TROUBLESHOOTING GUIDE

P-5spec table

BRAKE SYSTEM

TROUBLESHOOTING GUIDE

Brake System Troubleshooting Guide

Problem	Possible cause	Action	Page
Poor braking	Leakage of brake fluid	Repair	—
Poor braking	Air in lines	Air bleed	P—6
Poor braking	Worn pad	Replace	P—18,22
Poor braking	Brake fluid, grease, oil, or water on pad	Clean or replace	P—18,22
Poor braking	Hardening of pad surface or poor contact	Grind or replace	P—18,22
Poor braking	Malfunction of disc brake piston	Replace	P—19,23
Poor braking	Malfunction of master cylinder	Repair or replace	P—10
Poor braking	Malfunction of power brake unit	Repair or replace	P—15
Poor braking	Malfunction of check valve (vacuum hose)	Repair or replace	P—15
Poor braking	Damaged vacuum hose	Replace	P—15
Poor braking	Deterioration of flexible hose	Replace	P—6
Poor braking	Malfunction of proportioning bypass valve (PBV)	Replace	P—16
Brakes pull to one side	Worn pad	Replace	P—18,22
Brakes pull to one side	Brake fluid, grease, oil, or water on pad	Clean or replace	P—18,22
Brakes pull to one side	Hardening of pad surface or poor contact	Grind or replace	P—18,22
Brakes pull to one side	Abnormal wear, distortion, or eccentricity of disc	Repair or replace	P—18,22
Brakes pull to one side	Malfunction of automatic adjuster in rear brake	Repair	Section M
Brakes pull to one side	Looseness or deformation of dust cover mounting bolt	Tighten or replace	P—18,22
Brakes pull to one side	Malfunction of disc brake piston	Repair or replace	P—19,23
Brakes pull to one side	Worn or improperly adjusted wheel bearing preload	Replace or adjust	Section M
Brakes pull to one side	Improper adjustment of wheel alignment	Adjust	Section R
Brakes pull to one side	Unequal tire air pressure	Adjust	Section Q
Brakes do not release	No brake pedal play	Adjust	P—8
Brakes do not release	Improper adjustment of push rod clearance	Adjust	P—11
Brakes do not release	Clogged master cylinder return port	Clean	—
Brakes do not release	Pad not returning properly	Repair	—
Brakes do not release	Improper return of malfunction of brake caliper piston	Replace	P—21,25
Brakes do not release	Excessive runout of disc plate	Replace	Section M
Brakes do not release	Improper adjustment of wheel bearing preload	Adjust or replace	Section M
Pedal goes too far (Too much pedal stroke)	Air in system because of insufficient brake fluid	Add fluid and bleed air	P—6
Pedal goes too far (Too much pedal stroke)	Improper adjustment of pedal play	Adjust	P—8
Pedal goes too far (Too much pedal stroke)	Worn pad	Replace	P—18,22
Pedal goes too far (Too much pedal stroke)	Air in lines	Bleed air	P—6
Abnormal noise or vibration during braking	Worn pad	Replace	P—18,22
Abnormal noise or vibration during braking	Deterioration of pads	Grind or replace	P—18,22
Abnormal noise or vibration during braking	Brakes do not release	Repair	—
Abnormal noise or vibration during braking	Foreign material or scratches on disc plate contact surface	Clean	—
Abnormal noise or vibration during braking	Looseness of caliper mounting bolt(s)	Tighten	P—19,23
Abnormal noise or vibration during braking	Damage or deviation of disc contact surface	Replace	Section M
Abnormal noise or vibration during braking	Poor contact of pads	Repair or replace	P—18,22
Abnormal noise or vibration during braking	Insufficient grease on sliding parts	Apply grease	—

Poor braking

Possible causeLeakage of brake fluid

ActionRepair

Page—

Poor braking

Possible causeAir in lines

ActionAir bleed

PageP—6

Poor braking

Possible causeWorn pad

ActionReplace

PageP—18,22

Poor braking

Possible causeBrake fluid, grease, oil, or water on pad

ActionClean or replace

PageP—18,22

Poor braking

Possible causeHardening of pad surface or poor contact

ActionGrind or replace

PageP—18,22

Poor braking

Possible causeMalfunction of disc brake piston

ActionReplace

PageP—19,23

Poor braking

Possible causeMalfunction of master cylinder

ActionRepair or replace

PageP—10

Poor braking

Possible causeMalfunction of power brake unit

ActionRepair or replace

PageP—15

Poor braking

Possible causeMalfunction of check valve (vacuum hose)

ActionRepair or replace

PageP—15

Poor braking

Possible causeDamaged vacuum hose

ActionReplace

PageP—15

Poor braking

Possible causeDeterioration of flexible hose

ActionReplace

PageP—6

Poor braking

Possible causeMalfunction of proportioning bypass valve (PBV)

ActionReplace

PageP—16

Brakes pull to one side

Possible causeWorn pad

ActionReplace

PageP—18,22

Brakes pull to one side

Possible causeBrake fluid, grease, oil, or water on pad

ActionClean or replace

PageP—18,22

Brakes pull to one side

Possible causeHardening of pad surface or poor contact

ActionGrind or replace

PageP—18,22

Brakes pull to one side

Possible causeAbnormal wear, distortion, or eccentricity of disc

ActionRepair or replace

PageP—18,22

Brakes pull to one side

Possible causeMalfunction of automatic adjuster in rear brake

ActionRepair

PageSection M

Brakes pull to one side

Possible causeLooseness or deformation of dust cover mounting bolt

ActionTighten or replace

PageP—18,22

Brakes pull to one side

Possible causeMalfunction of disc brake piston

ActionRepair or replace

PageP—19,23

Brakes pull to one side

Possible causeWorn or improperly adjusted wheel bearing preload

ActionReplace or adjust

PageSection M

Brakes pull to one side

Possible causeImproper adjustment of wheel alignment

ActionAdjust

PageSection R

Brakes pull to one side

Possible causeUnequal tire air pressure

ActionAdjust

PageSection Q

Brakes do not release

Possible causeNo brake pedal play

ActionAdjust

PageP—8

Brakes do not release

Possible causeImproper adjustment of push rod clearance

ActionAdjust

PageP—11

Brakes do not release

Possible causeClogged master cylinder return port

ActionClean

Page—

Brakes do not release

Possible causePad not returning properly

ActionRepair

Page—

Brakes do not release

Possible causeImproper return of malfunction of brake caliper piston

ActionReplace

PageP—21,25

Brakes do not release

Possible causeExcessive runout of disc plate

ActionReplace

PageSection M

Brakes do not release

Possible causeImproper adjustment of wheel bearing preload

ActionAdjust or replace

PageSection M

Pedal goes too far (Too much pedal stroke)

Possible causeAir in system because of insufficient brake fluid

ActionAdd fluid and bleed air

PageP—6

Pedal goes too far (Too much pedal stroke)

Possible causeImproper adjustment of pedal play

ActionAdjust

PageP—8

Pedal goes too far (Too much pedal stroke)

Possible causeWorn pad

ActionReplace

PageP—18,22

Pedal goes too far (Too much pedal stroke)

Possible causeAir in lines

ActionBleed air

PageP—6