That's generally true, although I don't know the exact percentages. It
still doesn't change the fact that the front pads are thicker and work in
less stressful (better heat dissipation) conditions. ;-)
My -98 A6 only has pad wear indicators on the front brakes (as these are
supposed to wear out first I'm told).
If your rear pads always wear out first I'd say your rear calipers are
stuck/partly stuck and needs to be moved up/replaced.
This is very common here (Norway) due to salting of roads during winter.
Recheck your sources. Placement of sensors was not determined due to how often
front or rear pads wear out.
The idea with having the sensors on the fronts is that loss of braking ability
on the front axle has greater consequences than losing it on the back.
Not always. Many will tell you that they've worn out more rear pads than fronts,
despite having fully-functional (i.e. not binding or rusted) sliding calipers
and pistons. But yes, stuck calipers will cause dragging pads, hence wear - but
this problem is easy to detect due to the outside pad wearing more quickly than
the inside one, on a given brake.
I agree with that one, living in Scandinavia. I have had a stuck caliper on the
rear, due to salt water seeping through the rubber bellows protecting the pin on
which the caliper slides. It was sufficient to file away the rust, grease it,
refit, then replace pads. I must have dislodged the bellows through careless use
of my water hose . . .
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