So the leak in my B-max's boot has apparently been fixed. The garage used a UV dye in water to find the source and there appeared to be two. One was the worn/missing sealing around the bolts that hold the rear sliding door guide rail. The second was around an air outlet behind the rear bumper. The air outlet is there to exhaust air when the doors are rapidly closed in order to prevent excess pressure build up on the window and door seals (I had never considered that cars needed such a feature).

So if anyone else has leaky boot problems then all you need to do it remove the rear light cluster and rear bumper to get to the (probable) source. I can't say exactly where the fixtures are for these parts or how hard they are to get at because I had the garage do it for me. They charged only 1.5 hours labour so it couldn't have been that hard (for the professionals at least).


I've uploaded a couple of pictures to help with the orientation.[img]uploads/949/Bmax_boot_leak_source.jpg[/img]

Thanks for the info .. hopefully won't need it but you never know !

Thanks for the the info, I have often wondered where the air outlet is, not that I am going to do anythng with it, I am just curious about things.

hi all, new to the group but just wanted to add to this thread. I found I had water in the wheel well after having bad condensation in the car. I also noticed that a bag I had stored in the boot (LH storage pocket) smelt slightly of diesel. on investigation I found that the rubber hose that drains water & spilt diesel from the filler cap was blocked and seemed to be leaking in between the panel. behind the storage pocket there is a hole with some foam behind it that was sodden will water and diesel. only just fixed it so can't 100% co firm this was the issue but I'm pretty certain it was.

Get inside the car while someone applies a hose pipe to the outside ?

Hi Berlin BMax.
I am a new member of the his forum.
I too have water in the bootofmy BMax. I cannot see how to view your photos. Did you post them? If so, how do I look at them?

the forum software was updated a while ago, and this broke links to photos

the link should now be
https://www.bmaxownersclub.co.uk/for...eak_source.jpg

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Here is a reply that I posted on another thread on here -

hope that it helps;


I had the same or similar problem - but on removing the rear bumper - the problem was obvious - there is a 15mm square hole at either side under the air vents hidden behind the bumper - which has tape covering it. Over the years, the tape has come adrift and allows water into the inner pannel which then emerges inside the boot seam on one or both sides of the boot area, hidden behind the panels. An easy fix once you have removed the bumper - do this on a warm day as the plastic bits holding the bumper on can get brittle in winter and just snap off. If it is cold - try some warm water on the plastic first to soften it a bit. See pictures. I Just sealed them with some good quality wide sticky PVC tape after cleaning everything.

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