To replace the rear brake pads, first determine how much the fluid level is in the brake master cylinder reservoir. If it is half way between the max and min no need to remove any fluid but if it is above mid remove fluid til it is at midway. Then, take off the tyre and wheel assembly and compress Brake Caliper Piston with a large c-clamp over the top of the caliper housing against the back of the outboard pad, fully pressing down until the pistons are compressed back into caliper bores, remove the c-clamp. Unbolt the brake caliper bolts and remove the brake caliper from
Brake Caliper Bracket and suspend it using heavy mechanic's wire keeping the hydraulic brake flexible hose connected. Remove the brake pads and Brake Pad retainers and then examine the caliper and caliper bracket. For installation use a c-clamp to bottom the piston into caliper bore, using old Brake Pad or wooden block to protect the piston and caliper boot. Use a small flat-bladed tool to lift the inner edge of caliper boot to release any trapped air, so that the boot will be below the piston face. Mount the Brake Pad retainers on the caliper bracket with the wear sensor directed at the leading edge of the inner pad when the car travels in the forward direction and then mount the brake pads and the caliper on to the caliper bracket. Replace new brake caliper bolts and tighten them to 108 nm (80 ft. Lbs.), and then replace the tire and wheel assembly. You should do everything with the engine off by gradually applying the brake pedal to around 2/3 of travel distance, releasing it slowly, and repeating the process until a firm pedal is achieved in order to ensure that the caliper pistons and pads are seated to their required dimensions. Lastly, top off the master cylinder reservoir if needed, with clean break fluid, and burnish the pads and the rotors.