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This is the part of the brake system that actually stops the car. They are usually made of solid cast iron and can be ventilated (depending on vehicle weight and power). The action of stopping is caused by the
friction of the brake pads pressing down hard on the brake discs. Brake discs are subjected to very extreme temperatures and conditions. Over time, the discs can become worn and develop hotspots which will
cause the wheels to wobble (vibration in the steering wheel).
Skimming the discs so that they perfectly match the drive flange again will eliminate issues and prevent the need for replacement.
Discs are corroded or rusty There is brake shudder Brakes feel spongy
These are components of braking systems using brake discs and are steel backing plates with friction material bound to the surface. They make contact with the brake disc in order to stop wheel rotation. Brake
pads should be replaced regularly and are usually equipped with a thin piece of soft metal that causes the brakes to squeal when the pads are too thin.
It is composed of soft but extremely tough and heat-resistant material which is attached to the brake pad or brake shoe (usually using high temperature adhesives or rivets). The brake lining in either
case is the part which actually makes contact with the brake disc or drum.
Brake drums are the alternative to disk brakes. This round, hollow part of the brake mechanism is attached to the wheel and has pressure applied to it by the brake shoes in order to arrest wheel rotation (an alternate system
to using brake discs). This system is sometimes found in the rear brakes of a car, while brake discs are used in the front brakes. Older cars may have this system in the front and back.
As with brake discs, deep scores sometimes get worn into brake drums (unlike brake discs, contact is made on the inside of the brake drum). When this happens, a brake drum can be refinished/skimmed.
These are components of braking systems using brake drums and carry the brake lining which is riveted or glued to the shoe. When the brakes are applied, the shoe moves and presses the lining against the inside of the brake
drum, stopping wheel rotation.
It is a type of hydraulic fluid which turns force into pressure. It must have a very high boiling point to avoid vaporization because, during braking, the brake fluid is subjected to very high temperatures.
As the driver applies the brakes, the fluid is forced into cylinders at each car wheel by the master cylinder, moving a pair of pistons outwards in order to thrust the brake shoes against the brake drums.
The problem with brake fluid is that it is hygroscopic. This means that it is inclined to absorb water very easily (even from the air).
When this happens, the boiling point of the fluid decreases and braking performance is compromised.
Also, the more water the brake fluid absorbs, the more corrosive it becomes and it will eventually cause damage to other parts in the brake system.
This is why your brake fluid needs to be flushed out and replaced.
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