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Effect of Holes on Brake-Bleeding Performance Improvement in the EPB Caliper

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Abstract

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.

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Abbreviations

p0 :

reference liquid pressure (absolute), bar

ρ0 :

reference liquid density, kg/m3

k0 :

reference bulk modulus, bar

n:

density exponent

p:

liquid pressure (absolute), bar

ρ:

liquid density at pressure, p, bar

k:

bulk modulus at pressure, p, bar

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Acknowledgement

This work was supported by Mun-Seong Kim and Seung-Woo Han at the MBS R&D Center in the Mando Corporation.

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  1. Mando Global R&D Center, Mando Corporation, 21 Pangyo-ro 255beon-gil, Bundang-gu, Seongnam-si, Gyeonggi, 13486, Korea

    Jang-oh Mo

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  1. Jang-oh Mo
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Correspondence to Jang-oh Mo.

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Mo, Jo. Effect of Holes on Brake-Bleeding Performance Improvement in the EPB Caliper. Int.J Automot. Technol. 21, 319–328 (2020). https://doi.org/10.1007/s12239-020-0030-y

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  • DOI: https://doi.org/10.1007/s12239-020-0030-y

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