There isn't a trailing edge to normal car pads. You get either four identical or two of one and two of another in the event that the inner and outer on a wheel are different(rare). When you fit them one set will effectively be contacted in the direction of rotation opposite to the other side (not the discs obviously but in relation to the pad positions. In other words if, part way through use, you were to swap an identically positioned pad from the left to the right wheel the discs would contact the pad in a direction of rotation opposite to the original fit positions.
So there is, effectively, no perceived trailing or leading edge.
pad brakes are disc brakes, it's known as changing brake pads for disc setup and changing brake shoes with drum brake setup.
It depends if 4 WD or just FWD and what year model Generally: FRONT: Brake pad minimum thickness 3.0 mm (0.118 inch) Brake pad maximum taper wear (in any direction) 3.0 mm (0.118 inch) Brake disc minimum thickness (disc-drum system) 22 mm (0.866 inch) Brake disc minimum thickness (4-wheel disc brake system) 24 mm (0.944 inch) REAR: Brake Pad Brake pad minimum thickness 3.0 mm (0.118 inch) Brake pad maximum taper wear (in any direction) 3.0 mm (0.118 inch) Brake Disc Brake disc minimum thickness 11.0 mm (0.433 inch)
the only way you change brake pad or disc
use a pad wear indicator :)
Bring to a mechanic
To change rear disc brake pad on a 2004 hydunai Santa Fe, find replacement disc brake pads, and then locate the user manual of your vehicle. Follow the instructions on the manual.
Do not let them get down to the rivets. On disc brakes they have a warning tab installed.
Lift the car on the car jack, remove the tire, remove the brake shoe/caliper, remove the brake pad. Put in the new brake pad, replace the brake shoe/caliper, put the tire back on the car, and lower the car to the ground.
The brakes work on the principal of friction. I will be using a disc brake example, however the principal remains the same on every style of brake. The driver hits the brake pedal, which pushes a hydraulic cylinder. This forces brake fluid to move further down the brake lines, creating pressure where the line ends. This pressure pushes the brake pad into the disc, creating a lot of friction. The harder the pedal is pressed, the more the brake pad is forced into the disc, creating more friction. This friction then stops the wheels from turning as fast, and that stops the car from moving.
Disc Brake Parts consist of the following: Inner Shim B Inner Shim A Wear Indicator Outer Pad Shim Caliper Bracket Pad Retainers Caliper Bracket Pin Boots Piston Piston Boot Brake Pads Piston Seal Pin A Pin B Bushing Brake Hose Sealing Washers Bleed Screw Caliper Body
The piston retracts by turning it back in. You will need a Disc Brake Pad Spreader (Part Number: 648412) and a Disc Brake Piston Tool (Part Number: 648410) found at Advance Auto Parts. The Brake Piston Tool looks like a Rubik cube. Simply line up the knobs into the piston slots and place the disc brake pad spreader between the caliper and brake piston tool. Apply slight pressure on the piston via the pad spreader and turn the brake piston tool with a screw driver while continuing to apply pressure on the brake piston tool. From what I have read they could retracted by turning either clockwise or counterclockwise.
NO! No...no...no...! Do not put any grease on your brake discs, copper grease is used to put on the 'back' of the brake pads (not the part of the pad that comes into contact with the disc).