I fixed my parking brake in a 2010 LR4 just last month by removing entire module and cables and replaced the gears ($15 from eBay) and I thought it much easier than anticipated. Earlier in this thread I linked a video chronicling a British man changing a LR3 parking brake and it wasn’t anywhere near that difficult. Maybe it’s because I have a California car with no rust but there was no need to mess with the rusted bracket like he did, the LR4 seems like a different and easier design to remove it. There are only two screws in a rubber washer that are easily accessible that need to be removed.
It takes a long time because there are many steps but it wasn’t nearly as intimidating as I anticipated. First, several hours watching videos (no one single video showed everything but watching two from BritPart, one from Emmanuel Tatouris, one from Atlantic British, and two from Powerfulukltd, plus reading Bodsky’s Brake Bible I was able to get a good picture of what to do) and getting courage to tackle the job. Then ~11 hours car time for me, who is not very experienced mechanically (I’ve never even replaced brakes) but the $2200 shop repair estimate made me bold enough to try.
The good news, I believe that, is that if you hear a grinding or screeching that means the module motor is probably good, it’s working to try and engage the brake but can’t. I think there is a design flaw in the parking brake motor/cable system that makes it prone to “fail”. It fails because the brake cables connect to a bolt that is supposed to be partially threaded into the module and pulling it activates the brake. Eventually this bolt can get screwed completely in making it so tight that it can no longer release the brake cable without the emergency release. The gears in my parking brake were perfectly intact. I replaced them but I don’t think it was necessary. Threading the bolt to the correct depth was all that was required.
The attached photo shows the open module with the bolt (yellow circle) completely removed. It is supposed to be threaded 5 turns into tube circled in blue, a little less than halfway in. Mine was threaded all the way to the bolt head. I use my parking brake daily (sloped driveway) and hasn’t given me any problems in the month since repair.
Let me know if you’re interested in more details as I have more pictures and some video.