I bought a 1990 ford thunder bird SC, and the antilock and the brake light is on on 1990 Ford Thunderbird SC

the two light,s are on and the brake peadal is stiff and it,s like I have very little or no brake,s i have checked the fuse,s i think it,s 3 in all, there all good, how do i check to see what is wrong?

Asked by for the 1990 Ford Thunderbird SC
Worst case scenario the whole abs unit needs to be replaced. Best case, the brake lines just have air in them and need to be bled so I would start there. Make sure there are no leaks around the reservoir