Toyota 47730-06040-84
Cylinder Assembly, Disc

Begin brake caliper maintenance by first taking apart all components starting with the removal of sliding bushing and 2 dust boots then main pin boot followed by set ring and cylinder boot using a screwdriver. Use compressed air to extract the piston through the caliper while maintaining distance between your fingers and the piston. Firstly position cloth material in between both components prior to operation. The piston seal needs to be removed through screwdriver use. A ruler should be used to check the pad lining thickness during inspection as the standard length is 10.0 mm but the minimum is 1.0 mm; pad replacement is necessary if the pads reach the minimum threshold or show evidence of serious wear. The disc measurement using a micrometer should establish 10.0 mm (0.394 inch) standard thickness as the minimum requirement is 9.0 mm (0.354 inch); when the disc thickness hits the minimum or shows damages, it needs replacement or grinding. Use a dial indicator focused at the outer edge 10 mm (0.39 inch) to measure disc runout with a maximum allowable 0.15 mm (0.0059 inch). Further testing should check bearing play and axle hub runout that requires possible adjustment or grinding of the disc. Shipbuilders should remove two bolts and the torque plate followed by hub nuts and disc before reinstalling the disc with its original position turned 1/5 degrees and torque the hub nuts to 103 Nm (1,050 kgf-cm, 76 ft. lbs.). Measure hub position runouts one more time before selecting the disc for each position based on minimum measurement results of less than 0.15 mm (0.0059 inch). However, if the minimum measurement result exceeds 0.15 mm (0.0059 inch), replace the current disc and repeat the measurement. Place the torque plate afterward tightening all mounting bolts to 47 Nm (475 kgf-cm, 34 ft. lbs.). The reassembly procedure starts by applying lithium soap base glycol grease to specified parts and then installing the piston seal without twisting it before adding the piston and cylinder boot and set ring and main pin boot and finishing with the 2 dust boots and sliding bushing.

Remove 2 slide pins with a torque of 43 Nm (440 kgf-cm, 32 ft. lbs.).

Remove the union bolt and 2 gaskets from the caliper, ensuring to torque the connection to 29 Nm (300 kgf-cm, 22 ft. lbs.), and use a container to catch any draining brake fluid.

Measure the pad lining thickness, which should be 10.0 mm (0.394 inch) as standard and a minimum of 1.0 mm (0.039 inch).

Securely insert the flexible hose lock into the caliper's lock hole.

Begin by removing the set ring and cylinder boot using a screwdriver.

Reverse the removal steps, fill the brake reservoir with brake fluid, bleed the brake system, and check for leaks.

Reverse the removal steps, ensuring to fill the brake reservoir with brake fluid, bleed the brake system, and check for any fluid leaks.

Place a cloth between the piston and caliper and take care not to place fingers in front of the piston.

Reverse the removal steps, fill the brake reservoir with brake fluid, bleed the brake system, and check for any fluid leaks.

Reverse the removal steps, ensuring to fill the brake reservoir with brake fluid, bleed the brake system, and check for any fluid leaks.

Remove the 3 hub nuts and install the rear wheel, torquing it to 103 Nm (1,050 kgf-cm, 76 ft. lbs.).