I wish I did this ages ago. Three amigos popped up yesterday at 3, Option B done by 5-ish, Brady back on the road by dinner. What an elegant solution to such a dumb problem.

 

Hardest part is not making a mess spilling brake fluid

 

I've done 3 or 4 and never opened the hydraulics. I stub of a 4mm allen key stuck in a 4mm socket allows you to remove the switch pack with the WABCO unit in place.

 

ok actually yes, that haha. I ended up rubber banding a latex glove to the brake fluid reservoir cap hole to create a vacuum and eventually stop it from bleeding out everywhere. Helped a little but still a mess at first.

 

Did you have to rebleed the brakes? It looks like air could get in the system?

 

Oh man, yeah so much air got in there haha. I expected this though and conveniently it aligned with my normal brake fluid replacement interval anyway.