Pull apart the caster arm rubber bushes and replace / grease them, check the spring saddles, these can squeak as well. Brake fluid is a good lubricant for the rubber if a quick fix is desired although the long term solution is to replace the offending bits.
Regards,
tote
just grab xc or newer upper arms & fit new bushes, thats what I did with both my XY's & never looked back, if you can do the work yourself should cost about $100 all up (second hand arms, new bushes).
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