Technical Articles

To continue, we would like to explain on caliper piston which deeply related to brake squeal. Caliper piston is not only for brake squeal, but also related in brake problem, however over looked without questioning often. Firstly, please carefully look at the illustration of caliper piston.

As shown in the illustration, caliper piston being held in cylinder body with piston seal.
Then, by elasticity by the piston seal, pad to be pulled back when brake released, however, such elasticity lost releasing between pad and disc become poor, drag start.
Moreover, not only such, vibration absorption become poor, pad vibration can easily transferred to caliper itself, encourage squeal.
Now, it is understood that piston seal or dust boot being the important comportment, and when they deteriorated various harming occur but, most people have never experienced replacing them. Generally, it being said as replace once at each 100,000km run, depend upon living area or driving style. For those drive pretty hard need quicker replacement, it is best to replace once every 5 running events for circuit run drivers. Who never replaced seal (boot) once, people with longer running distance hearing problems such as squeal etc, we recommend replacement. Possibility of curing of symptoms is very high.

Surely you will be surprised to see such parts may cause the brake squeal. But, observation at these detracted parts make you understood. Questioning on replaced parts is not fault, and natural idea, it is very short minded to question replaced parts alone. At the same time with inspecting replaced parts, check for abnormality on pars not replaced, check for deteriorated parts may be the shortest way to solve brake squeal.