There is a similar thread here, but instead of <br> it’s the p tag: http://support.advancedcustomfields.com/forums/topic/removing-paragraph-tags-from-wysiwyg-fields/
There are a few filters for this but what I’d recommend is reading up on the
preg_replace php function.
Here’s an example of how I removed p tags and empty spaces with that function:
<?php echo preg_replace('~\s?<p>(\s| )+</p>\s?~', '', get_sub_field('field_name')); ?>
You’d need something along these lines:
<?php echo preg_replace('/(<br>)+$/', '', get_sub_field('field_name')); ?>
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