Lexus RX300 (MCU15). Service 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
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