Rear brake drum - inspection and renewal
1 Whenever a brake drum is removed, brush out dust from it, taking care not to inhale it as it contains asbestos which is injurious to health.
2 Examine the internal friction surface of the drum. If deeply scored, or so worn that the drum has become pocketed to the width of the shoes, then the drums must be renewed.
3 Regrinding is not recommended as the internal diameter will no longer be compatible with the shoe lining contact diameter.
4 If renewing the brake drum it is also advisable to renew the hub bearings and inner oil seal rather than transferring the old. The seal will need renewal in any case.