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The manufacturer's bedding schedule shall ensure a minimum of 80 % surface contact area for pad assemblies without exceeding a surface temperature of 300 °C and 70 % surface contact area for the leading shoe assemblies without exceeding a surface temperature of 200 °C.
The test schedule comprises a number of consecutive braking cycles each containing χ braking intervals of 5 seconds brake applied followed by 10 seconds brake released.
The following two methods may be used alternatively:
The hydraulic pressure p under the piston(s) of the calliper shall be constant following the formula:
=
150 Nm for A k ≤ 18,1 cm 2
=
300 Nm for A k > 18,1 cm 2
=
area of calliper piston(s)
=
effective radius of disc
No of cycle | Number of brake applications χ | Initial brake rotor temperature (°C) y | Maximum brake rotor temperature (°C) | Forced cooling |
---|---|---|---|---|
1 | 1 × 10 | ≤ 60 | open | no |
2-6 | 5 × 10 | 100 | open (350) | no |
7 | 1 × 10 | 100 | open | yes |
The mean contact pressure at the brake lining working surface shall be constant at 22 ± 6 N/cm 2 calculated for a static brake without self-energising.
No of cycle | Number of brake applications χ | Initial brake rotor temperature (°C) | Maximum brake rotor temperatur (°C) | Forced cooling |
---|---|---|---|---|
1 | 1 × 10 | ≤ 60 | 200 | yes |
2 | 1 × 10 | 100 | open | no |
3 | 1 × 10 | 100 | 200 | yes |
4 | 1 × 10 | 100 | open | no |
This method applies only for pad assemblies. The brake torque shall be constant within a tolerance of ± 5 % and adjusted to guarantee the maximum brake rotor temperatures given in the table below.
No of cycle | Number of brake applications χ | Initial brake rotor temperature (°C) y | Maximum brake rotor temperature (°C) | Forced cooling |
---|---|---|---|---|
1 | 1 × 5 | ≤ 60 | 300-350 | no |
2-4 | 3 × 5 | 100 | 300-350 | no |
5 | 1 × 10 | 100 | 500-600 | no |
6-9 | 4 × 5 | 100 | 300-350 | no |
10 | 1 × 10 | 100 | 500-600 | no |
11-13 | 3 × 5 | 100 | 300-350 | no |
14 | 1 × 5 | ≤ 60 | 300-350 | no |
Friction behaviour is determined from the brake torque noted at selected points in a test schedule. Where brake factor is constant, e.g. a disc brake, brake torque may be translated to coefficient of friction.
μ op ± 15 % of registered value
μ min ≥ registered value
μ max ≤ registered value
M mean ± 20 % of registered value
M hot ≥ registered value.]
Textual Amendments
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