The 1987 Jaguar XJ6 has 3 recalls, the most serious being a cruise control microswitch that can fail to disengage the system when the brake pedal is pressed, leaving the vehicle accelerating while brake lights go dark behind you.
On the braking side, the power brake accumulator switches can lose electrical power and stop the hydraulic system from recharging itself. When this happens, the power assist that makes the brake pedal feel normal gradually fades, and stopping distances stretch out, raising the risk of a crash in situations where firm, quick braking is needed. There is also a suspension concern: certain lower spring pan bolts on the front suspension can corrode and crack under stress, causing one side of the front suspension to drop down onto its bump stop. When that happens, the ride height becomes uneven and the handling characteristics change noticeably, as the affected corner loses its normal range of suspension travel.