6
Brake System Troubleshooting
HYDRAULIC AND PARK BRAKE SYSTEMS
BRAKE SYSTEM TROUBLESHOOTING
The procedures used in making the checks provided in the following troubleshooting guide can be found in the
referenced sections of this maintenance and service manual.
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Excessive clearance between the disc and
brake pads
See Front Brake Pad Removal on page 6-6.
See Rear Brake Pad Removal on page 6-8.
Leak in the hydraulic system
Check the master cylinder, brake lines and
hoses for leaks. Replace all damaged parts
and bleed brake system.
Air in the hydraulic system
See Bleeding the Hydraulic Brake System
Weak (bulging) brake line
Replace the worn hose.
Low pedal – pedal may go to the floor
Improperly adjusted master cylinder push rod
See Brake Pedal Adjustment, Section 5,
Cracked or thin disc
Replace brake discs.
Hub – 2008-2011 Models on page 6-10.
Poor quality brake fluid or water in fluid
Purge hydraulic fluid and fill with approved
DOT 5 (silicone) brake fluid.
Hydraulic System on page 6-26.
Weak (bulging) brake hoses that expand under
pressure
Check the master cylinder, brake lines,
and hoses for leaks or bulges. Replace all
damaged parts.
Springy or spongy brake pedal – brake pedal
has soft, springy, or spongy feel when pressed
Air in the hydraulic system
See Bleeding the Hydraulic Brake System
Grease or brake fluid on the brake discs or
pads
Replace the hub or axle seal and replace
the brake pads.
2008-2011 Models on page 6-10.
Glazed brake pads
Replace the brake pads.
Caliper – 2008-2011 Models on page 6-6.
Damaged or distorted brake pads
Replace the brake pads.
Caliper – 2008-2011 Models on page 6-6.
Clogged hydraulic lines
Replace brake lines as required.
Hydraulic Line Replacement on page 6-20.
Hard pedal – excessive pedal pressure is
required to stop the vehicle
Frozen master cylinder piston or bent rod
Replace master cylinder.
Cylinder and Reservoir on page 6-23.
Over-aggressive braking
Incorrect or distorted brake pads
Replace the brake pads.
Caliper – 2008-2011 Models on page 6-6.
TABLE CONTINUED ON NEXT PAGE
Page 6-4
2008-2012 All-Wheel Drive Maintenance and Service Manual
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