OEM 2006 Toyota 4Runner Brake Master Cylinder

2006 Toyota 4Runner Parts Questions & Experts Answers

• Q: How to overhaul the brake master cylinder on 2006 Toyota 4Runner?

  A: A proper procedure to overhaul the brake master cylinder requires turning off the ignition switch followed by pressing the brake pedal greater than 20 times to empty the power supply system pressure. Wash off the brake fluid spills from painted surfaces during the drainage process. Start the procedure by taking out the front door scuff plate LH, front floor footrest, cowl side trim board LH, instrument panel finish plate, instrument panel finish panel sub-assembly lower and steering column hole cover. Start by eliminating the push rod pin after removing its clip and then unconnect the 3 brake master cylinder connectors before you can detach the 4 brake lines with Special Service Tool: 09023-00101. Using 4 nuts you can extract the brake master cylinder from the installation followed by the brake booster gasket removal. The brake actuator bracket No.1 requires removal with a 5 mm hexagon wrench followed by the detachment of brake master cylinder reservoir sub-assembly through pin removal and screw disconnection before removing the master cylinder reservoir filler cap. The brake actuator hose can be detached by first removing the 3 reservoir grommets followed by sliding the 2 clips. Supporting tool Special Service Tool 09023-00101 enables brake actuator tube No.1 removal before you proceed to disassemble the brake booster w/accumulator pump assembly through wire harness disconnect and plug and screw removal. Secure the brake booster w/accumulator pump assembly inside a vise to remove the brake booster accumulator assembly while discarding the O-ring. This operation must be performed to prevent foreign matter from entering the pump. Use battery leads to inspect brake booster pump motor functionality once the assembly has been connected. Cut the brake booster accumulator assembly from points A to B while clearing all safety procedures. The removal of the master cylinder solenoid involves unfastening its 6 bolts with gasket together with the master cylinder push rod clevis and boot by loosening their lock nuts. To safely replace the brake master cylinder kit start by pushing the piston with a screwdriver before pushing out the C-ring and remove the piston in a straight direction away from the cylinder bore. Apply lithium soap base glycol grease to the piston before installing it together with the snap ring into the brake system. Reinstall the master cylinder boot and push rod clevis ensuring the lock nuts reach 26 Nm torque specification and the master cylinder solenoid reaches 32 Nm torque specification while using a new gasket. The brake booster accumulator assembly must be installed with a new O-ring before torqueing it to 57 Nm while torquing the brake actuator bracket No.3 and brake booster pump bracket No.2 to 7.8 Nm. Secure the brake booster w/accumulator pump assembly and tighten its connections according to specifications. The brake actuator tube No.1 requires installation with Special Service Tool: 09023-00101 before torqueing to 14 Nm while reinstalling both the brake actuator hose and reservoir grommets. The brake master cylinder reservoir sub-assembly requires complete reinstallation while checking that all its components achieve their correct torque specification. You should now install the brake master cylinder while following the step to connect the brake lines and install all components including the steering column hole cover and instrument panel along with the front door scuff plate LH. During brake booster w/accumulator pump assembly and brake line and master cylinder solenoid bleaching the technician will verify brake pedal height along with free play and reserve distance before checking the fluid level in the reservoir and inspecting for leakage from all components and validating master cylinder operability.