Brake System Troubleshooting; Troubleshooting Guide - Husqvarna HUV4420 Service Manual

HYDRAULIC AND PARK BRAKE SYSTEMS
Park Brake Inspection
• Apply moderate pressure to the park brake pedal. When latched, the park brake should lock the wheels
and hold the vehicle stationary on an incline of 20% or less. If not, adjust the park brake. See Park
Brake Cable Adjustment on page 5-24.
• Check the park brake cables, equalizer, and linkage for damage. The cables should not come in con-
tact with either of the rear wheels or tires.
Brake Disc and Pad Inspection
• Inspect each brake disc. They should not be warped or have excessive scores or heat checks. Each
disc should be at least 0.150 inches (3.8 mm) at the thinnest point.
• Inspect each brake caliper assembly. They should not hold the brake pads tightly against the disc when
not in use.
• Inspect the brake pads for wear. The pads should not be glazed or soiled with grease or brake fluid.
There should be at least 0.020 inches (0.5 mm) of brake pad material at the thinnest point. See follow-
ing WARNING.
ý
WARNING
• Use only approved replacement brake pads designed for your vehicle.
• Use only DOT 5 brake fluid.
• Do not pump brake pedal without fluid in the reservoir or master cylinder.

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
Low pedal – pedal may go to the floor
Troubleshooting Guide continued on next page...
2005 HUV4420 Gasoline and HUV4420-D Diesel Vehicle Maintenance and Service Manual
POSSIBLE CAUSES
Excessive clearance between the disc
and brake pads
Leak in the hydraulic system
Air in the hydraulic system
Weak (bulging) brake line
Improperly adjusted master cylinder push
rod
Brake System Troubleshooting
CORRECTIVE ACTION
See Front Brake Pad Removal on
page 5-6.
See Rear Brake Pad Removal on
page 5-8.
Check the master cylinder, brake lines
and hoses for leaks. Replace all damaged
parts and bleed brake system.
See Bleeding the Hydraulic Brake
System on page 5-22.
Replace the worn hose. See Hydraulic
Line Replacement on page 5-17.
See Brake Pedal Adjustment,
Section 6, Page 6-4.
5
Page 5-3