Yes, it's very dangerous. The brake drum is made from cast iron which is very brittle. If that crack opens up and spreads, it could cause the brake shoe to bind and put your car into a skid.
Rick
http://free-auto-repair-advice.blogspot.com/
replaced
With rear drum brake:-The brake drum may be out of round or may have a rust spot in it. -The brake drum may be cracked.With rear disc brake:-The brake disc may have extreme lateral runout or be mounted improperly. -The brake disc may be cracked. This would be dangerous-Combination of soft brake pads and a directional finish on the disc surface. A directional finish may go away with use and take the noise with it.Regardless of brake type:A brake disc or drum mounted to a bent hub flange or bent axle shaft can cause this noise.
worn out pad, warped rotor, broken brake caliper (or cracked drum, if drum brakes)
Brake drums can be resurfaced by turning the brake drum in a brake drum lathe. When the brake drum has deep grooves in it, it cannot be repaired.
A drum brake is a brake that uses friction caused by a set of shoes or pads that press against a rotating drum-shaped part called a brake drum. The term drum brake usually means a brake in which shoes press on the inner surface of the drum.
Drum brake? Could indicate a build up of excessive dust in drums -remove drum and clean Disc brake? wear indicators are letting you know it is time for replacement pads. Could also be a sign of cracked or glazed brake pads/shoes. Have your brakes inspected soon.
As per driving conditions .but 2 years or 8oooo kms.
The drum and the brake shoes.
Rear drum brakes or disc?? Drum brakes: Drum out of round, axel seal leaking oil onto shoes, hold down kit came apart causing shoes to jam, parking cable stuck, cracked drum(hardly ever), seized wheel cylinder. Disc: Rotor out of round, seized caliper, cracked rotor (hardly ever), Seized parking brake cable, broken parking brake shoes or hardware jamming up inside rotor
In case of cost..drum brake is better than disc brake.
same happened to my 2002 spec..it was the brake pad was cracked in pieces inside..the fragments were jarred against the caliper and rotor plate.... Frozen brake caliper? Misadjusted drum brake Contaminated brake lining
The purpose of a drum brake is to come to a complete stop with any veichle that may have drum brakes in the rear of the car.