Brake Master Cylinder Sub-ASSY: Overhaul

1. Disconnect the level warning switch connector.
2. w/o ABS:

   Using SST, disconnect the 5 brake tubes from the brake master cylinder.

   SST 09023-00101

   Fig 1: Identifying Brake Master Cylinder Tubes (W/o ABS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. w/ ABS:

   Using SST, disconnect the 6 brake tubes from the brake master cylinder.

   SST 09023-00101

   Fig 2: Identifying Brake Master Cylinder Tubes (W/ ABS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. w/o ABS:

   Remove the 2 nuts, pull out the 3-way and brake master cylinder sub-assy.

5. w/ ABS:

Remove the 2 nuts, pull out the 2-way and brake master cylinder sub-assy.

Fig 3: Identifying Brake Master Cylinder Sub-Assy Nuts

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Pull out the master cylinder reservoir filler cap assy.

1. Pull out the master cylinder reservoir strainer.

1. Remove the screw and pull out the master cylinder reservoir sub-assy.

1. Remove the 2 master cylinder reservoir grommets.

1. Place master cylinder in vise.
2. Remove the O-ring.
3. Push in the piston and remove the snap ring with snap ring pliers.
   Fig 4: Installing Piston And Removing Snap Ring Using Snap Ring Pliers

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Push in the piston and remove the piston stopper bolt and gasket.
5. Remove the No. 1 piston sub-assy, pulling straight out not at an angle.
   NOTE: If pulled out at an angle, there is a possibility that the cylinder bore could be damaged.
   Fig 5: Identifying Piston Stopper Bolt

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Place a waste cloth and 2 wooden blocks on the work table and check phrasing lightly edges until the No. 2 piston sub-assy drops out of the cylinder.

HINT:

Make sure the distance (A) from the rag the top of the blocks is at least 100 mm (3.94 in.).

Fig 6: Removing No. 2 Piston Sub-Assy From Cylinder

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Place master cylinder in vise.
2. Remove the O-ring.
3. Push in the piston and remove the snap ring with snap ring pliers.
   NOTE: If pulled out at an angle, there is a possibility that the cylinder bore could be damaged.
   Fig 7: Installing Piston And Removing Snap Ring Using Snap Ring Pliers

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Push in the piston with a screwdriver, and remove the straight pin by turning over the cylinder body.

   HINT:

   Tape the screwdriver tip before use.

5. Remove the No.1 and No. 2 piston sub-assy and 2 springs by hand, pulling straight out, not at an angle.

Fig 8: Removing Piston Sub-Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the cylinder bore for rust or scoring.

1. Place master cylinder in vise.
2. Apply the lithium soap base gyrol grease on new No.1 and No.2 piston sub-assy.
3. Install the No.2 and No.1 piston sub-assy.
   NOTE:

   • If the piston is inserted at an angle, there is a possibility that the cylinder bore could be damaged.
   • Be careful not to damage the rubber lips on the pistons.
4. Push in the piston and install a new gasket and a new piston stopper bolt.

   Torque: 10 N.m (100 kgf.cm, 7 ft.lbf) 

   Fig 9: Identifying Piston Stopper Bolt

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Push in the piston and install the snap ring with snap ring pliers.
6. Apply the lithium soap base gyrol grease on a new O-ring and install the O-ring to the master cylinder.

Fig 10: Installing Piston And Snap Ring With Snap Ring Pliers

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Place master cylinder in vise.
2. Apply the lithium soap base glycol grease on new No.1 and No.2 piston sub-assy.
3. Install the No.2 and No.1 piston sub-assy.
   NOTE:

   • If the piston is inserted at an angle, there is a possibility that the cylinder bore could be damaged.
   • Be careful not to damage the rubber lips on the pistons.
4. Install the straight pin.

   HINT:

   Insert the No.2 piston with the groove positioned horizontally.

   Fig 11: Installing Straight Pin

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Push in the piston and install the snap ring with snap ring pliers.
6. Apply the lithium soap base glycol grease on a new O-ring and install the O-ring to the master cylinder.

Fig 12: Installing Piston And Snap Ring Using Snap Ring Pliers

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Apply the lithium soap base glycol grease on the 2 master cylinder reservoir grommets.
2. Install the 2 master cylinder reservoir grommets to the master cylinder reservoir sub-assy.

1. Install the master cylinder reservoir sub-assy to the master cylinder with the screw.

1. Install the brake master cylinder reservoir strainer.

1. Install the brake master cylinder reservoir filler cap assy.

1. Apply SST to the master cylinder.

   SST 09737-00013

   Fig 13: Applying SST To Master Cylinder

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Set SST, on the master cylinder, lower the pin of the SST until it slightly touches the piston.
3. Apply the chalk to the flat surfaced tip of the SST pin.
4. Turn SST upside down and place it clearance between the brake booster and SST.

   Clearance: 0 mm (0 in.) 

   HINT:

   • If there is a clearance between the SST main body and the booster shell. It means that the specified value, and no chalk attachment on the booster push rod means that it is more than the specified value.
   • Brake booster push rod clearance before shipment is adjusted to be +/- 0.105 mm (+/- 0.004 in.).
5. Using SST, adjust the booster push rod length until the push rod lightly touches the pin head.

   SST 09737-00020

   Fig 14: Adjusting Booster Push Rod Length Using SST

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. w/o ABS:

   Install the master cylinder sub-assy and 3-way with the 2 nuts.

   Torque: 13 N.m (130 kgf.cm, 9 ft.lbf) 

2. w/ ABS:

   Install the master cylinder sub-assy and 2-way with the 2 nuts.

   Torque: 13 N.m (130 kgf.cm, 9 ft.lbf) 

   Fig 15: Identifying Master Cylinder Sub-Assy Nuts

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. w/o ABS:

   Using SST and connect the 5 brake tubes to the master cylinder sub-assy.

   SST 09023-00101

   Torque: 15 N.m (155 kgf.cm, 11 ft.lbf) 

   Fig 16: Identifying Master Cylinder Brake Tubes (W/o ABS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. w/ ABS:

   Using SST and connect the 6 brake tubes to the master cylinder sub-assy.

   SST 09023-00101

   Torque: 15 N.m (155 kgf.cm, 11 ft.lbf) 

5. Connect the level warning switch connector.

Fig 17: Identifying Master Cylinder Brake Tubes (W/ ABS)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SST 09023-00101