Is it better to change the brake pads and brake disc at the same time?
This is one of the most frequently asked questions. The answer is YES!!
Have you ever thought, “Brake discs do not need to be changed because they are metal, and only the brake pads need replacement.” or, “I don’t drive on the race circuit and I drive safely on the street so I don’t need it.”
Have you ever taken a look at your brake discs?
Either disc surface appearance become LP record disc, or crack started, people think it is time to replace. In fact, brake disc surface worn smoothly, when outer area (edge) rose up time to replace.
Why do brake discs and brake pads need replacement?
The main reasons are ‘friction heat’, and ‘heat capacity
Relation between Brake disc and brake pad
There is a “heat capacity” which brake disc and pad can store.
If new disc and pad heat capacity as “100”, wear of disc and pad progress its heat capacity will be “90” → “80” →”70″ … and so on to reduce.
Then, heat not stored by brake disc / pad will transferred to calliper or brake fluid to create various heat damages.
The following examples are typical heat damages
·Decrease of brake calliper rigidity
·Early worn disc or brake pads
·Distorted, crack, step worn on disc
·Brake fluid vapor lock, fluid leakage from screw
·Friction material separation by bending of brake pad back plate (backing plate)
To keep heat damage to minimum level, constant confirmation of disc and pad wear status is mostly important.
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