Diagnostic Information And Procedures; Brakes Diagnosis Note; Brakes Symptom Diagnosis - Suzuki Liana RH413 Service Manual

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
for leakage. If even a slight evidence of leakage is noted,
the cause should be corrected or defective parts should
be replaced.

Brakes Symptom Diagnosis

Condition
Not enough braking force Brake oil leakage from brake lines

Diagnostic Information and Procedures

S3RH0A4104001
Possible cause
Brake disc or pads stained with oil
Overheated brakes
Poor contact of shoes on brake drum
Brake shoes linings stained with oil or
wet with water
Badly worn brake pad linings
Defective wheel cylinders
Malfunctioning caliper assembly
Air in system
Maladjusted sensor spring length of
LSPV, if equipped
Broken sensor spring of LSPV, if
equipped
Defective LSPV, if equipped
Malfunctioning ABS (Antilock brake
system), if equipped
Brake Control System and Diagnosis:
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 in
the hydraulic system to deteriorate.
If primary piston cups are swollen, then rubber parts
have deteriorated. This deterioration may also be
evidenced by swollen wheel cylinder piston cups on the
drum brake wheels.
If deterioration of rubber is evident, disassemble all
hydraulic parts and wash with alcohol. Dry these parts
with compressed air before assembly to keep alcohol out
of the system. Replace all rubber parts in the system,
including hoses. Also, when working on the brake
mechanisms, check for fluid on the linings.
If excessive fluid is found, replace the pads.
If master cylinder piston seals are satisfactory, check for
leakage or excessive heat conditions. If leakage is not
found, drain fluid, flush with brake fluid, refill and bleed
system.
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.
Repair for proper contact.
Replace.
Replace.
Repair or replace.
Repair or replace.
Bleed system.
Check or adjust.
Replace.
Replace.
Check system and replace as necessary.
4A-7
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