Diagnostic Information And Procedures; Brakes Diagnosis Note; Brakes Symptom Diagnosis - Suzuki 2006 SX4 Service Manual

4A-5 Brake Control System and Diagnosis:

Brakes Diagnosis Note

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

Brakes Symptom Diagnosis

Condition
Not enough braking force Brake oil leakage from brake lines
Brake pull (Brakes not
working in unison)
Noise (high pitched
squeak without brake
applied)
Excessive pedal travel
(Pedal stroke too large)
Brake locked

Diagnostic Information and Procedures

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Possible cause
Brake disc or pad stained with oil
Overheated brakes
Badly worn brake pad
Malfunctioning caliper assembly
Malfunctioning brake booster
Malfunctioning brake master cylinder
Air in system
Malfunctioning ABS
Brake pad and disc are wet with water or
stained with oil in some brakes
Disc and/or drum are out of round in
some brakes
Tires are inflated unequally
Disturbed front wheel alignment
Unmatched tires on same axle
Restricted brake pipes or hoses
Malfunctioning caliper assembly
Loose suspension parts
Loose calipers
Contact wear indicator to brake disc
Worn rear brake pad
Partial brake system failure
Brake fluid leaking
Air in system (soft / spongy pedal)
Rear brake system not adjusted
(malfunctioning auto adjusting
mechanism)
Malfunctioning ABS
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.
Correction / Reference Item
Locate leaking point and repair.
Clean or replace.
Determine cause and repair.
Replace.
Repair or replace.
Check system and replace as necessary.
Check system and replace as necessary.
Bleed system.
Check system and replace as necessary.
Clean or replace.
Replace.
Inflate equally.
Adjust as prescribed.
Tires with approximately the same amount of
tread should be used on the same axle.
Check for soft hoses and damaged lines.
Replace with new hoses and new double-
walled steel brake tubing.
Check for stuck or sluggish pistons and proper
lubrication of caliper slide pin.
Caliper should slide.
Check all suspension mountings.
Check and torque bolts to specifications.
Replace brake pad.
Replace rear brake pad.
Check brake systems and repair as necessary.
Repair the leaking point, and bleed air.
Bleed system.
Repair auto adjusting mechanism.
Adjust rear brakes.
Check system referring to "ABS Check in
Section 4E".
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