Brake Drum: Service and Repair

Fig. 8 Exploded View Of Type 4 Drum Brake Assembly. Pickup & 4Runner 4WD:

Fig. 9 Exploded View Of Type 4 Drum Brake Assembly. Land Cruiser:

REMOVAL
1. Raise and support rear of vehicle, then remove wheel and tire assembly.
2. Remove brake drum. If brake drum cannot be removed easily, insert a suitable screwdriver through hole in backing plate, then push adjuster lever away from adjuster and back of adjustment tension.
3. Remove tension spring, using a suitable tool, then remove rear shoe hold-down spring and pin. Remove rear brake shoe and anchor spring, Fig. 8.
4. On Land Cruiser models, remove front hold-down spring using a suitable tool, then disconnect the parking brake cable from the parking brake bellcrank, Fig. 9.
5. On Pickup and 4Runner models, remove front shoe hold-down spring and pin, using a suitable tool, then disconnect No. 1 parking brake cable from No. 3 parking brake bellcrank.
6. On all models, remove front brake with strut, then disconnect parking brake cable from front shoe. Remove parking brake cable No. 2.
7. Remove adjusting lever spring, then the adjuster from front shoe.

Fig. 3 Measuring Brake Drum Inside Diameter:

Fig. 4 Measuring Brake Shoe Lining Thickness:

INSPECTION
1. Measure brake drum inside diameter. Inside diameter should be 11.61 inches, Fig. 3.
2. Measure brake shoe lining thickness, Fig. 4. Minimum thickness should be .04 inch.
3. Inspect brake lining and drum for proper contact and replace drum or shoes as necessary.
4. Inspect wheel cylinder for corrosion or damage.
5. Inspect backing plate for wear or damage.
6. Inspect bellcrank components for bending, wear or damage.
7. Apply a suitable lubricant to backing plate contact areas.

INSTALLATION
1. Apply a suitable lubricant to adjuster bolt threads and end.
2. Assemble adjuster to lever, then install adjuster lever spring.
3. On Land Cruiser models, install parking brake lever cable to parking brake shoe, then attach cable to bellcrank.
4. On Pickup and 4Runner models, install No. 1 parking brake cable to parking brake lever shoe, then attach the other side of cable to No. 3 bellcrank.
5. On all models, position front shoe in place with end of shoe inserted into piston, then install shoe hold-down spring and pin using a suitable tool.
6. Assemble anchor spring to front and rear shoe, then install rear shoe with end inserted in piston.
7. Install rear shoe hold-down spring and pin, then the tension spring.

Fig. 10 Bellcrank Adjustment. Land Cruiser, Pickup & 4Runner 4WD:

8. If necessary, adjust bellcrank as follows:
a. Lightly pull bellcrank in direction "A", Fig. 10, until there is no slack in part "B".
b. Rotate adjusting bolt until dimension "C" is .016-.031 inch.
c. Lock adjusting bolt with locknut, when connect parking brake cable to bellcrank.
d. Install tension spring.
9. Ensure proper parking brake travel.
10. Pull adjusting lever cable upward, then release and ensure adjusting bolt rotates. If bolt does not rotate, check for improper installation of rear brakes.
11. Adjust strut to shortest possible length, then install drum.
12. Pull parking brake lever fully upward. Repeat process several times.

Fig. 5 Measuring Clearance Between Shoes & Drum:

13. Remove drum, then check for proper clearance, Fig. 5. Clearance should be .024 inch. If clearance is not as specified, check parking brake system.
14. Install brake drum, then bleed and refill brake system.
15. Install wheel and tire assembly, then lower vehicle.