Lexus RX300 (MCU15). Manual — part 52

CH

BO

CHASSIS — SUSPENSION AND AXLES

81

3) Rebound Spring

In the front shock absorber with a built in rebound spring, the function of the rebound spring that is
provided in the shock absorber case combines with the function of the coil spring in order to restrain
the elongation of the entire suspension during rebounds. Consequently, only the function of the coil
spring is applied when the suspension stroke is small during normal driving, in order to realize a soft
and comfortable ride. However, when the inner wheel makes large rebounds, such as when the vehicle
is cornering, the functions of both the rebound spring and the coil spring are combined in order to reduce
the elongation of the entire suspension. As a result, the vehicle’s excellent maneuverability and stability
have been realized.

Standard

Length

Rebound

Spring

Free Length

Beginning Stroke
of Rebound Spring

Rebound
Stopper

Rebound
Spring

Stopper Plate

Collapsed Height of
Rebound Spring

Fullstroke
State

Rebound
Spring

Rebound

Coil Spring

Entire Suspension

Characteristics of shock absorber
with built-in rebound spring

185CH16

Load

Bound

Stroke

Beginning Stroke
of Rebound Spring

185CH17

Without Rebound Spring

With Rebound Spring

187CH10

CHASSIS — SUSPENSION AND AXLES

82

3. Rear Suspension

D MacPherson strut suspension is used.

D Rear suspension realizes excellent stability and controllability by optimizing the suspension geometry

and camber change.

187CH11

JAXLES

A double – row angular ball bearing is used for both the front and rear axles.

187CH12

Front Axle

187CH13

Rear Axle

Double – Row
Angular Ball
Bearing

Double – Row
Angular Ball
Bearing

CH

BO

CHASSIS — BRAKES

83

BRAKES

JDESCRIPTION

D The ventilated disc brakes is used for front brakes and the solid disc brakes is used for rear brakes.

D The ABS with EBD & Brake Assist & TRC & VSC system is provided as standard equipment.

ABS (Anti-lock Brake System), EBD (Electronic Brake force Distribution), TRC (Traction Control),
VSC (Vehicle Stability Control)

187CH14

"

Specifications

A

Master Cylinder

Type

Tandem

Master Cylinder

Diameter

mm (in.)

25.4 (1.0)

Brake Booster

Type

Tandem

Brake Booster

Size

in.

8.5” + 8.5’’

Type

Ventilated Disc

Front Brake

Caliper Type

AX60

Front Brake

Wheel Cylinder Dia.

mm (in.)

60.33 (2.38)

Rotor Size (D

× T)*

mm (in.)

296

× 28 (11.65 × 1.1)

Type

Solid Disc

Rear Brake

Caliper Type

PD40R

Rear Brake

Wheel Cylinder Dia.

mm (in.)

40.45 (1.59)

Rotor Size (D

× T)*

mm (in.)

288

× 10 (11.33 × 0.39)

Type

Drum

Parking Brake

Size

mm (in.)

170 (6.69)

g

Lever Type

Pedal

ABS with EBD & Brake Assist & TRC & VSC

STD

*: D: Outer Diameter, T: Thickness

CHASSIS — BRAKES

84

JMASTER CYLINDER AND BRAKE BOOSTER

D A type of brake booster into which the master cylinder is inserted has been adopted to achieve a compact

configuration.

D A long-type 8.5-inch tandem brake booster that matches the stroke of the master cylinder has been adopted

to achieve an optimal braking force.

187CH15

187CH16

LHD Model

RHD Model