| CAUSED BY: |
CORRECTION NEEDED: |
| Low fluid in master cylinder reservoir; air in hydraulic lines. |
Refill master cylinder and bleed system. |
| Leaking primary cup in master cylinder; ports closed or restricted with dirt; defective hoses; leaking check valve fails to keep hydraulic system. |
Check all components and make corrections required. |
| Excessive lining-to-drum clearance. |
Adjust drum brakes or replace linings. |
| Leaks in hydraulic lines. |
Replace defective lines. |
| |
| B. PRESSURE BUILD-UP IN HYDRAULIC SYSTEM |
| CAUSED BY: |
CORRECTION NEEDED: |
| Master cylinder piston fails to stop, keeping compensating port closed. |
Check all components and make corrections required. |
| Contaminated fluid causing cup swelling. |
Drain, flush, and replace fluid, replace cups. |
| Hose cylinder ports closed or restricted with dirt, or weak return spring. |
Overhaul or replace. |
|
Damaged hose. |
Replace. |
|
Stuck solenoid at rear of master cylinder. |
Replace. |
|
| CAUSED BY: |
CORRECTION NEEDED: |
| Worn or cracked drums or machined beyond allowable oversize limits. |
Replace drums. |
| Vibration with loose bolts, out-of-round drums. |
Tighten hum bolts, recondition or replace drums. |
| Shoe clatter, lining coated with grease. |
Correct cause of grease leakage, reline and grind for proper contact. |
| Vibration with loose bearing adjustment or rough bearing. |
Adjust bearings or replace. |