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Your brake pads don't have any kind of wire going to your brake pads that will make the brake light come on, check your master cylinder for low on brake fluid, if low look in back of tire's for wetness, if none, top of master cylinder with DOT 3 brake fluid, and have your brake pads checked for wear.
You needed to pay attention when the wheels started squealing several months ago. Pads are down to the rivets and grinding into the rotors.... time for a complete brake job... and a pricey one at that.
Sounds like one of the front brake cylinders leaked brake fluid onto a scored brake rotor. The brake rotor was previously damaged by a worn brake pad. The brake pad wore down to the retaining rivets and created a "groove" on the rotor (like an LP vinyl record). The brake fluid in the groove causes the brakes to seize and make a really loud vibrating grinding sound.
Do a brake job yourself ($50):
1. Fill the brake master cylinder reservoir with brake fluid.
2. By now you know which wheel is leaking brake fluid (front right??)
3. Remove tire and wash the area with mild soap (detergent is ok for this).. including the scored rotor.
4. Purchase brake cleaner spray at an auto parts store and spray all brake parts of the afected wheel.
4. Remove / replace rotor.
5. remove / replace brake pads.
If you want to have a brake shop do the brakes ($175), do steps 1 through 4. You should be able to drive the vehicle to the nearest brake shop, after you test-drive the vehicle in your safe driveway..
If the above description does not match with what you find, then do not drive vehicle. Have it towed.
I assume you mean that you replaced the front pads and rear shoes. Or did you also replace the disks and drums?? Either way you should be ok unless you also replaced the slave cylinders on the rears.
The fluid flows back up to the Master Cylinder as you squeeze the calipers and the slaves to fit the new parts in. Some people pre-fill the caliper to reduce the amount of air and make bleeding easier.Now .....Grinding better be a wrong choice of words.
Possibly you spilled fluid on the pads while bleeding the lines. This will cause a binding and shuddering when you apply brake pressure. This will also make you think the lines are not bled properly because of the increased pedal pressure you are putting on the wet/lubricated front pads. If so, replace the pads. Don't try washing them with aerosol cleaner cause it takes more time and money than simply changing them.