brakes problem

I have this problem with my brakes where when the brakes are pressed they make a hissing noise. They are also very weak. Any ideas?

Most shops usually do free brake inspections and will give the price it would cost to fix it.

Dont go to brake check. They will over over charge you. But they will tell you what you need.

I have an 88 Formula and I replaced the rear end about 3 months ago. The emergency line does not fit up with the calipers that are on the new/used rear end that I put in. The rear end that I put in my car came out of an 89 RS. All the part numbers are the same for both cars and I can not figure out why they do not match up. The calipers that came on the new/used rear end are vented. <y old ones were not. Can someone please give me an idea of what to do?