REMOVAL & INSTALLATION
See Figure 1
On the front wheels, the brake drum is attached to the inside facing of the hub flange. Studs pressed into and through the brake drum protrude through the hub flange, providing mounting points for the wheels as well as securing the brake drum to the hub.
- Raise and support the front end on jackstands.
- Remove the wheel, then the hub and drum assembly from the vehicle.
It may be necessary to back off the brake adjusters to remove the drum.
- Press or drive out the studs to remove the drum from the hub.
- When placing the drum on the hub, make sure that the contacting surfaces are clean and flat.
- Line up the holes in the drum with those in the hub and put the drum over the shoulder on the hub.
- Insert five new bolts through the drum and hub, and drive the bolts into place solidly.
- Place a round piece of stock approximately the diameter of the head of the bolt, in a vise; next, place the hub and drum assembly over it so that the bolt head rests on it. Then flatten the bolt head into the countersunk section of the hub or drum with a punch.
On earlier models, the brake drum is mounted behind the hub flange. On later models, its position is reversed.
- The runout of the drum face should be within 0.030 in. If the runout is found to be greater than 0.030 in., it will be necessary to reset the bolts to correct the condition. The left-hand hub bolts have an L stamped on the head of the bolt. The left-hand threaded nuts may have a groove cut around the hexagon faces, or the word LEFT stamped on the face. Hubs with left-hand threaded hub bolts are installed on the left-hand side of the vehicle. Later production vehicles are equipped with right-hand bolts and nuts on all four hubs.
Using a brake drum micrometer, check all drums. Should a brake drum be scored or rough, it may be reconditioned by grinding or turning on a lathe. Do not remove more than 0.030 in. thickness of metal. If a drum is reconditioned in this manner, it is recommended that either the correct factory supplied, 0.030 in. oversize lining must be installed, or a shim equal in thickness to the metal removed must be placed between the lining and the brake shoe so that the arc of the lining will be the same as that of the drum.