1999 chevy blazer automatic brake system

DTC C0550 00: EEPROM Checksum Mismatch . Your best bet , take your vehicle to a qualified repair shop.
Circuit/System Description
When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an internal malfunction is detected, the control module will store a DTC C0550 in its memory.

Action Taken When the DTC Sets
If equipped, the following module specific actions may occur:
• The antilock brake system (ABS) indicator turns ON.
• The BRAKE warning indicator turns ON.
• The electronic brake control module (EBCM) disables the ABS/dynamic rear proportion (DRP)/traction control system (TCS).
• The driver information center (DIC) displays the power steering warning message No Steering Assist.
• The TCS indicator turns ON.

Black box under hood marked, "fuse box."

I would suspect the water pump, power steering noises are usually grinding sounds. Also if the belts shredded check behind ALL the pulleys for the reinforcing strands from the belts. Basing this on general car problems , not any actual Chevy.

The pass key system isn't working. Make sure your using the same key.There is a piece where a wire brakes in the steering column. Part is cheap but steering wheel needs to be pulled. And dealer needs to reprogram it.

the grinding sound and the high pitch sound may not be related.
the grinding in the brakes means it is time to replace the brake pads / shoes and either replace or repair the discs and drums.

the high pitch noise that you are hearing while turning is more likely caused by a worn belt, low power steering fluid, or a faulty power steering pump.

Although it could be indicating something more serious like hub bearings going out, your best bet is to take it to a front end shop that offers free estimates and have them diagnose it in person.

hope this helps.

There should be a resivoir near the front of the engine, generally on the drivers side. The cap usually has some raised lettering telling you that it is intended for steering fluid only. Hope this helps.

A grinding from the hub sounds like a bad wheel bearing.

sounds like a possible wheel bearing issue or brake pad issue!!! i would definatly have this looked at, but in the meantime, make sure that it isnt just a backing plate contacting the rotor ...hope this was helpful!!

have one person in the blazer pumping the brake pedal and then hold to the floor, crack the bleeder then tighten, release pedal, repeat till all air is out one side at a time, if this does not work then your ABS unit is bad witch if u follow your lines from your master cylinder u will find a black box with a motor on it, or the master cylinder itself is bad, it also can cause u to have no pedal, replace the master cylinder first, most likely cheaper.

grinding on front wheel is caused by 2 things. a bad or loose wheel bearing,or worn out brakes, have them both checked
You might also want to check the level of fluid in the power steering reservoir - low or lack of fluid will also cause a noise (although more of a whining than a grinding).