What does a Brake disc do?

The brake disc is a metal disc that is part of a disc brake unit mounted at the wheel hub (modern cars usually have disc brakes all-round). It is mounted on the wheel hub. When you apply the brakes, the brake pad is forced onto the brake disc causing friction and slowing the car down.

How do you know there is something wrong with a Brake Disc?

• When the brake disc vibrates under braking.
• When the car pulls to one side under braking.
• When the disc's surface is not smooth; if it displays grooves, spots or even cracks.
• When the disc's surface has a blue discolourisation.

When should you consider replacing a Brake Disc?

A brake disc will eventually wear out due to the amount of friction with the brake pad. Moreover, the intense heat generated during braking makes the disc thinner and will deform it, at which point the disc will become increasingly inefficient at dispersing heat. Alternatively brake discs can be rendered ineffective by cracks, scars or even rust as well.

If the brake discs have worn out prematurely or if you are experiencing trouble under braking, it is advisable to seek the help of an expert to investigate the problem and, if necessary, replace the discs as soon as possible. Driving with brakes that do not function properly can, of course, lead to dangerous situations on the road.

You should always replace either both the front discs, both the rear discs or all of the discs to ensure a balanced braking experience. Usually it is advisable to change the brake pads simultaneously as they might have been affected by uneven wearing discs (due to scarring or cracking).

Importantly, servicing the brake discs is key to ensure the brakes work correctly and effectively. Always service the brakes according to the guidelines set out by your car's manufacturer.

What happens during a Brake Disc replacement?

• Mechanic will inspect the brake discs.
• If necessary, the brake discs will be replaced.
• Mechanic will advise if the brake pads should be replaced too.
• Mechanic will check the brake system and, if deemed safe, will do a test drive.
• Mechanic will make any adjustments to optimise the braking system.

How much does a Brake Disc Replacement cost?

The cost of a brake disc replacement depends on your car and what parts your car's manufacturer recommends using for the replacement. Find out what you could save by having your brake disc replaced by Clickmechanic, by selecting your car at the top of this page!