Lexus ES300 (2002 year). Manual — part 109

CHASSIS – BRAKE

CH-58

3) Skid Control ECU

Initial Check

After the ignition is turned ON, and the vehicle attains an approximate speed of 6 km/ h (4 mph) or more
only at first time, the skid control ECU performs the initial check.
The functions of each solenoid valve and pump motor in the brake actuator are checked in order.

Self-Diagnosis

If the skid control ECU detects a malfunction in the ABS with EBD system, the ABS and brake

system warning lights that corresponds to the function in which the malfunction has been detected
indicates or lights up, indicated in the table below, to alert the driver of the malfunction.

: Light ON –: Light OFF

Item

ABS

EBD

Skid Control

ECU

ABS Warning Light

Brake System Warning Light

—

At the same time, the DTCs (Diagnosis Trouble Codes) are stored in memory. The DTCs can be read

by connecting the SST (09843-18040) between the Tc and CG terminals of DLC3 and observing the
blinking of the ABS warning light, or by connecting a hand-held tester.

This system has a sensor signal check function. The DTCs can be read by connecting the SST

(09843-18040) between the Tc and CG terminals of DLC3 and observing the blinking of the ABS
warning light after check the function or by connecting a hand-held tester.

The DLC1 has been discontinued.
The DTCs listed below have been added.

DTC No.

Detection Item

C1235 / 35

Foreign matter is attached on the tip of the right front sensor

C1236 / 36

Foreign matter is attached on the tip of the left front sensor

C1238 / 38

Foreign matter is attached on the tip of the right rear sensor

C1239 / 39

Foreign matter is attached on the tip of the left rear sensor

For details on the DTCs that are stored in skid control ECU memory and the DTCs that are output
through the sensor check function, see the 2002 LEXUS ES300 Repair Manual (Pub. No. RM911U).

4) Fail-Safe

In the event of a malfunction in the ABS, the skid control ECU prohibits the ABS operation.
In the event of the malfunction in the EBD control, skid control ECU prohibits the EBD control. Thus,

the brake will be operated in the same condition as in the condition without the ABS with EBD.

CHASSIS – SUSPENSION AND AXLE

CH-37

208CH19

Double-Row Angular
Ball Bearing

Lock Nut (12-point)

208CH20

Double-Row Angular
Ball Bearing

AXLE

1. Front Axle

The front axle use a double-row angular ball bearing which offers low rolling resistance.
A lock nut (12-point) has been adopted and staked for tightening the axle hub in order to ensure the

tightening performance.
This nut cannot reused.

A lead-free material is used in the front axle hub to address environmental concerns.

2. Rear Axle

The rear axle use a double-row angular ball bearing which offers low rolling resistance.
Part of the inner race is integrated with the shaft, thus optimizes the high rigidity.

CHASSIS – BRAKE

CH-51

BRAKE

DESCRIPTION

The ’02 ES300 has a brake system with the following specifications:

Model

’02 ES300

’01 ES300

Front Brake

Type

Ventilated Disc

Front Brake

Rotor Size

for 16 in. wheel

for 15 in. wheel

Rear Brake

Type

Solid Disc

Rear Brake

Rotor Size

for 14 in. wheel

ABS with EBD

STD

—

ABS & TRAC

—

STD

ABS & Brake Assist & TRAC & VSC

—

OPT

ABS with EBD
& Brake Assist & TRAC & VSC

OPT

—

Brake Control Valve

EBD

Dual P valve

Parking Brake Lever Type

Pedal

Specification

Model

’02 ES300

’01 ES300

Master
Cylinder

Type

Tandem

(Lockheed and Lockheed)*

1

(Portless and Portless)*

2

Tandem

(Portless and Lockheed)

Cylinder

Diameter

mm (in.)

22.22 (0.87)

23.8 (0.93)

Brake

Type

Single

Tandem

Brake
Booster

Size

in.

10.5

8.5 + 8.5

Pad Area

cm

2

(in.

2

)

52.9 (8.20)

44 (6.89)

Front

Wheel Cylinder Dia.

mm (in.)

44.45 (1.75) x 2

60.3 (2.38)

Front
Disc
Brake

Rotor Size (D x T)*

3

mm (in.)

296 x 28

(11.65 x 1.10)

275 x 28

(10.83 x 1.10)

Pad Material

PA556H

Pad Area

cm

2

(in.

2

)

21.5 (3.33)

34 (5.27)

Rear

Wheel Cylinder Dia.

mm (in.)

38.1 (1.50)

34.9 (1.38)

Rear
Disc
Brake

Rotor Size (D x T)*

3

mm (in.)

269 x 12

(10.6 x 0.47)

269 x 10

(10.6 x 0.39)

Pad Material

PA544

P Valve

Type

—

Dual

Parking

Type

Duo Servo

Parking
Brake

Drum Inner Dia.

mm (in.)

170.0 (6.69)

*

1

: with ABS with EBD

*

2

: with ABS with EBD & Brake Assist & TRAC & VSC

*

3

: D: Outer Diameter, T: Thickness

CHASSIS – BRAKE

CH-52

211CH28

Master Cylinder

Lockheed and Lockeed

Portless and Portless

Parking Brake

Rear Brake