DIAGNOSIS AND TESTING - BASE BRAKE
SYSTEM DIAGNOSIS CHARTS
NOTE: There are three diagnosis charts following
that cover the RED BRAKE WARNING INDICATOR
LAMP, BRAKE NOISE and OTHER BRAKE CONDI-
TIONS.
RED BRAKE WARNING INDICATOR LAMP
CONDITION POSSIBLE CAUSES CORRECTION
RED BRAKE WARNING
INDICATOR LAMP ON
1. Parking brake lever not fully
released.
1. Release parking brake lever.
2. Parking brake warning indicator
lamp switch on parking brake lever.
2. Inspect and replace switch as neces-
sary.
3. Brake fluid level low in master
cylinder reservoir.
3. Fill reservoir to proper level. Check
entire system for leaks. Repair or replace
as necessary.
4. Brake fluid level switch. 4. Disconnect brake fluid level switch. If
lamp goes out, replace switch.
5. Air in brake hydraulic system. 5. Bleed brakes. Check entire system for
leaks. Repair or replace as required.
6. ABS malfunction. 6. Refer to Appropriate Diagnostic Informa-
tion.
BRAKE NOISE
CONDITION POSSIBLE CAUSES CORRECTION
DISC BRAKE CHIRP 1. Excessive brake rotor runout. 1. Follow brake rotor diagnosis and test-
ing. Correct as necessary.
2. Contaminated brake shoe linings. 2. Inspect and clean, or replace shoes.
Repair source of contamination.
DISC BRAKE RATTLE OR
CLUNK
1. Broken or missing anti-rattle
spring clips on shoes.
1. Replace brake shoes.
2. Caliper mounting bolts loose. 2. Tighten mounting bolts to specifications.
DISC BRAKE SQUEAK AT
LOW SPEED (WHILE
APPLYING LIGHT BRAKE
PEDAL EFFORT)
1. Brake shoe linings. 1. Replace brake shoes.
2. Contaminated brake shoe linings. 2. Inspect and clean, or replace shoes.
Repair source of contamination.
SCRAPING (METAL-TO-
METAL).
1. Foreign object interference with
brakes.
1. Inspect brakes and remove foreign
object.
2. Brake shoes worn out. 2. Replace brake shoes. Inspect rotors.
Reface or replace as necessary.
ZB BRAKES - BASE 5 - 3
BRAKES - BASE (Continued)
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