Originally Posted by
Bad Lag
Thank you, the cheapest I found was at least 3X that price.
My levers are marked "DOT 4" not mineral oil but that is a minor issue.
It is a major issue.
Never mix them.
DOT fluid is corrosive, so you have to take extra care.
Also, it suggests the brakes are Avid/SRAM. Their economy versions are a nightmare and behave as you describe.
I would take this to a shop and have them fix it. If they can't do that readily, cut your losses and install Shimano.
Don't go for cable-actuated disc brakes. It is a step backward. Go for properly functioning hydraulics.