1) when you need to replace your brake? and how to check ?
Replace your brake pads if thickness is 2.4 mm (0.09 in.) or below. There are brake pad wear sensors that trigger a warning light when pads reach the minimum, however the sensor is only located on one brake per axle. This leaves 3 brake pads on each axle that is not monitored by the warning system. This is why periodic inspections are required.
2) installation process:
Necessary preliminary tasks:*Remove front brake discs
Release screws (1) and remove brake guard plate (2).
Using a flathead screwdriver, remove brake caliper anti-rattle spring (green arrow) by prying out while securing with hand. The spring can pop off and go flying, be sure to hold it steady.
Pull brake pad wear sensor (green arrow) out of brake pad out of driver side brake pad. Be very careful as sensor tends to break when removed. I like to use a pair of needle nose pliers to pull sensor out.
Using a flathead screwdriver, slowly press brake caliper piston in. This allows brake caliper to be pulled off brake rotor easily. I like to pry between the outer brake pad and brake rotor. This way there is less chance of damaging the caliper piston.
Remove rubber plugs from brake caliper mounting fasteners. (green arrows)
Next, using a 6mm Allen bit, remove brake caliper mounting fasteners. (green arrows)
Working behind front strut (yellow arrow), open plastic door (green arrow) for brake pad wear sensor electrical connector.
Disconnect brake pad wear sensor electrical connector by pressing release tab and pulling apart. Remove brake caliper from mounting bracket. Do not allow brake caliper to hang from brake hose. Secure to vehicle using a piece of a metal coat hanger.
Remove brake pads from brake caliper. Then press piston back into caliper using a brake caliper piston tool. Install new brake pads into caliper and caliper mounting bracket. Install caliper to mounting bracket and tighten fasteners. Then install rubber plugs. Connect pad wear sensor electrical connector and route wiring harness as before. Install brake pad wear sensor into brake pad. Install brake pad anti-rattle clip by pressing into caliper and pushing down to confirm it is properly seated. Once calipers are installed and fasteners are tight, press brake pedal to pump brakes up. Once brake pedal is hard to push, install wheels and check brake operation.
