My car is working fine but for the last couple of weeks when you break everything is fine but when your slowly coming to a stop light/sign the break ( right when it gets between 10 to 5 mph ) kinda gives and makes a loud noise pushing right to the floor.We took it to a garage and they bleed the brake lines and calipers and said it was built in air...did not help at all!Now the battery light came on along with the seat belt light as well as the ABS light. The speedometer and gas valve were going up and down like crazy ( like the car was going to die )l do not know what is going on!O, and the ''brakes'' are still the same.
l have a 10 month old and l need the car to be safe for her to drive in.l can not believe that garage did not fix the actual problem.l do not have any money left after them to bring it to another garage but for now I'd like to possibly know what it could be. Thank you so much.

could be bad pcm (computer)
that would explain the crazy gauges and could be turning the abs
on when you brake. that would explain the weird brakes. l would be able to tell you for sure if l drove it.. take it to a shop with GOOD scanners (dealer) and have them scan the computer. sounds like bad pcm to me.

unfortunately later 90 is model dodge neon have been known to have bad brakes for some reason. had several friends with the same brake problems and were told it was a defect of some sort with the factory brake setup. the electrical problem may be the voltage regulator. not sure if the dodge neons voltage regulator is built into the altenator or is a stand alone unit. have that checked

l think when u took it to the garage for what was wrong with it by some strange coincidence they might have created other problems for it,if the only problem u was having was the brakes to start with & now u have all these other problems something is going on with it,id do this, take it to auto zone & have them scan the computer & they can tell u what caused the light to come on,then you,ll have a lot better idea of whats going on with it,and they do not charge for this either,does not it seem kind of odd that u have more problems than u started out with,have auto zone scan it & see what trouble codes the computer gives,that will help u more than anything right now,then go from their with it,or come back on here & give us the codes & we can help u more,good luck.

Some of ur descriptions do not make any sense, like ''loud noise pushing right to the floor'' if u mean the brake pedal pushes down or falls to the floor then u likely have a bad brake power booster assembly. This will cause a hissing noise & cause the engine to stall or rev up & act all crazy.
Then u say ''the speedo & gas valve were going up & down'' whats that all about. Do u mean the gages (speedometer & Tachometer - engine speed) were moving erratically? this could be related to the engine on the verge of stalling.
Try this with the engine off pump the brake pedal several times, if it is hard & does not drop after the 3rd or 4th pump, then the basic brake hydraulic system is sound. Start it up & at an idle press & hold the brake pedal, if u suddenly hear a hiss from the engine compartment or near the dash area, & this is accompanied by engine or gages acting erratic, u likely have a bad brake booster assembly (vacuum leak).