Suzuki 2006 SX4, Service Manual

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4A-5 Brake Control System and Diagnosis:
Diagnostic Information and Procedures
Brakes Diagnosis Note
S6RW0C4104001
Road Testing Brakes
Brakes should be tested on dry, clean, smooth and
reasonably level roadway which is not crowned. Road
test brakes by making brake applications with both light
and heavy pedal forces at various speeds to determine if
the vehicle stops evenly and effectively. Also drive
vehicle to see if it leads to one side or the other without
brake application. If it does, check the tire pressure, front
wheel alignment and front suspension attachments for
looseness. See diagnosis table for other causes.
Brake Fluid Leaks
Check the master cylinder fluid levels. While a slight
drop in reservoir level does result from normal lining
wear, an abnormally low level indicates a leak in the
system. In such a case, check the entire brake system
for leakage. If even a slight evidence of leakage is noted,
the cause should be corrected or defective parts should
be replaced.
Substandard or Contaminated Brake Fluid
Improper brake fluid, mineral oil or water in the fluid may
cause the brake fluid to boil or the rubber components
(piston cups and brake hoses) in the hydraulic system to
deteriorate.
If the above fluid is included in the system, replace the
master cylinder assembly and other rubber components
(hoses). The master cylinder assembly is disassemble
parts to maintain the performance.
The system must be flushed if there is any doubt as to
the grade of fluid in the system or if fluid has been used
which contained parts that have been subjected to
contaminated fluid.
Brakes Symptom Diagnosis
S6RW0C4104002
Condition Possible cause Correction / Reference Item
Not enough braking force Brake oil leakage from brake lines Locate leaking point and repair.
Brake disc or pad stained with oil Clean or replace.
Overheated brakes Determine cause and repair.
Badly worn brake pad Replace.
Malfunctioning caliper assembly Repair or replace.
Malfunctioning brake booster Check system and replace as necessary.
Malfunctioning brake master cylinder Check system and replace as necessary.
Air in system Bleed system.
Malfunctioning ABS Check system and replace as necessary.
Brake pull (Brakes not
working in unison) Brake pad and disc are wet with water or
stained with oil in some brakes Clean or replace.
Disc and/or drum are out of round in
some brakes Replace.
Tires are inflated unequally Inflate equally.
Disturbed front wheel alignment Adjust as prescribed.
Unmatched tires on same axle Tires with approximately the same amount of
tread should be used on the same axle.
Restricted brake pipes or hoses Check for soft hoses and damaged lines.
Replace with new hoses and new double-
walled steel brake tubing.
Malfunctioning caliper assembly Check for stuck or sluggish pistons and proper
lubrication of caliper slide pin.
Caliper should slide.
Loose suspension parts Check all suspension mountings.
Loose calipers Check and torque bolts to specifications.
Noise (high pitched
squeak without brake
applied) Contact wear indicator to brake disc Replace brake pad.
Worn rear brake pad Replace rear brake pad.
Excessive pedal travel
(Pedal stroke too large) Partial brake system failure Check brake systems and repair as necessary.
Brake fluid leaking Repair the leaking point, and bleed air.
Air in system (soft / spongy pedal) Bleed system.
Rear brake system not adjusted
(malfunctioning auto adjusting
mechanism) Repair auto adjusting mechanism.
Adjust rear brakes.
Brake locked Malfunctioning ABS Check system referring to “ABS Check in
Section 4E”.