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