Chrysler 300M 2002 Service Manual page 111

5 - 12 BRAKES - BASE BRAKE SYSTEM
HYDRAULIC/MECHANICAL (Continued)
CONDITION
EXCESSIVE PEDAL TRAVEL
(VEHICLE STOPS OK)
EXCESSIVE PEDAL TRAVEL
(PEDAL GOES TO FLOOR -
CAN'T SKID WHEELS)
EXCESSIVE PEDAL TRAVEL
(ONE FRONT WHEEL LOCKS
UP DURING HARD BRAKING)
PEDAL PULSATES/SURGES
DURING BRAKING
PEDAL IS SPONGY
PREMATURE REAR WHEEL
LOCKUP
STOP LAMPS STAY ON
VEHICLE PULLS TO RIGHT
OR LEFT ON BRAKING
PARKING BRAKE -
EXCESSIVE LEVER TRAVEL
POSSIBLE CAUSES
4. Brake shoe lining transfer to
brake rotor.
1. Air in brake lines.
1. Power brake booster runout
(vacuum assist).
1. One of the two hydraulic
circuits to the front brakes is
malfunctioning.
1. Disc brake rotor has excessive
thickness variation.
1. Air in brake lines.
2. Power brake booster runout
(vacuum assist).
1. Contaminated brake shoe
linings.
2. Inoperative proportioning valve.
3. Improper power brake booster
assist.
1. Brake lamp switch out of
adjustment.
2. Brake pedal binding.
3. Obstruction in pedal linkage.
4. Power Brake Booster not
allowing pedal to return
completely.
1. Frozen brake caliper piston.
2. Contaminated brake shoe
lining.
3. Pinched brake lines.
4. Leaking piston seal.
5. Suspension problem.
1. Rear parking brake shoes out
of adjustment.
CORRECTION
4. Reface or replace brake rotors as
necessary. Replace brake shoes.
1. Bleed brakes.
1. Check booster vacuum hose and
engine tune for adequate vacuum
supply. Refer to power brake booster in
the diagnosis and testing section.
1. Inspect system for leaks. Check
master cylinder for internal malfunction.
1. Isolate condition as rear or front.
Reface or replace brake rotors as
necessary.
1. Bleed brakes.
2. Check booster vacuum hose and
engine tune for adequate vacuum
supply. Refer to power brake booster in
the diagnosis and testing section.
1. Inspect and clean, or replace shoes.
Repair source of contamination.
2. Test proportioning valves folowing
procedure listed in diagnosis and
testing section. Replace valves as
necessary.
3. Refer to power brake booster in the
diagnosis and testing section.
1. Adjust brake lamp switch.
2. Inspect and replace as necessary.
3. Remove obstruction.
4. Replace power brake booster.
1. Replace frozen piston or caliper.
Bleed brakes.
2. Inspect and clean, or replace shoes.
Repair source of contamination.
3. Replace pinched line.
4. Replace piston seal or brake caliper.
5. Refer to the Suspension group.
1. Adjust rear parking brake shoes.
LH