The Mercury Sable is similar to the Ford Taurus. The mid-size sedan features MacPherson struts at all four corners, except for station wagon models, which feature front struts and rear shock absorbers for suspension components. The basic difference between shocks and struts is that the shock is a suspension component on its own, while the strut assembly integrates the coil spring and is directly attached to the knuckle. Weak, worn or compromised shocks and struts can greatly diminish the performance and safe handling of the Mercury Sable.
Test drive the Sable for response to adverse conditions.
Make a hard stop (on a safe road or parking lot) to determine the rebound response of the Sable. If it nose-dives excessively, this could be due to weak front struts.
Turn the steering wheel back and forth while driving (on a safe road or parking lot) to transfer the weight of the Sable from the left to right side and back again. Determine the rebound response from side-to-side. Determine if noises are apparent, such as creaking, clunking or squeaking. This could be due to one strut or shock on the left or right side being weaker than the other. Excessive sway could indicate weaknesses in both front or all four suspension corners.
Park the Sable on level ground. Transfer your weight onto the rear bumper and bounce the rear suspension aggressively. Get the suspension rocking and then release it. Excessive bounce (anything over two rebound bounces) would indicate weak or compromised shocks or struts. Also note if creaking, clunking or squeaking noises are apparent. This could be due to weak shock or struts shafts, or compromised struts bearing plates. Repeat this step for the front bumper.
Lift the Sable on a car lift and visually inspect the surface and tread wear of the tires. Rub your hands one way across the flat of the tread and then the other way on each individual tire. Feathering or cupping of the tread is a clear indication of excessive bounce on that suspension component. While excessive uneven tire wear may not always be related to shocks or struts, it can help to determine if the suspension components or alignment are compromised.
Raise the Sable up high enough to get under the vehicle and visually inspect the struts and shocks. Visible signs of weakened or compromised shocks and struts include wetness or caked-on dirt and grit from the road directly in the shaft of the shock or strut. Although this may not determine how much gas is left in the shock or strut, it's a clear indication that the suspension component is leaking and will only last so long before becoming compromised.
