Hi Baj and welcome to the forum. Answers to problems on here can sometimes depend on the region of the world you reside in so you may want to add a location to your profile for better targeted replies. You seem to spell in UK English and quote distances in miles but refer to a GLC 250 which is the petrol variant but was not available in the UK in 2016.
I wonder if you have been using the Distronic adaptive cruise control excessively as this will take its toll on brake pad wear. I'm only on 13,000 miles in my June 2016 220d and my pads aren't even half worn yet. As to the crabbing issue, if have an RHD model, just look at the master thread on the subject:
GLC Clonking
and the solution thread:
The FREE all-season tyre swop
I wonder if you have been using the Distronic adaptive cruise control excessively as this will take its toll on brake pad wear. I'm only on 13,000 miles in my June 2016 220d and my pads aren't even half worn yet. As to the crabbing issue, if have an RHD model, just look at the master thread on the subject:
GLC Clonking
and the solution thread:
The FREE all-season tyre swop