The drums don't disassemble-they are one piece. They should be removed and turned by a shop then you should replace springs on backing plate and shoes. It is not a job for a novice. the shoes can be purchased with/without the springs and are color coded.
When the shoes/pads have less than 10% of lining left. When shoes/pads are cracked or damaged. When the drums/rotors are replaced.
Brake drums should not be turned beyond a maximum diameter, usually stamped on the drum face. Machining them above the maximum tolerance would subject them to overheating and possible brake failure. Better to replace them with new drums & shoes.
Pads or shoes worn beyond usable. Replace pads and rotors or shoes and drums as needed.
Pull the rubber adjuster cover from the rear of the drum assembly and use a screw driver or brake tool to run the shoes in. If the shoes are still hung up on a ridge in the drum itself, run bolts into the to removal holes on the face of the drum. If the drums are hung up on the shoes, it is imperative that you have a full hardware kit to replace the pins/clips that you are likely to bend/break (you should replace all of the hardware anyway). It is also a good idea to replace the drums in this circumstance, as they are cheap, and ridges deep enough to get everything really hung up indicate that the drum lining has exceeded its service life. In short, brute force is the answer (as it is for most badly worn drums).
all the time
This will depend if it's just the pads, or the entire system? There can be no reason to do the entire system. pads, shoes, rotors, drums, calipers. It all cannot be bad and there is no way to answer.
What should it cost to replace rear brakes, drums and rotors, '96 Volvo 850 GLT.
if the new brake shoes are showing abnormal signs not long after you replaced them then i would be checking the spring kit holding down the brake shoes could be weak or improperly installed or the out of round and tapper of the drums. have them measured by a licenced techician to see if they can be turned on a machine to straigthen them or if they need replacing. drums tend to Bell Mouth leaving an abnormal wear on the shoes making them thinner on one edge then the other.most drums with this condition need to be replaced as it would take to much material off the inside of the drum and would put the overall measurement into the discard range. drums are cheap theses days if you suspect your drums are no good or are really rusted then buy new ones adjust the shoes to the new drums. always replace spring kits when doing rear shoes to usure everything works the way it is suppose to .
yes they will. in addition to the larger 10 inch drums (should have cooling fins on the exterior of the drums) you will need a set of 10 inch brake shoes.
On The rear if you have drums
to remove drums