How to Replace Brake Pads, Brake Disc Machining & Braking System Efficiency Testing

When testing the performance of the braking system on a car, the first thing that needs to be done is a thorough road test to check the various components of the braking system and make sure they are all working correctly and there’s no shutter or vibration coming through the brakes.

A device called brake tester is used to check the braking efficiency of a car. The break tester gets connected to the brake pedal of the car and when certain speed is reached, the brakes are hit fairly hard, and the brake tester will print out the performance on the brakes under hard braking.

In the video below, we’ll show you few of the components of the braking system, replacing brake pads and machining the brake disc.

You need to be very careful who fits your brakes and how they go about doing them, as if the brake pads are put in incorrectly, they might crack like in the video and cause a serious road accident.

Every disc has a minimum thickness it is allowed to be. Before replacing the brake pads, a mechanic must determine the thickness of the brake disc, and if it can be machined or not. Without a proper calliper measuring tool and knowing the thickness of the brake disc, the brake pads shouldn’t be changed.

It is illegal and quite dangerous to put brake pads on a disc that is too thin.

If the thickness is acceptable according to the manual, the brake disc needs to be machined using brake disc machining device, that has an electric motor, connects to the hub of the car, and it spins the hub around. When it spins the hub around, there are two jaws that clamp around the disc, and machine a certain amount of that disc.

After the disc is machined, the calliper pistons have to be pushed in with a special tool and they have to be checked to make sure that they are not seizing inside the bores or leaking. There are also two slides at the calliper slides that must be checked and lubricated, because they can bind up and cause many problems with your brakes.

Once the brake pads are in place and the wheel is back on, the brake pedal will now have to be applied several times before the car is moved because the brake pedal will be very low as the calliper pistons have been pushed right back in.

At the very end, the car needs to be driven again, just to make sure everything is performing the way it should be.

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