BRAKE – BRAKE SYSTEM
BR–1
BR
BRAKE SYSTEM
PRECAUTION
1. Necessary care must be taken to replace each part
properly as it could affect the brake system
performance. This could cause driving hazards.
Replace each part with an identical part with the
same number.
2. It is very important to keep parts and the area clean
when repairing the brake system.
3. If the vehicle is equipped with a mobile
communication system, refer to the precautions in
the INTRODUCTION section.
BR–2
BRAKE – BRAKE SYSTEM
BR
SYSTEM DIAGRAM
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
B
Brake Tube
Flexible Hose
A
B Union Bolt Torque: 30 N*m (310 kgf*cm, 22 ft*lbf)
w/ ABS:
Brake Tube Way
BRAKE MASTER CYLINDER
BRAKE ACTUATOR
for use without SST:
Union Nut Torque: 15 N*m (155 kgf*cm, 11 ft*lbf)
for use with SST:
Union Nut Torque: 14 N*m (143 kgf*cm, 10 ft*lbf)
A A
A A
C130323E03
BRAKE – BRAKE SYSTEM
BR–3
BR
w/o ABS:
BRAKE MASTER CYLINDER
BRAKE TUBE WAY
PROPORTIONING
VALVE
Brake Tube
Flexible Hose
Brake Tube Way
for use without SST:
Union Nut Torque: 15 N*m (155 kgf*cm, 11 ft*lbf)
for use with SST:
Union Nut Torque: 14 N*m (143 kgf*cm, 10 ft*lbf)
Union Bolt Torque: 30 N*m (310 kgf*cm, 22 ft*lbf)
A
B
B
A
A
A
A
A
A
A
A
A
A
A A
A
A
A
A
A
A
A
A
A
A
B
C133161E01
BR–4
BRAKE – BRAKE SYSTEM
BR
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help you find the cause of the problem.
The numbers indicate the ranked order of probability of each
of the possible causes. Check each part in the order
suggested. If necessary, replace the applicable parts.
Symptom Suspected area See page
Low pedal or spongy pedal
1. Fluid leakage in brake system -
2. Air in brake system BR-10
3. Piston seal (Worn or damaged) BR-50
4. Wheel cylinder cup (Damaged) BR-62
5. Brake master cylinder (Faulty) BR-29
Brake drag
1. Brake pedal free play (Minimum) BR-8
2. Parking brake lever travel (Out of adjustment) PB-2
3. Rear drum brake shoe clearance (Out of adjustment) BR-67
4. Pad (Cracked or distorted) BR-51
5. Brake shoe (Cracked or distorted) BR-62
6. Front disc brake piston (Stuck) BR-50
7. Piston (Stuck) BR-62
8. Front disc brake piston (Frozen) BR-50
9. Piston (Frozen) BR-62
10. Tension or return spring (Faulty) BR-60
11. Booster system (Vacuum leakage) BR-5
12. Brake master cylinder (Faulty) BR-29
Brake pull
1. Front disc brake piston (Stuck) BR-50
2. Piston (Stuck) BR-62
3. Pad (Oily) BR-51
4. Brake shoe (Oily) BR-62
5. Front disc brake piston (Frozen) BR-50
6. Piston (Frozen) BR-62
7. Front disc (Scored) BR-51
8. Rear brake drum (Scored) BR-62
9. Pad (Cracked or distorted) BR-51
10. Brake shoe (Cracked or distorted) BR-62
Hard pedal but braking inefficient
1. Fluid leakage in brake system -
2. Air in brake system BR-10
3. Front disc brake piston (Stuck) BR-50
4. Piston (Stuck) BR-62
5. Pad (Cracked or distorted) BR-51
6. Brake shoe (Cracked or distorted) BR-62
7. Pad (Oily) BR-51
8. Brake shoe (Oily) BR-62
9. Pad (Glazed) BR-51
10. Brake shoe (Glazed) BR-62
11. Front disc (Scored) BR-51
12. Rear brake drum (Scored) BR-62
13. Booster system (Vacuum leakage) BR-5
BRAKE – BRAKE SYSTEM
BR–5
BR
ON-VEHICLE INSPECTION
1. INSPECT BRAKE BOOSTER
(a) Check the air tightness.
(1) Start the engine and stop it after 1 or 2 minutes.
Depress the brake pedal several times slowly.
HINT:
• If the pedal can be depressed to the floor on
the 1st time, but cannot be depressed as far
on the 2nd or 3rd times, the booster is
airtight. If not, inspect the vacuum check
valve.
• If the vacuum check valve is normal, replace
the brake booster assembly.
(2) Depress the brake pedal while the engine is
running, and stop the engine with the pedal
depressed.
HINT:
• If there is no change in the pedal reserve
distance after holding the pedal for 30
seconds, the booster is airtight. If not,
inspect the vacuum check valve.
• If the vacuum check valve is normal, replace
the brake booster assembly.
(b) Check the operation.
(1) Depress the brake pedal several times with the
engine stopped and check that there is no
change in the pedal reserve distance.
(2) Depress the brake pedal and start the engine.
HINT:
• If the pedal goes down slightly, the operation
is normal. If not, inspect the vacuum check
valve.
• If the vacuum check valve is normal, replace
the brake booster assembly.
Noise from brakes
1. Pad (Cracked or distorted) BR-51
2. Brake shoe (Cracked or distorted) BR-62
3. Installation bolt (Loose) BR-48
4. Front disc (Scored) BR-51
5. Rear brake drum (Scored) BR-62
6. Pad support plate (Loose) BR-51
7. Sliding pin (Worn) BR-48
8. Pad (Dirty) BR-51
9. Brake shoe (Dirty) BR-62
10. Pad (Glazed) BR-51
11. Brake shoe (Glazed) BR-62
12. Tension or return spring (Faulty) BR-60
13. Anti-squeal shim (Damaged) BR-48
14. Shoe hold down spring (Damaged) BR-60
Symptom Suspected area See page
NO GOOD GOOD
3rd
2nd
1st
BR02238E02
C121844
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Description
The 2008 Toyota Yaris Service & Repair Manual is a comprehensive guide designed to assist in maintaining and repairing your vehicle. It provides detailed instructions, diagrams, and step-by-step procedures to troubleshoot and fix any issues with the 2008 Toyota Yaris. Whether you are a professional mechanic or a DIY enthusiast, this manual is a valuable resource for servicing and repairing your Toyota Yaris.
This manual covers various models of the 2008 Toyota Yaris, including:
- 2008 Toyota Yaris Hatchback
- 2008 Toyota Yaris Sedan
- 2008 Toyota Yaris RS
- 2008 Toyota Yaris S
Each model is extensively covered, providing the necessary information for repairs or maintenance tasks such as oil changes, brake pad replacements, or troubleshooting electrical issues. The 2008 Toyota Yaris Service & Repair Manual is a valuable resource for addressing unexpected car troubles and maintaining your Toyota Yaris with confidence.
