Grinding when braking near the front wheels is a sign that it is time to change the brake pads. And the presence of unnecessary, old equipment is a sign that you need to contact a company that accepts scrap heavy equipment. If the vehicle is equipped with an onboard computer, it also signals about this problem. Do not procrastinate with its solution, because the importance of works is comparable with the repair of the running gear of the car. Lingering of time will affect the accelerated deterioration of brake discs and the safety of the driver and passengers.
The pads are made of friction material of great thickness. At its base is a strip of steel. Complete wear of the friction material layer causes the brake disc to rub against the strip when braking. At the same time you hear a characteristic unpleasant sound of metal parts rubbing against each other.
Most foreign cars are equipped with a system for tracking pad wear. A special sensor at the right time will give a signal to the on-board computer, as a result, a light will light up on the panel, which will let you know that you need to take action.
Procedure for replacing the brake pads
You will need a wrench to unscrew the “secret” bolts on the wheel rims. These are often used by car owners to prevent possible theft of car wheels.
Start jacking the car and place a prop. The process will cause one of the wheels in the front to be out of alignment. Push the pads back to the primary position with a screwdriver. Don’t forget that the operation is not done all at once, but gradually and alternately for both wheels. First a little on one wheel, then on the second, then back to the first wheel and so on until it is completely moved to the initial position.
Correctly performed, this will bring the brake piston to its original position. Unscrew aside the brake caliper with the box, it is mounted on guide sleeves. Remove the rubber ring of the brake hose from the bracket and press on the caliper piston with a screwdriver or similar tool to enter the cylinder. Next, unscrew one of the caliper bolts. There are two of them, deal with the one that will allow you to move the brake caliper with the bracket to the side, making way for the pads.
Inspect the degree of evenness and level of wear on the pads. Ideally, the friction layer will wear evenly. Uneven wear indicates that the caliper bracket is not moving properly on the guides. Torn anthers will confirm this. Use graphite grease to replace them with new ones.
Brake pads are sold complete with the correct parts for installation, including paying attention to whether there is grease when you purchase them.
New pads are assembled in the reverse order:
putting the brake caliper in place;
fastening the bolt that has been unscrewed;
installing the wheel;
tightening the nuts;
jacking the car down.
Also work with the second front (rear) wheel. At the end eliminate the backlash between the brake disc with pads and caliper piston – press the “brake” 3-4 times.
If the vehicle is equipped with a rear brake system, the operations for replacing the pads are the same. The only nuance – on the brake piston there are special grooves for the key. With their help it is screwed into the caliper, and not pressed, as in the case described above.