No brake pedal and feels like no front brakes. Brake pedal goes almost to the floor but the back brakes work well. Feels like there is no front brakes at all.

did you add brake fluid and did you check to see how the brake pedal feels when you apply the brakes with the car on? you will have to bleed the air out of the brake lines if the brake pedal goes to the floor when you apply the brakes.

check cylinder brake

Master cylinder must be bench bled before it is installed or it will not build pressure possible you have a bad booster try bleeding the master cylinder first

Hi Alicia,how is your brake fluid?Usually just changing front brake shoes requires no bleeding since the brake line was not open,how were your brakes before you changed the pads,if fluid is low,maybe back wheel cylinders are leaking.Front calibers could be bad,or even master cylinder,need more info.

you definitely need to bleed the breaks

How to Bleed your Brakes by Yourself

Check your lines going to the brakes the rubber hose on the 1993 chevy have a tendancy to crack and brake are you using an excess of brake fluid

when you push pedal hard & pedal goes to floor does brake light come on?
assuming brake fluid leval is ok & didnt run empty have you checked for a leak?
pulling all wheels & inspecting brakes,cylinders, calipers,& lines for leaks.
does the pedal pump up & feel ok with engine running?if so there is air in the system
if it does'nt change the way the pedal feels & no leaks are found & brake linings are ok & adjusted
properly than your master cylinder is leaking internally & needs to be replaced

There is air in the line try rebleeding the system if it was at a shop take it back soon

if the brake edal goes to the floor then either the booster is bad or low on fluid. There is a line on the side of the fluid reservoir to fill too.

did you change the front, back or both. if it was just the front then you need to put new back brakes in because that's were most of your brake pedal feel comes from. if it was both i would start looking at your brake system to see were the rear brake adjustment valve is and then start fiddling with it till it feels better.