4A-6 Brake Control System and Diagnosis:
Pedal pulsation (Pedal
pulsates when depressed
for braking)
Damaged or loose wheel bearings Replace wheel bearings.
Distorted steering knuckle or rear wheel
spindle
Replace knuckle or rear wheel spindle.
Excessive disc lateral runout Check per instructions. If not within
specifications, replace or machine disc.
Parallelism between brake pad and disc
not within specifications
Check per instructions. If not within
specifications, replace or machine disc.
Brake caliper piston sticking Repair as necessary.
Braking noise Worn or distorted brake pad Replace pads.
Loose front wheel bearings Replace wheel bearings.
Distorted backing plates or loose
mounting bolts
Replace or retighten securing bolts.
Contact wear indicator to brake disc Replace brake pad.
Brake warning light lights
after engine start
Parking brake applied Release parking brake and check that brake
warning light turns off.
Insufficient amount of brake fluid Investigate leaky point, correct it and add
brake fluid.
Brake fluid leaking Investigate leaky point, correct it and add
brake fluid.
Brake warning light circuit faulty Repair circuit.
Malfunctioning EBD system Check system referring to “EBD Warning Light
(Brake Warning Light) Comes ON Steady in
Section 4E”.
Brake warning light turns
on when brake is applied
Brake fluid leaking Investigate leaky point, correct it and add
brake fluid.
Insufficient amount of brake fluid Investigate leaky point, correct it and add
brake fluid.
Brake warning light fails
to turn on even when
parking brake is applied
Brake warning light circuit faulty Replace bulb or repair circuit.
ABS warning light or
ESP
®
warning light turns
on after engine start
Malfunctioning ABS (ESP®) Check system referring to “ABS Check in
Section 4E” or “Electronic Stability Program
System Check in Section 4F”.
ABS warning light or
ESP
®
warning light turns
on when brake is applied
Malfunctioning ABS (ESP®) Check system referring to “ABS Check in
Section 4E” or “Electronic Stability Program
System Check in Section 4F”.
ABS warning light or
ESP
®
warning light does
not turn on for 2 sec. after
ignition switch has turned
ON
Bulb burnt out Replace bulb.
Malfunctioning ABS (ESP®) Check system referring to “ABS Check in
Section 4E” or “Electronic Stability Program
System Check in Section 4F”.
ABS warning light flashes New ABS hydraulic unit / control module
assembly installed.
Perform “ABS Hydraulic Unit Operation Check
in Section 4E”.
Condition Possible cause Correction / Reference Item