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Thread: Brake Master cyl change type

  1. 23rd September 2009, 10:52 AM #1
    Chilly
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    Brake Master cyl change type

    Hi,

    I have a series 3 with a servo assist master cyl. It is the girling type. One brake pipe attached. Reservoir attached.

    My questions are:

    Will a dual line master cyl fit to the servo assist?

    What has to be changed or added to use a dual line master cyl?

    Any other advise on this change?

    I have replaced all the wheel cylinders as part of the rebuild and I am looking at changing flexible hoses and brake pipes as part of this rebuild.

    Thanks in advance.

    Chilly
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  2. 23rd September 2009, 07:13 PM #2
    lro11's Avatar
    lro11
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    You will need a shuttle valve to split the line from front and rear.
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  3. 24th September 2009, 01:58 PM #3
    foz.in.oz's Avatar
    foz.in.oz
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    You don't actually need one of these. They are a switch that gives you a warning if one of the circuits fail. What you do need is piping to each pair of wheels from each one of the outlets on the master cylinder.
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  4. 24th September 2009, 03:39 PM #4
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    Lotz-A-Landies
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    Quote Originally Posted by foz.in.oz View Post
    You don't actually need one of the( brake balance valves). They are a switch that gives you a warning if one of the circuits fail. What you do need is piping to each pair of wheels from each one of the outlets on the master cylinder.
    The pairs of wheels are "front pair" and "rear pair", and the place where you would split the system is the same place as the balance valve would fit (below the master cylinder on the chassis rail) and the valve body gives you all the hydraulic connections you need to split the system, so you may as well fit the valve and the warning lamp. You will still need a second pipe from master cylinder to the balance valve though.

    Diana

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  5. 25th September 2009, 06:10 AM #5
    foz.in.oz's Avatar
    foz.in.oz
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    Quote Originally Posted by Lotz-A-Landies View Post
    The pairs of wheels are "front pair" and "rear pair", and the place where you would split the system is the same place as the balance valve would fit (below the master cylinder on the chassis rail) and the valve body gives you all the hydraulic connections you need to split the system, so you may as well fit the valve and the warning lamp. You will still need a second pipe from master cylinder to the balance valve though.

    Diana
    Diana,

    Please don't misquote me in your posts. The valve in the picture is a brake failure switch not a "Brake Balance Valve". It does nothing to control pressures or flows between the two systems and only tells you if a circuit a lost fluid pressure, ie a split hose. The same circuit can be achieved by using 2 tee pieces. If you want to use a pressure splitting valve then that's different.
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