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Re: Rear end sag
Worn-out springs tend to sag relatively slowly and gradually. Such worn springs are still drivable, but not ideal, due to the negative effect on handling.
A sudden drop in car height is more likely caused by a broken coil. This may be a problem depending on where the break is. A break at the top or bottom is not so bad. But, while the car is still driveable it is not safe. It is effectively 'shorter', so if the rear axle attains near-full extension (caused by crossing speed bumps, railway crossings, etc) the spring can fall out, allowing the rear end to fall to the bump stops. This would drastically affect handling of the car. The spring may damage the car or other traffic as it falls out.
A break in the spring anywhere else is very unsafe and the car should not be driven.
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