Brake squeal is very simply a high pitched vibration caused by friction. This energy is transferred from the friction surface between the pad and disc. The levels of noise created can be affected by various factors including structural integrity of the car parts around the brakes, friction levels of the pad material and even nut/bolt torque setting in suspension.

Brake squeal is generally very hard to remove without changing parts. The main factor is friction which means the higher you go with friction, the more likely some noise will be present.

Normally it is totally acceptable for brake noise on a competition vehicle. Street based vehicles tend to be less happy to accept some noise!