (equivalent to different cable pull ratios).
One issue will still be that there will be some fluid that leaks across the seals, so the fluids will mix (probably more from the fluid from the brake lever side to the brake caliper side since it will probably be higher pressure momentarily compared the fluid on the brake caliper side). This is because dynamic seals either leak or burn up. I would assume they would not want the seals to burn up, since this will be latent failure (the brakes will still work until the seals on the caliper piston are destroyed by the fluid and you have no indication until then).
Second would be additional friction. I do not know if this will be an issue, but leakier seals will have less.
Bleeding could be done on the brake lever side with a bleed valve at the brake lever that appears standard. Then this adapter could have an integrated bleed valve to bleed the run to the caliper, since this adapter is probably going to be higher than the caliper.
Then you have the other concerns like needing to have two different types of fluids around. Also more packaging concerns. And more complicated bleeding.
It is probably the best solution short of having Sram change their fluid. But it is still not great.