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Effect of hydraulic brake pipe inner diameter on vehicle dynamics

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Abstract

During the operation of the brakes the behavior of the brake fluid in the brake piping is one element that has a large effect on feel and on transient pressure characteristics. In the present study investigates the effect of fitting a brake pipe with different inner diameters to each wheel at the rear axle on the brake performance and vehicle dynamics. Theoretical analysis and road tests were conducted and applied on a Fiat 128 vehicle to investigate the changes in brake efficiency and brake force balance. The theoretical and experimental results showed the improvement of the car brake efficiency and brake balance when fitting a brake pipe with the same inner diameter (without orifice) for each wheel.

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Abbreviations

A wc :

wheel cylinder cross-section area, m2

a :

distance from vehicle center of gravity to the front wheels center, m

b :

distance from vehicle center of gravity to the rear wheels center, m

B f :

brake factor

F xwr :

brake force on one wheel at rear axle, N

F xr :

brake force on rear axle, N

K B :

brake constant

P r :

rear axle pressure, N/m2

r:

drum or effective disc radius, m

η c :

wheel cylinder efficiency

R:

wheel radius, m

F xf ,max :

maximum brake force on front axle, N

F xr ,max :

maximum brake force on rear axle, N

F xlf :

braking force on front left wheel, N

F xrf :

braking force on rear right wheel, N

F xrl :

braking force on rear left wheel, N

F xrr :

braking force on rear right wheel, N

F zlf :

normal force on front left wheel, N

F zlr :

normal force on rear left wheel, N

F zrf :

normal force on front right wheel, N

F zrr :

normal force on rear right wheel, N

h :

height of center of gravity, m

L :

wheel base, m

W :

vehicle weight, n

Z :

deceleration [g-units]

μ :

coefficient of ground adhesion

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Author information

Authors and Affiliations

  1. 10th of Ramadan City, 6th October Branch, Higher Technological Institute, Cairo, Egypt

    S. Abu A. Albatlan

Authors
  1. S. Abu A. Albatlan
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Correspondence to S. Abu A. Albatlan.

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Albatlan, S.A.A. Effect of hydraulic brake pipe inner diameter on vehicle dynamics. Int.J Automot. Technol. 16, 231–237 (2015). https://doi.org/10.1007/s12239-015-0025-2

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  • DOI: https://doi.org/10.1007/s12239-015-0025-2

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