I adjusted the height of my brake pedal on my 1989 audi to make it easier to reach the gas from the brake pedal with my heal. It was pretty easy to adjust, I just tightened the adjustment screw on the firewall, but that messed up my vehicle load sensor, which then was tricked into thinking my car was overweighted and caused my brakes to get grabby. A day and a shop manual later though and it was fixed.
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