Lexus SC300 / Lexus SC400. Manual - part 248

MASTER CYLINDER

MASTER CYLINDER REMOVAL

BR0EF–03

1.     w/ TRAC:

DRAIN OUT HIGH PRESSURE FLUID

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

actuator, then loosen the bleeder plug with the ignition switch
in the OFF position.

CAUTION: The fluid is under high pressure, and could spray

out with great force, so exercise caution.

(b)  Tighten the plug when fluid stops flowing out.

2. 

DISCONNECT LEVEL WARNING SWITCH CONNECTOR

3. 

DRAW OUT FLUID WITH SYRINGE

NOTICE: Do not let brake fluid remain on a painted surface.

Wash it off immediately.

4. 

DISCONNECT BRAKE LINES
Using SST, disconnect the brake lines from the master cylin-
der.
SST 09023–00100

BR–12

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BRAKE SYSTEM

MASTER CYLINDER

5. 

REMOVE MASTER CYLINDER

(a)  Remove the nuts and clamp.
(b)  Remove the master cylinder and gasket from the brake

booster.

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BRAKE SYSTEM

MASTER CYLINDER

BR–13

COMPONENTS

BR03T–05

MASTER CYLINDER DISASSEMBLY

BR0EG–05

1. 

REMOVE MASTER CYLINDER BOOT
Using a screwdriver, remove the master cylinder boot.

2. 

REMOVE RESERVOIR CAP AND STRAINER

(a)  Turn the reservoir cap the “open” side and remove it.
(b)  Remove the strainer.

BR–14

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BRAKE SYSTEM

MASTER CYLINDER

3. REMOVE 

RESERVOIR

Remove the set screw and pull out the reservoir.

4. 

REMOVE 2 GROMMETS

5. 

PLACE CYLINDER IN VISE

6. w/ 

TRAC:

REMOVE NO.1 PISTON STOPPER BOLT
Using a screwdriver, push the pistons in all the way and re-
move the No.1 piston stopper bolt and gasket.
HINT: Tape the screwdriver tip before use.

7. 

REMOVE NO.2 PISTON STOPPER BOLT
Using a screwdriver, push the pistons in all the way and re-
move the No.2 piston stopper bolt and gasket.

8. REMOVE 

PISTONS

(a)  Push in the piston with a screwdriver and remove the snap

ring with snap ring pliers.

(b)  Remove the No. 1 piston and spring by hand, pulling straight

out, not at an angle.

NOTICE: If pulled out at an angle, there is a possibility that the

cylinder bore could be damaged.

(c) Place 

a 

rag and 2 wooden blocks on the work table and lightly

tap the cylinder flange against the block edges until the piston
drops out of the cylinder.
HINT: Make sure the distance (A) from the rag to the top of
the blocks is at least 100 mm (3.94 in.).

MASTER CYLINDER COMPONENTS
INSPECTION

BR03V–05

HINT: Clean the disassembled parts with compressed air.

1. 

INSPECT CYLINDER BORE FOR RUST OR SCORING

2. 

INSPECT CYLINDER FOR WEAR OR DAMAGE
If necessary, clean or replace the cylinder.

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BRAKE SYSTEM

MASTER CYLINDER

BR–15