Steerin wheel goes stiff, and the car goes off. brake light n battery light up?

it seems fine when driving fast but wn i apply brakes n slow down sometimes, the steering wheel goes really stiff and is very hard to turn. engine goes off too and the battery and brake light up. brake fluid, steering fluid all just topped up. fuel filter was also changed 2 days ago. belts changed too. it is a... show more it seems fine when driving fast but wn i apply brakes n slow down sometimes, the steering wheel goes really stiff and is very hard to turn. engine goes off too and the battery and brake light up.
brake fluid, steering fluid all just topped up. fuel filter was also changed 2 days ago. belts changed too.
it is a mitsubishi galant
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