Brake disc rectification is a method in which brake discs or drums are placed on a precision lathe. This is done to subject their surfaces to precisely controlled, millimetric wear and tear, thereby eliminating irregularities that develop on the brake pads with use.
Once the surface is completely smooth again after rectification, the brake pads are usually replaced with new ones. This restores braking efficiency and eliminates vibrations or jolts when braking, which is vitally important if optimal braking is required when necessary.
When should brake disc or drum rectification process?
This procedure is usually performed when there are noises or squeals when braking, as well as when braking becomes intermittent, that is, when braking produces jerks and/or vibrations caused by the disc being uneven or warped to a millimeter. It is also commonly resurfaced when the brake pad has become covered with rust due to prolonged disuse.
Can all discs and drums be rectified?
This will depend on the condition of the discs or drums. They should not be severely deformed, nor should their thickness be excessively reduced due to wear or previous grinding. This is why there are tables with tolerance values for acceptable ranges for following this process. If grinding is not possible for the reasons mentioned above, the brake discs or drums should be replaced with new ones.
Where are brakes rectificated?
Generally, specialized brake services have the machine (a lathe) and the knowledge to perform this procedure. Larger auto repair shops, where they have both mechanics and electricity, also offer brake service. Smaller shops that don’t have this service have external grinding machines that do the job, taking the brake discs and drums. It’s always a good idea to ask your trusted mechanic if it’s worth grinding or if, due to wear, replacing the discs or drums is the only option.
