Lexus GS300/400 (2000 year). Service manual — part 107

F02832

–

BRAKE

HYDRAULIC BRAKE BOOSTER

BR–47

2155

(r)

Inspect the left rear ABS solenoid.
(1)

Turn the selector switch to ”LH” position.

(2)

Depress the brake pedal several times and release
the brake pedal when the pump begins rotating.
Wait until the pump stops.

(3)

Turn the ignition switch OFF.

(4)

Depress the brake pedal with a force of 343 N (35
kgf, 77 lbf), record the fluid surface in the reservoir
tank of the hydraulic brake booster.

(5)

Press the MAIN push switch for 10 sec., and check
that the fluid surface in the reservoir tank of the hy-
draulic brake booster does not rise up at this time.

If the fluid surface level rises up, replace the hydraulic brake
booster.
NOTICE:
Do not press MAIN push switch for more than 10 sec. When
operating the switch continuously, do it an interval of more
than 20 seconds.

(6)

Start the engine and run it at idle.

(7)

Depress the brake pedal.

(8)

Release the parking brake pedal and shift the shift
lever to ”L” position.

(9)

Once, release the brake pedal. After depressing the
brake pedal with stable force, then push and hold
MAIN push switch.

(10) Check that the left rear wheel rotates.

If the left rear wheel stops, replace the hydraulic brake booster.
(s)

Stop the engine and lower the vehicle.

(t)

Remove the ”SHEET G” (SST) and disconnect the actua-
tor checker (SST) and sub–wire harness S (SST) from the
hydraulic brake booster.

(u)

Connect the 2 connectors to the actuator.

(v)

Clear the DTC (See page

DI–389

).

BR0JC–04

D01827

LEXUS
Hand–held
Tester

DLC3

BR–4

–

BRAKE

BRAKE FLUID

2112

BRAKE FLUID

BLEEDING

HINT:

If any work is done on the brake system or if air in the
brake lines is suspected, bleed the air from the system.

When bleeding, keep the amount of the fluid within the
line of reservoir between Min. and Max.

NOTICE:

Do not let brake fluid remain on painted surfaces.
Wash it off immediately.

With the reservoir cap removed, when depressing the
brake pedal, the fluid will spray.

1.

FILL RESERVOIR WITH BRAKE FLUID
Fluid: SAE J1703 or FMVSS NO. 116 DOT3

2.

IN CASE OF USING LEXUS HAND–HELD TESTER:
BLEED HYDRAULIC BRAKE BOOSTER

HINT:
If the hydraulic brake booster has been disassembled, discon-
nect the brake line from the hydraulic brake booster or if the res-
ervoir becomes empty, bleed the hydraulic brake booster.
(a)

Turn the ignition switch OFF, depress the brake pedal
more than 40 times.

HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(b)

Turn the ignition switch ON, check that the pump stops af-
ter approx. 30 to 40 seconds.

NOTICE:
When the pump does not stop, repeat step (a) and (b) again.
(c)

With the ignition switch remained ON, depress the brake
pedal more than 20 times.

(d)

Observe the procedure in step 4 and bleed the right and
left front brake caliper.

(e)

Holding the brake pedal depressed, bleed the right and
left rear brake caliper.

HINT:
It is not necessary to depress the pedal continuously, as brake
fluid flows out by first depressing.

(f)

Connect LEXUS hand–held tester.
(1)

Turn the ignition switch OFF, connect the LEXUS
hand–held tester to DLC3.

(2)

Turn the ignition switch ON, and select ”AIR
BLEEDING” on the LEXUS hand–held tester.

HINT:
Please refer to the LEXUS hand–held tester operator’s manual
for further details.

F06049

–

BRAKE

BRAKE FLUID

BR–5

2113

(g)

Bleed right front brake line.
(1)

Select ”FR LINE” on the LEXUS hand–held tester.

(2)

With ”FR LINE” turned ON with the LEXUS hand–
held tester, depress the brake pedal and hold it to
bleed the right front brake caliper.

(3)

Repeat step (2) until there are no more air bubbles
in the fluid.

(h)

Bleed left front brake line.
(1)

Select ”FL LINE” on the LEXUS hand–held tester.

(2)

With ”FL LINE” turned ON with the LEXUS hand–
held tester, depress the brake pedal and hold it to
bleed the left front brake caliper.

(3)

Repeat step (2) until there are no more air bubbles
in the fluid.

(i)

Bleed rear brake line.
(1)

Select ”RR LINE” on the LEXUS hand–held tester.

(2)

With ”RR LINE” turned ON with the LEXUS hand–
held tester, bleed the left and right rear brake cali-
per.

(j)

Disconnect the LEXUS hand–held tester from DLC3.

(k)

Clear the DTC (See page

DI–389

).

3.

IN CASE OF USING ABS ACTUATOR CHECKER
(SST):
BLEED HYDRAULIC BRAKE BOOSTER

HINT:
If the hydraulic brake booster has been disassembled, discon-
nect the brake line from the hydraulic brake booster or if the res-
ervoir becomes empty, bleed the hydraulic brake booster.

(a)

Disconnect the 2 connectors from the hydraulic brake
booster.

F02821

Hydraulic Brake
Booster

Sub–Wire harness S (SST)

AIR BLEED

FRONT

REAR

Actuator Checker (SST)

BR–6

–

BRAKE

BRAKE FLUID

2114

(b)

Connect the actuator checker (SST) to the hydraulic
brake booster side wire harness via the sub–wire harness
S (SST), as shown in the chart below.
SST

09990–00150, 09990–00480

HINT:
Connect the connector with the label of ”AIR BLEED” attached
to the connector of actuator checker.
(c)

Connect the red cable of the actuator checker to the bat-
tery positive (+) terminal and the black cable to the nega-
tive (–) terminal.

(d)

Turn the ignition switch OFF, depress the brake pedal
more than 40 times.

HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(e)

Turn the ignition switch ON, check that the pump stops af-
ter approx. 30 to 40 seconds.

NOTICE:
When the pump does not stop, repeat step (d) and (e) again.
(f)

With the ignition switch remained ON, depress the brake
pedal more than 20 times.

(g)

Observe the procedure in step 4 and bleed the right and
left front wheel caliper.

(h)

Holding the brake pedal depressed, bleed the right and
left rear wheel caliper.

HINT:
It is not necessary to depress the pedal continuously, as brake
fluid flows out by first depressing.