
BRAKES 4-4b
11. General Diagnostics Table
11. General Diagnostics Table
k: Primary expected causes
k k: Secondary expected causes
Brake booster and check valve
Wrong connection and wiring
Hydraulic
Semicylindrical road surface
unit
Loose or worn suspension
Trouble conditions
Rough road surface
Calipers and piston
Axle and wheel
Master cylinder
Solenoid valve
Speed sensor
Stroke sensor
Play of pedal
Mixture of air
Mount bush
Hand brake
Alignment
Symptoms
P valve
Piping
Motor
Rotor
Pad
Tire
Directional stability cannot be
Vehicle turns to right or left. k
k k k
k k k k
k k k k k
k k k k k k
k k k k
obtained when braking.
Vehicle spins. k
k k
k k k k
k k k k
k k
Long braking distance k k
k k k k k k k
k k k k
k k k
k k
ABS function
Brakes lock. k k
k k k
k k k k
k
Brakes drag. k
k k
k k k
k k
k k k
k k k
k k
k
Out-of-order brakes
Long pedal stroke k k k k k k k k
k k
Abnormal vehicle pitching k k k
k k
k k
k
Unstable braking force. One-
side brake refuses to work. k
k k
k k k k k
k k k k k k k k k k
k k k
Vehicle moves unsteadily. k
k k
k k k
k k k k
k k
k k k k
k k
When accelerating abruptly,
directional stability cannot be Handle refuses to work. k
k k
k k
k k
k k k k
k k
obtained when traveling on a
TCS function
slippery road surface.
Handle loses control. k
k k
k k k k
k k k k k k k k k
k k k
Engine stalls. Engine speed
Bad acceleration, engine stall- fails to increase. k
k k
k k k
k k k k
k
ing (In addition to the causes
listed here, check the ECM
specifications.) Engine speed increases sud- k
k k
k k k k k k k k
k k k k k k k
k k
denly.
Brake pedal heavily vibrates
when applying brakes. k k k k k
k k k k
k k
Vibration occurs and abnormal Loud hydraulic unit operating
noise is produced. noise
k k k k
k k k
k