You have to remove all of the nuts on the back side the housing. remove the housing and then remove the slotted axle nut. Pound on the end of the axle shaft with a block of wood and that will separate the assembly to expose the brakes.
The red fluid is ATF which you will need to refill once you've completed the brake job. Replace all of the brake parts including the 2 big O rings.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.