You should have an oval master cylinder reservoir, with a large black lid towards the firewall on the drivers side. You should see a MIN/FULL level labeled on the side. Use only Mopar┬® brake fluid or an equivalent from a tightly sealed container. Brake fluid must conform to DOT 3 specifications. Do not use petroleum-based fluid because seal damage in the brake system will result.
If necessary, add specified brake fluid bringing level to the FULL mark on the side of the brake fluid reservoir.