Just had rear brakes replaced and now there grinding can someone plz help i dont know whats going on

Nico, return to the mechanic and tell them of your problem if rear left is still grinding or right, have them repair and make it right.
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Fixing Grinding Brakes
Rear brake grinding
What Making That Grinding Sound When You Hit the Brakes
Solving Brake Problems

I suggest you pull rear drums or have someone qualified look at rear brakes. it could of broke a spring or other brake hardware. I suggest stop driveing the car until you can inspect or have the brakes inspected..

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What brake you have,maybe need to be change.

Take it back to the mechanic and tell them to check for a loose connection. They probably left the ABS or some other sensor unplugged.

GL,
Td

labor rates and pricing vary greatly town to town state to state. You best option would be to call around your local area to see what the going rate is for a standard rear brake service and a couple of rotors.

Typically the rear caliper slides freeze and the calipers need to be replaced.

You can expect from $200 to $800 dollars depending on what you actually need.

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Check the brake hose going the caliper or drum on that wheel, its probably leaking. That would explain the lack of pressure. Dont know whether your car has disc or drum brakes on the rear, could be either.
But if the hose is leaking, fluid will be all over the inner part of the wheel. And check your brake fluid to see if its low.

Or one of the springs in the drum could have broken or popped off.
That would explain the grinding noise. A broken spring is more likely since
you hear the grinding noise because the brake shoe would always be touching the drum
because the spring keeps the shoe from contacting the drum when the brakes are not being
pushed.

You're lacking some info about this issue. Who replaced the brake pads? It sounds like they may have been incorrectly installed. Another thing... You say "brake pads" but say nothing about the brake shoes. This leads me to believe that the front pads were changed and the rear brake shoes were not. If you do not know how to change them yourself, go to a reputable place to get them checked. Be specific about your problem and have them check the front rotors and brake pads and the rear brake shoes and the drums. It is quite possible that the rear drums need to be replaced or turned. Drums and rotors are fairly inexpensive so I would consider replacing them BOTH. With a little more info, I'm sure someone here could help more Good luck!

see if a pad is on backwards. bring it to a different shop.

The grinding noise in the rear brake drum means that brake shoes are warn out and the metal part of the shoe is touching the drum. You need to replace it asap as it will damage the inner part of the drum and than replacing shoes will not help without skimming or replacing the drum.