Lexus SC300 / Lexus SC400. Manual — part 247

4. CHECK

THAT

PEDAL RESERVE DISTANCE IS CORRECT,

AS SHOWN
Release the parking brake.
With the engine running, depress the pedal and measure the
pedal reserve distance, as shown.

Pedal reserve distance at 490 N (50 kgf, 110.2 lbf):

More than 89 mm (3.50 in.)

If the reserve distance is incorrect, troubleshoot the brake
system.

BRAKE BOOSTER OPERATIONAL TEST

BR03P–0B

1. OPERATING

CHECK

(a) Depress the bake pedal several times with the engine off and

check that there is no change in the pedal reserve distance.

(b) Depress the brake pedal and start the engine. If the pedal

goes down slightly, operation is normal.

2.

AIR TIGHTNESS CHECK

(a) Start the engine and stop it after 1 or 2 minutes. Depress the

brake pedal several times slowly. If the pedal goes down the
farthest the 1st time, but gradually rises after the 2nd or 3rd
time, the booster is air tight.

(b) Depress the brake pedal while the engine is running, and

stop the engine with the pedal depressed. If there is no
change in the pedal reserve travel after holding the pedal for
30 seconds, the booster is air tight.

BRAKE SYSTEM BLEEDING

BR0ED–04

HINT: If any work is done on the brake system or if air in the
brake lines is suspected, bleed the system of air.
NOTICE: Do not let brake fluid remain on painted sur-
faces. Wash it off immediately.

1. REMOVE

RESERVOIR

CAP

Turn the reservoir cap to the “open” side and remove it.

2.

FILL RESERVOIR WITH BRAKE FLUID

Fluid: SAE J1703 or FMVSS NO.116DOT3

BR–8

–

BRAKE SYSTEM

CHECK AND ADJUSTMENT

3.

BLEED MASTER CYLINDER
HINT: If the master cylinder has been disassembled or if the
reservoir becomes empty, bleed the air from the master cylin-
der.

(a) Disconnect the brake lines from the master cylinder.
(b) Slowly depress the brake pedal and hold it.

(c) Block off the outer holes with your fingers, and release the

brake pedal.

(d) Repeat (b) and (c) 3 or 4 times.

4.

BLEED BRAKE LINE

(a) Connect the vinyl tube to the brake caliper.
(b) Depress the brake pedal several times, then loosen the

bleeder plug with the pedal held down.

(c) At the point when fluid stops coming out, tighten the bleeder

plug, then release the brake pedal.

(d) Repeat (b) and (c) until all the air in the fluid has been bled

out.

(e) Repeat the above procedure to bleed the air out of the brake

line for each wheel.

Torque: 11 N

⋅

m (110 kgf

⋅

cm, 8 ft

⋅

lbf)

5.

CHECK FLUID LEVEL IN RESERVOIR
Check the fluid level and add fluid if necessary.

Fluid:

SAE J1703 or FMVSS NO.116DOT3

6.

INSTALL RESERVOIR CAP

(a) Align

the matchmark on the reservoir cap with the matchmark

on the “open” side of reservoir.

(b) Push down on the reservoir cap and turn it clockwise until it

locks.

(c) Check that the matchmark on the reservoir cap is now

aligned with the matchmark on the “close” side of the
reservoir.

–

BRAKE SYSTEM

CHECK AND ADJUSTMENT

BR–9

TRAC CONTROL SYSTEM BLEEDING

BR0EE–03

1.

BLEED TRACTION CONTROL SYSTEM
CAUTION:

•

The fluid is under high pressure, and could spray out with

great force, so exercise caution.

•

When repairing the brake master cylinder or TRAC

system, bleed the air out of the TRAC system.

(a) Connect a vinyl tube to the bleeder plug of accumulator, then

loosen the bleeder plug.

(b) Start the engine to allow the TRAC pump motor to operate

until all the air has been bled out of the fluid.

(c) Tighten the bleeder plug and stop the engine.

Torque: 8.3 N

⋅

m (85 kgf

⋅

cm, 74 in.

⋅

lbf)

(d) Connect a vinyl tube to the bleeder plug of the TRAC

actuator, then loosen the bleeder plug.

(e) Start the engine to allow the TRAC pump motor to operate

until all the air has been bled out of the fluid.

(f) Tighten the bleeder plug and stop the engine.

Torque: 8.3 N

⋅

m (85 kgf

⋅

cm, 74 in.

⋅

lbf)

(g) Check

if

any diagnostic trouble code is output which indicates

trouble. If there is, clear the diagnostic trouble code.

2.

CHECK FLUID LEVEL IN RESERVOIR
Check the fluid level and add fluid if necessary.

Fluid:

SAE J1703 or FMVSS NO. 116DOT3

HINT: Add fluid with the engine idling.

BR–10

–

BRAKE SYSTEM

CHECK AND ADJUSTMENT

PARKING BRAKE CHECK AND
ADJUSTMENT

BR03R–04

1. CHECK THAT PARKING BRAKE LEVER TRAVEL IS

CORRECT
Pull the parking brake lever all the way up, and count the
number of clicks.

Parking brake lever travel at 196 N (20 kgf, 44.1 lbf):

5–8 clicks

If incorrect, adjust the parking brake.

2.

IF NECESSARY, ADJUST PARKING BRAKE
HINT: Before adjusting the parking brake, make sure that the
rear brake shoe clearance has been adjusted.
For shoe clearance adjustment, see page BR–49.

(a) Remove the cup holder.
(b) Using a socket driver and spanner wrench, remove the

adjusting lock nut.
HINT: Tape the socket driver before use.

(c) Turn the adjusting nut until the lever travel is correct.
(d) Install the adjusting lock nut.

(e) Using a socket driver and spanner wrench, tighten the

adjusting lock nut.

Torque: 5.4 N

⋅

m (55 kgf

⋅

cm, 48 in.

⋅

lbf)

(f) Install the cup holder.

–

BRAKE SYSTEM

CHECK AND ADJUSTMENT

BR–11