I have a 1996 Nissan Maxima. About two weeks ago I started hearing a grinding sound every time I braked. Then tonight when I was trying to back out it would reverse just a little and then all of sudden stop almost as if it was stuck on something. It drives forward just fine it the engine sounds fine. When I reversed it almost sounded like something fell off underneath

Squeeling first if it has squeeling tabs. there to let you know the brakes are getting low but if totaly worn out metal on metal grinding sound.

If You are hearing a grinding sound when you press on your brakes it probably has something to do with the brakes again so I would take it back to the place that replaced them 4mo ago and have them fix it cause they should be responsible for your brakes if you just paid them to replace them 4mo ago

dry sliders maby cheep or cracked pads

take it back to them ,they have damaged a abs sensor or the metal ring that makes the sensor read a signal ,Also i have a funny feeling they didnt release the handbrake cable on the adjuster so the light is staying on because they either didnt reset it or damaged the switch under the handbrake lever take it back and ask nicely if they can have a look but dont pay them another halfpenny ,because they should have done it properly to start with and not used a 18yr old inexperianced youth instead of a proper technician ,in my time you was not allowed to work on your own till 3rd year of apprenticeship .But i am on old dinasaur

hi from uk the only thing i would be concerned about at this moment is the grinding when brakes applied ? this sounds very much like your brake pads are very low and most likely worne to the point of damage(grinding metal to rotor contact) is the sound you hear also the abs will sense this and due to unbalance of braking to each wheel abs will operate however i would have thought your car may have low pads warning indicator light system fitted but may not ? may i suggest considering age and possible high milage of your car ? if you have not had pads inspected recently? you do so asap b4 you drive any distance especially at speed ?

spray the break pads and calipers to make sure they are not ingaged

if you will take my word, you will ignore the sound and leave it as it will stop in a little while. I am talking from experience.

Cool down.

Please rate this afterall.

Isn't that supposed be that way, brake safety switch.

so you hear any different sound from the exhaust?
sounds like a plugged cat.
paul

Sounds as if you need the electrical portion of the ignition switch. The contacts inside are most likely worn out.