I have been changing brake pads on my W124 300E, 1st gen MR2, 1996 R129 SL500, and the last one, a 2000 W210 Mercedes E430. For over 20 years.
And I recently got a lesson on the E430.
The front pads, at least, have an outward spring and I managed to reverse the pads.
The car would “stop” but only half effective. It…