Brake light is on on my 2003 discovery (land rover) brake fluid leaking from the container

Hi welcome main problems are the abs valves causing the 3 dash lights (search 3 amigos online) a really badly sited compressor can cause air suspension models to fail giving the bags a slow leak the V8 is a solid engine but can have radiator expansion tank and cap failures
the other issue is electrics windows and door looms are problematic

1. Pull out side facing seat or pocket cover.
2. Unscrew fastener and remove access panel.
3. Turn bulb holder anti-clockwise to release.
4. Remove bulb.
Refitting is reverse of the above procedure

well, yes it could mean the fluid is low,why dont you check it.If u need help for this go no further with your own repair inquiries.. another common thing is sticky rear parking brake cables if u have drum brakes on the rear

I use DOT 4 fluid, Castrol. It has a higher boiling point, which is better for a heavy vehicle

if it stopped working make sure your brake lights aren't on. If they are you have a bad brake switch (located under the brake pedal). It's easy to replace. If the lights are not on check the vacuum hose isn't split coming off the intake area. easy fix as well.

remove the lower skid plate under the radiator, it should have a drain in one of the tanks...

dealer only

Probabley its the brake master cylinder, try to bleed the system and check it out if theres good pressure released thro the nipples.

Unfortunately Discoveries will always eventually leak some fluid, People who say theirs do not leak have just not found the problem yet. I just traded a 2003 for a new vehicle. First the power steering can and does leak but since the fluid capacity is not that much, if you have a continous leak and the power steering still works it is probably not the leak you need to address. also the plastic splash guard makes it difficult to identify leaks easily. My 2003 discovery was leaking for a while the leak was from the auto trans cooler. Check the leak colour, white paper under car, red fluid will be the trans fluid, The power steering fluid in the car is a special fluid (not trans fluid) if the correct fluid would be a greenish colour. Other than this oil leaks can be plentiful.

If your brake lights don't work Its because you blew the fuse  which Is located In the main fuse panel under steering wheel.  Without break lights your rover will fire up nice but wont shift out of park until you replace the fuse.  If your ABS Is acting up It Is also an easy fix.  Disconnect the ABS from each wheel.  You still got all wheel disc breaks that work great but no ABS.  Your other option is  thousands of $$.  If your breaks are weak check your master cylinder and make sure you got enough fluid and that you are not loosing the fluid.  If you notice you are leaking brake fluid because you have to keep filling it up but cannot find a leak anywhere.  I bet I know where It is.  Check your rear break lines and make sure one of them didn't get caught in your rear springs and pinched ever so slightly when you were doing dounuts In the snow.
Good luck,