Excessive Pedal Effort

Possible Causes
1. Frozen or seized pistons.
2. Brake fluid, oil or grease on linings.
3. Pads and shoe lining worn below specifications.
4. Proportioning valve malfunction.
5. Booster inoperative.
6. Leaking booster vacuum check valve.
7. Bent, broken or distorted brake shoes.
8. Caliper, wheel cylinder or master cylinder pistons sticking or seized.
9. Brake fluid contaminated.
10. Low engine vacuum.