Thrustmaster RACELINE PEDALS III Benutzerhandbuch Seite 20

Brake pedal:
The parts that make up the brake pedal's spring are in a
bag. There are two springs with different resistances:
− A1 spring (long, black): weak resistance;
− A2 spring (short, grey): strong resistance.
Set aside the spring that you do not want to use.
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