Rear

If a visual inspection does not adequately determine the condition of the lining, a physical check will be necessary. To check the amount of lining wear, remove the wheel and tire assemblies, and the calipers.
Remove the rear disc brake shoes. Refer to Rear Disc Brake Shoe Removal Disc Brake System, Brake Shoes, Removal and installation for the required procedure.
The combined brake shoe and lining material thickness should be measured at the thinnest part of the assembly.
When a set of brake shoes are worn to a total thickness of approximately 3.0 mm they should be replaced.
Replace both brake shoe assemblies (inboard and outboard). It is necessary that both rear wheel sets be replaced whenever brake shoe assemblies on either side are replaced.
If the brake shoe assemblies do not require replacement, reinstall, the assemblies making sure each brake shoe is returned to the original position. Refer to Rear Disc Brake Shoe Installation in Brake Pad, Removal and Installation for the required procedure.

CALIPER INSPECTION
Check for brake fluid leaks in and around boot area and inboard lining, and for any ruptures, brittleness or damage to the piston dust boot. If the boot is damaged, or a fluid leak is visible, disassemble caliper assembly and install a new seal and boot, and piston if scored. Refer to Disc Brake System, Brake Caliper, Disassembly and Assembly.
Check the guide pin dust boots to determine if they are in good condition. Replace if they are damaged, dry, or found to be brittle.