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Discussion Starter #1
A common complaint with leaks on the BMW Z3 seems to be in the boot and specifically around the third brake light - the root cause for this is because the gasket perishes over time.. it's a fairly cheap and straight forward process - but I couldn't find any guides for it so thought I'd throw one together as I've just done mine.

Tools/Parts needed:
1 x BMW replacement gasket (p/n: 63 25 8 389 735)
1 x small flat blade screwdriver
1 x medium Phillips head screwdriver
1 x T-8 precision screwdriver
1 x cloth/rag

Step 1:
Open boot and remove black plastic protective cover - this just prise away from the body work (pull it gently):



Step 2:
The PCB which powers the individual brake lights is held in place by 3 x Phillips screws -take your Phillips screwdriver and remove these (highlighted in green circles in below pictures to show location):



Step 3:
Next you need to remove the 2 x T-8 screws which hold the black plastic back plate to the front red plastic lens - these are located either side of the black plastic back plate:



All fixings should now be removed (3 x Phillips screws and 2 x T-8 screws):



All that is now holding the front lens and black plastic back plate in place are the 4 black plastic compression clips - these are located here:



All you do now is work from one side to the other pressing them (gently!) together - once you release the last clip - the front red lens and the back black plastic piece separate:



Step 4:
Remove the old gasket from the red plastic lens and replace with the new gasket:



Comparison shot of old gasket (left) and new gasket (right):


Step 5:
Take your cloth/rag and clean the area around the third brake light to make sure it is free from dirt and grime and to ensure that it's dry:


Final Steps:
Refitting is now just a reversal of removal - this can be quite fiddly though! - although once you have the red lens and black plastic backing clipped together its a fairly easy. The reason I suggested a small flat blade screwdriver above is because this will help enormously when it comes to clipping the black plastic clips onto the PCB.

Job done (and no more leaky boot!! :) ):


Hope this helps!!
 
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