Question about 2007 Hyundai Accent GS Hatchback

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Hyundai Accent 2007 - Rear brake problem !

Hallo! My car is an Hyundai Accent 1,5CRDi - 2007 / 81KW- unfortunately without ABS & EBD(Turkey-0068 series, with manual transmission ; compact class-1260Kg without driver, that mean (with driver 80Kg):890Kg front train - 450Kg rear train .Dimmension of tyre 185/65 R14 H Pirelli P6000/2,1bar, in standard.) In this case,I need to improve a more efficient rear brake (drum & shoe brake) solution.To fix this issue I looking for a pair of proportioning valves hwo works directly on the master cilinder of CBS.The proportion (front/rear) brake distribution efficiency must be 60/40.The producer of my car (Hyundai) specify in the workshop manual an distribution like this: at min.pressure 35Kg/cm2 front - 30Kg/cm2 rear , and for a max.pressure 70Kg/cm2 front - 48Kg/cm2 rear.
Thank's for your help!

P.S. I've changed (last week) the proportioning valves (genuine Hyundai parts 58775-1G000) in an authorize Hyundai service, but the problem persist ! Notify me, please, at :

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Brake booster specs ("Save picture as" to another location and use ZOOM IN utility to have a better view.
Hyundai Accent 2007 - Rear brake problem ! - db17710.gif

Posted on Jul 17, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 17, 2008

    proportioning valve

    This table shows characteristics of the proportioning valve as the pressure increases.

    (Output of master cylinder)

    (Output of proportioning valve)

    A : 35 kg/cm²
    (3.43 MPa, 497 psi)

    A' : 35 kg/cm²
    (2.94 MPa, 427 psi)

    B : 70 kg/cm²
    (6.86 MPa, 995 psi)

    B' : 44.5 ± 3.5 kg/cm²
    (4.36 ± 0.34 MPa, 632 ± 49 psi)

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 17, 2008



    Remove the front brake tube (B) and rear brake tube (C) from the master cylinder (A).


    Connect two pressure gauges (D); one to the output valve of the front (B) and rear (C) brake.

    Be sure to bleed the system after connecting the pressure gauges.


    With the brake applied, measure the front pressure and the rear pressure. If the measured pressures are within the specified range as illustrated, the proportioning valve is good.


    Reconnect the brake lines in their original positions and bleed the brake system.



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