It is misleading that Conrad calls a single-section pot "mono" and a dual-section pot "stereo:"
Since these are LINEAR taper, they are not really audio controls anyway, so "mono" and "stereo" don't really apply.
I ran into this recently and you might be surprised that audio designers try and avoid log pots quite readily.
The reason given in Small Signal Audio Design was that... well, log pots suck. Their taper tolerance and inter-pot balance is often considerably poorer than their linear counterparts. (Of course that book is quite old).
They go to some great lengths to get log law from a linear pot.
On the OPs problem. In a real car such a sensor would have multiple potentimeters. Usually 3. A micro-controller compares the three values and discards any value significantly different, then averages the other ones. When it gets three values out of tolerance it puts a warning light on and raises a fault code.
In your case you could take both tracks and average them.
Also, a log pot would not be such a bad thing. A real handbrake is arguably log. For a lot of it's travel it does virtually nothing, then as it starts to catch it rapidly increases with little movement of the handle until finally it locks. This would usually be done in software and the mechanics done with rubber bungs to simulate the handbrake pulling against something (the shoes).
Of course to go "HiFi" you don't want a pot at all, or at least you want to compliment it with a load cell at the end. Similar to high end simulator brake pedals. The pot tells you the travel, but the load cell tells you how hard they pull the handle once it gets to the engagement point. Less important on a handbrake as they are "self energising", so they don't need a lot of pressure, unlike disc brakes which are inefficient and require increasing pressure to produce more braking.
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