Suspension parts in pairs?

[A900ss]

I've got a worn NSF lower ball joint and have always replaced suspension parts in pairs so that each side feels similar.

Wise or just wasting cash?

Thanks.

[phillpot]

Wise (imho)

guess one side could fail because gaiter split and let water in and other be fine but then again that gaiter maybe on the point of splitting ?

[phazed]

Replaced a pair on mine last week, (Powers).

[Goaty Bill]

Always (nearly always) had things done in pairs.
That said, it might easily be argued that a component that can be fully inspected/tested and is known to be in good condition could be left in place.
Best example I can think of that, would be a wishbone.

I would suppose it is just considered good practice, especially when the component is considered 'throw away', as I would suggest a ball joint is.

In general then, I would agree with phillpot and phazed.