We regularly hear about mechanics who have difficulties mounting banana springs (Side load springs / Lateral load springs).
In a MacPherson strut, a compressed coil spring will generate a force that constantly and with varying strength exerts a side load pressure on the shock absorber. This condition reduces the life of the shock absorber and its ability to ensure comfortable driving.
A banana-shaped coil spring is designed in such a way that it, when fitted correctly, exerts an opposing force compensating for the aforementioned side load pressure. This creates a balance and leads to the best possible working conditions for the shock absorber, ensuring a longer lifetime.
Before disassembling the strut, it is important to notice the position of the spring with respect to which end of the spring that faces the strut bearing and which end faces the shock absorber's spring seat.