| EFFECT OF HOLES ON BRAKE-BLEEDING PERFORMANCE IMPROVEMENT IN THE EPB CALIPER |
| Jang-oh Mo |
| Mando Corporation |
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| ABSTRACT |
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Brake-bleeding is the process of removing air bubbles present on hydraulic brake systems. In particular, the existence of air content within the EPB caliper deteriorates bleeding performance, causing a high-level compressibility of the brake fluid. This paper presents numerical and experimental investigations of the effect of holes on brake-bleeding performance improvement for three different nut-spindle models included in the driving-part model of the EPB caliper. In the present paper, compressible brake-fluid simulations with pressure rise and drop ranging in pressure from 0 to 100 bar are modelled with a transient numerical approach utilizing a three-phase mixture model and standard k-ω turbulence model. The experimental verification of the effect of the holes with a constant 2 mm diameter, determined from the simulation results, was conducted using a standard test device at Mando Corporation. In conclusion, the experimental results prove that the effect of the holes has considerable impact on the performance improvement. |
| Key Words:
Effect of holes, Electric parking brake (EPB) caliper, Trapped air, Brake-bleeding performance |
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Corresponding Author.
Jang-oh Mo , Email. 
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