Toyota Corolla

I own a 1986 Toyota Corolla real wheel drive 1.6 engine, carburetor with an automatic transmission.
Lately the power sterring start to give up when I turns either left or right and when I go straight it's OK. It only does it when I turns but It is very bad because the power sterring just completely goes when I turn. I Took all the oil from the receivor which was very black and king of greasy looks and replace it with Lucas power sterring fluid but didn't work.
What you suggest to be the problem.
September 6, 2007.

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