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 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.
6. ABS EBD malfunction. 6. Refer to ABS section and 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.
DRUM BRAKE CHIRP 1. Lack of lubricant on brake shoe
support plate where shoes ride.
1. Lubricate shoe contact areas on brake
shoe support plates.
2. Wheel cylinder out of alignment. 2. Loosen wheel cylinder mounting bolts,
realign wheel cylinder with brake shoes and
tighten mounting bolts.
DRUM BRAKE CLUNK 1. Drum(s) have threaded machined
braking surface.
1. Reface or replace drake drums as
necessary.
DRUM BRAKE HOWL OR
MOAN
1. Lack of lubricant on brake shoe
support plate where shoes ride and
at the anchor.
1. Lubricate shoe contact areas on brake
shoe support plates and at the anchor.
2. Rear brake shoes. 2. Replace rear brake shoes.
5s - 2 BRAKES-BASE PL
BRAKES-BASE (Continued)
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