The standard Land Rover handbrake can easily get bunged up with dirt if you drive off-road a lot and once the mechanism gets clogged up it dose not work as efficiently as it should.
There is now an answer to that problem - a drum to disc conversion kit.
This kit uses a powerful caliper whose mechanism is sealed to prevent the access of mud! The special pads provide greater friction than the standard ones and are resistant from abrasion from mud.