|
1. Organic pads usually contain no metallic parts;
2. Semi-metallic pads are usually a mixture of organic and metallic parts;
3. Sintered metal pads are made with metal.
The Society of Automotive Engineers (SAE) has a grading system for brake pad friction material (SAE J866). The test applies the brake pads to a rotating drum until the temperature of the pads reaches 650 degrees F. In general terms, the test assigns a two-letter code where the first letter designates normal temperature friction and the second letter designates hot friction. The letters correspond to numbers in the table at left.
This means that "HH" pads have a normal and hot friction coefficient of over 0.55 as defined by the SAE test. Thus there is no such designation as "HHH" or "HHH Plus" pads that you may see in an advertisement!
SAE Brake Pad
| C |
>= 0.15 |
| D |
>0.15, <=0.25 |
| E |
>0.25, <=0.35 |
| F |
>0.35, <=0.45 |
| G |
>0.45, <=0.55 |
| H |
>0.55 |
| Z |
Unclassified |
Friction Rating System as belows:
|
