The 1992 Audi 100 has 3 recalls, two of which carry fire risk: leaking fuel injectors can allow fuel to seep into the engine compartment where a spark from a plug wire can ignite it, and a separate electrical fault in the rear speaker amplifiers can also lead to overheating and fire.
The amplifier issue stems from electrolytic capacitors that can leak internally, and over time, humidity turns that leaked material into an unintended electrical path that causes the amplifier to overheat. On the brake side, the vacuum booster pump that multiplies the force of your foot on the pedal uses internal blades that can wear down faster than expected. When those blades wear, the pump loses pressure and the pedal feels harder to push, requiring noticeably more effort to slow the vehicle and extending stopping distances in a way that can make avoiding a collision more difficult.