Pioneer 1200 Maintenance Service Manual page 50

6
MC012C-AS00 TRANSAXLE: HYDRAULIC AND PARK BRAKE SYSTEMS
TROUBLESHOOTING GUIDE
SYMPTOM
Low pedal – Pedal may go to the floor,
continued
Springy or spongy brake pedal – Brake
pedal has soft, springy or spongy feel
when depressed
Hard pedal – Excessive pedal pressure
is required to stop the vehicle
Over-aggressive braking
Vehicle pulls to one side
Troubleshooting Guide continued on next page...
Page 6-4 2003 Pioneer 1200/1200SE Gasoline Vehicle Maintenance and Service Manual
POSSIBLE CAUSES
Weak (bulging) brake hose
Improperly adjusted master cylinder push
rod
Bent or distorted brake shoes
Cracked or thin drums
Poor quality brake fluid (low boiling point)
Weak (bulging) brake hoses that expand
under pressure
Air in the hydraulic system
Brake fade
Grease or brake fluid on the brake shoe
linings
Glazed brake shoe linings
Damaged or distorted brake shoes
Scored or barrel-shaped brake shoe
drums
Clogged master cylinder lines or hoses
Frozen master cylinder piston
Incorrect or distorted brake shoes
Grease or brake fluid on the brake shoe
linings
Loose or distorted brake backing plate
Scored or warped brake drums
Corroded master cylinder bore
Binding brake pedal linkage
Incorrect or distorted brake shoes
Brake System Troubleshooting
CORRECTIVE ACTION
Replace the worn hose. See Hydraulic
Line and Hose Replacement on
page 6-23.
See Brake Pedal Adjustment,
Section 5, Page 5-2.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.
Replace brake drums. See Brake Drum
Removal on page 6-6.
Purge hydraulic fluid and fill with approved
DOT 5 (silicone) brake fluid. See Purging
the Hydraulic System on page 6-32.
Check the master cylinder, brake lines
and hoses for leaks or bulges. Replace all
damaged parts.
See Bleeding the Hydraulic Brake
System on page 6-31.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.
Replace hub or axle seal and replace the
brake shoes. See Brake Shoe Removal
on page 6-8.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.
Replace the brake drums. See Brake
Drum Removal on page 6-6.
Replace brake lines or hoses as required.
See Hydraulic Line and Hose
Replacement on page 6-23.
Replace master cylinder. See Master
Cylinder Removal on page 6-29.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.
Replace hub, axle seal or wheel brake
cylinder and replace brake shoes. See
Brake Shoe Removal on page 6-8.
Tighten or replace the back plate and/or
hardware.
Replace the brake drums. See Brake
Drum Removal on page 6-6.
Replace master cylinder. See Master
Cylinder Removal on page 6-29.
Lubricate and adjust. See Section 5 –
Accelerator and Brake Pedal
Assemblies.
Replace the brake shoes. See Brake
Shoe Removal on page 6-8.