Lexus RX300 (MCU15). Manual — part 162

BR061–04

–

BRAKE

BRAKE SYSTEM

BR–1

LEXUS RX300 (RM785E)

BRAKE SYSTEM

PRECAUTION

S

Care must be taken to replace each part properly as it could affect the performance of the brake
system and result in a driving hazard. Replace the parts with parts having the same part number
or equivalent.

S

It is very important to keep parts and the area clean when repairing the brake system.

S

If the vehicle is equipped with a mobile communication system, refer to the precautions in the
IN section.

BR062–06

BR–2

–

BRAKE

TROUBLESHOOTING

LEXUS RX300 (RM785E)

TROUBLESHOOTING

PROBLEM SYMPTOMS TABLE

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.

Symptom

Suspect Area

See page

Lower pedal or spongy pedal

4. Brake system (Fluid leaks)

5. Brake system (Air in)

6. Piston seals (Worn or damaged)

7. Master cylinder (Faulty)

8. Booster push rod (Out of adjustment)

DI–302

BR–4

BR–32

BR–43

BR–14

BR–27

Brake drag

1. Brake pedal freeplay (Minimal)

2. Parking brake pedal travel (Out of adjustment)

3. Parking brake wire (Sticking)

4. Rear brake shoe clearance (Out of adjustment)

5. Pad (Cracked or distorted)

6. Piston (Stuck)

7. Piston (Frozen)

8. Tension or return spring (Faulty)

9. Booster push rod (Out of adjustment)

10.Vacuum leaks for booster system

11.Master cylinder (Faulty)

BR–6

BR–8

–

BR–52

BR–29

BR–40

BR–32

BR–43

BR–32

BR–43

BR–49

BR–27

BR–24

BR–14

Brake pull

1. Piston (Stuck)

2. Pad (Oily)

3. Piston (Frozen)

4. Disc (Scored)

5. Pad (Cracked or distorted)

BR–32

BR–43

BR–29

BR–40

BR–32

BR–43

BR–32

BR–43

BR–29

BR–40

Hard pedal but brake inefficient

1. Brake system (Fluid leaks)

2. Brake system (Air in)

3. Piston (Stuck)

4. Pad (Cracked or distorted)

5. Pad (Oily)

6. Pad (Glazed)

7. Disc (Scored)

8. Booster push rod (Out of adjustment)

9. Vacuum leaks for booster system

DI–302

BR–4

BR–32

BR–43

BR–29

BR–40

BR–29

BR–40

BR–29

BR–40

BR–32

BR–43

BR–27

BR–24

–

BRAKE

TROUBLESHOOTING

BR–3

LEXUS RX300 (RM785E)

Symptom

Suspect Area

See page

Noise from brake

1. Pad (Cracked or distorted)

2. Installation bolt (Loosen)

3. Disc (Scored)

4. Pad support plate (Loosen)

5. Sliding pin (Worn)

6. Pad (Dirty)

7. Pad (Glazed)

8. Tension or return spring (Faulty)

9. Anti–squeal shim (Damage)

10.Hold–down spring (Damage)

BR–29

BR–40

BR–32

BR–43

BR–32

BR–43

BR–29

BR–40

BR–32

BR–43

BR–29

BR–40

BR–29

BR–40

BR–49

BR–32

BR–43

BR–49