You have to remove all of the bolts (nuts) on the back side. That should the back side of the axle shaft. Remove the nut and 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.
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