LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2002 >> 4Runner Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes And Drum Brakes >> Troubleshooting

Disc Brakes And Drum Brakes: Troubleshooting

Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order. If necessary, replace these parts.

PROBLEM SYMPTOMS

Symptom/Suspect Area Refer To
Low Pedal Or Spongy Pedal
Brake System (Fluid Leaks) .....
Brakes System (Air In) BRAKE FLUID 
Piston Seals (Worn Or Damaged) COMPONENTS 
Rear Brake Shoe Clearance (Out Of Adjustment) See Step 3 Under INSTALLATION .
Hydraulic Brake Booster (Faulty) HYDRAULIC BRAKE BOOSTER 
Brake Drag
Brake Pedal Freeplay (Minimal) See Step 3 Under BRAKE PEDAL .
Parking Brake Lever Travel (Out Of Adjustment) PARKING BRAKE LEVER 
Parking Brake Wire (Sticking) .....
Rear Brake Shoe Clearance (Out Of Adjustment) See Step 3 Under INSTALLATION .
Pad Or Lining (Cracked Or Distorted)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Piston (Stuck) FRONT BRAKE CALIPER 
Piston (Frozen) FRONT BRAKE CALIPER 
Anchor Or Return Spring (Faulty) REAR DRUM BRAKE 
Hydraulic Brake Booster (Faulty) HYDRAULIC BRAKE BOOSTER .
Brake Pull
Piston (Stuck) FRONT BRAKE CALIPER 
Pad Or Lining (Oily)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Piston (Frozen) FRONT BRAKE CALIPER 
Disc (Scored) FRONT BRAKE CALIPER 
Pad Or Lining (Cracked Or Distorted)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Hydraulic Brake Booster (Faulty) HYDRAULIC BRAKE BOOSTER 
Hard Pedal But Brake Inefficient
Brake System (Fluid Leaks) .....
Brake System (Air In) BRAKE FLUID 
Pad Or Lining (Worn)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Rear Brake Shoe Clearance (Out Of Adjustment) INSTALLATION 
Pad Or Lining (Oily)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Pad Or Lining (Glazed)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Disc (Scored) FRONT BRAKE CALIPER 
Hydraulic Brake Booster (Faulty) HYDRAULIC BRAKE BOOSTER 
Noise From Brakes
Pad Or Lining (Cracked Or Distorted) FRONT BRAKE PAD 
Installation Bolt (Loose) REAR DRUM BRAKE 
Disc (Scored) FRONT BRAKE CALIPER 
Pad Support Plates (Loose) FRONT BRAKE PAD 
Sliding Pin (Worn) FRONT BRAKE CALIPER 
Pad Or Lining (Dirty)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Pad Or Lining (Glazed)
Front FRONT BRAKE PAD 
Rear REAR DRUM BRAKE 
Anchor Or Return Spring (Faulty) REAR DRUM BRAKE 
Anti-Squeal Shim (Damaged) FRONT BRAKE PAD 
Shoe Hold-Down Spring (Damaged) REAR DRUM BRAKE 
Noise From Hydraulic Brake Booster (Abnormal Pump Motor Operation Noise)
Accumulator Bracket Clearance (Out Of Adjustment) Install Accumulator Bracket 
Brake Warning Light Up (Parking Brake Lever Released) (1)(3)
Brake Fluid Level .....
Hydraulic Brake Booster Power Supply System (Faulty) INSTALLATION 
Brake Warning Lights Up And Brake Warning Buzzer Sounds (2)(3)
Hydraulic Brake Booster Power Supply System (Faulty) HYDRAULIC BRAKE BOOSTER 
ABS Warning Light Lights Up (3)
Anti-Lock Brakes System (Faulty) .....
Hydraulic Brake Booster Power Supply System (Faulty) HYDRAULIC BRAKE BOOSTER 
(1) The light may stay on for about 60 seconds after the engine is started. It is normal if it goes out after a while.
(2) Depressing the brake pedal repeatedly may turn on the warning light and buzzer. It is normal if the light goes off and the buzzer stops sounding after a few seconds.
(3) While ABS warning light is on.