Lexus SC300 / Lexus SC400. Service manual — part 246

PREPARATION

SST (SPECIAL SERVICE TOOLS)

BR03J–04

RECOMMENDED TOOLS

BR0EB–01

BR–4

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BRAKE SYSTEM

PREPARATION

EQUIPMENT

BR03K–03

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Torque wrench

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Micrometer

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Brake disc

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Dial indicator

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Brake disc

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Vernier calipers

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Brake disc

LUBRICANT

BR03L–03

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Item

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Capacity

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Classification

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Brake fluid

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––

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SAEJ1703 or FMVSS No. 116, DOT 3

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BRAKE SYSTEM

PREPARATION

BR–5

TROUBLESHOOTING

BR03M–06

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.

BR–2

1,

29

,

3

7

BR–7

BR–12

BR–49

BR–1

1

BR–19

BR–44

BR–44

4

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–2

1,

29

,

37

BR–8

BR–6

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BRAKE SYSTEM

TROUBLESHOOTING

CHECK AND ADJUSTMENT

BR0EC–07

BRAKE PEDAL CHECK AND
ADJUSTMENT

1.

CHECK THAT PEDAL HEIGHT IS CORRECT

Pedal height from asphalt sheet:

150.4–160.4 mm (5.92–6.31 in.)

If the pedal height is incorrect, adjust it.

2.

IF NECESSARY, ADJUST PEDAL HEIGHT

(a) Disconnect the connector from the stop light switch.
(b) Loosen the stop light switch lock nut and remove the stop

light switch.

(c) Loosen the push rod lock nut.
(d) Adjust the pedal height by turning the pedal push rod.
(e) Tighten the push rod lock nut.

Torque: 25 N

⋅

m (260 kgf

⋅

cm, 19 ft

⋅

lbf)

(f)

Install the stop light switch and turn it until it lightly contacts
the pedal stopper.

(g) Turn the stop light switch back one turn.
(h) Check

the clearance (A) between stop light switch and pedal.

Clearance:

0.5–2.4 mm (0.02–0.09 in.)

(i)

Tighten the stop light switch lock nut.

(j)

Connect the connector to the stop light switch.

(k) Check that the stop lights come on when the brake pedal is

depressed, and go off when the brake pedal is released.

(l)

After adjusting the pedal height, check the pedal free–play.
HINT: If clearance (A) between the stop light switch and the
brake pedal stopper has been adjusted correctly, the pedal
freeplay will meet the specifications.

3. CHECK

THAT

PEDAL

FREEPLAY

IS

CORRECT,

AS

SHOWN

(a) Stop the engine and depress the brake pedal several times

until there is no more vacuum left in the booster.

(b) Push in the pedal by hand until the beginning of the second

point of resistance is felt, then measure the distance, as
shown.

Pedal freeplay:

1–6 mm (0.04–0.24 in.)

If incorrect, check the stop light switch clearance. And if the
clearance is OK, then troubleshoot the brake system.
HINT: The freeplay to the first point of resistance is due to the
play between the clevis and pin. It is 1–3 mm (0.04–0.12 in.)
on the pedal.

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BRAKE SYSTEM

CHECK AND ADJUSTMENT

BR–7