DIAGNOSIS AND TESTING
BASE BRAKE SYSTEM DIAGNOSIS CHARTS
NOTE: There are three diagnosis charts following
that cover the RED BRAKE WARNING LAMP,
BRAKE NOISE and OTHER BRAKE CONDITIONS.
RED BRAKE WARNING LAMP
CONDITION POSSIBLE CAUSES CORRECTION
RED BRAKE WARNING
LAMP ON
1. Parking brake lever not fully
released.
1. Release parking brake lever.
2. Parking brake warning lamp
switch on parking brake lever.
2. Inspect and replace switch as necessary.
3. Brake fluid level low in reservoir. 3. Fill reservoir. Check entire system for
leaks. Repair or replace as required.
4. Brake fluid level switch. 4. Disconnect switch wiring connector. If
lamp goes out, replace switch.
5. Mechanical instrument cluster
(MIC) problem.
5. Refer to Chassis Diagnostic Procedures
manual.
BRAKE NOISE
CONDITION POSSIBLE CAUSES CORRECTION
DISC BRAKE CHIRP 1. Excessive brake rotor runout. 1. Follow brake rotor diagnosis and testing.
Correct as necessary.
2. Lack of lubricant on brake caliper
slides.
2. Lubricate brake caliper slides.
DISC BRAKE RATTLE OR
CLUNK
1. Broken or missing anti-rattle
spring clips on shoes.
1. Replace brake shoes.
2. Caliper guide pins loose. 2. Tighten guide pins.
DISC BRAKE SQUEAK AT
LOW SPEED (WHILE
APPLYING LIGHT BRAKE
PEDAL EFFORT)
1. Brake shoe linings. 1. Replace brake shoes.
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.
LH BRAKES 5 - 11
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