Master Cylinders and Boosters.

Discussion in 'Gen 1 & 2 - Suspension, Brake Systems, & Body' started by sperold, Feb 27, 2021.

  1. sperold

    sperold Last to Know Supporting Member

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    Are there differences in the years 90 to 95 for these items.

    Would the master cylinder and booster for a Taurus with 4 wheel disc brakes and ABS be the same as the SHO?

    How about automatic and standard transmission SHOs?

    I was sure they would all be alike for all the years until I started looking into it, and I notice a lot of choice and some puzzling descriptions.

    Looking for a little clarity on this topic.
     
  2. luigisho

    luigisho SHO Member

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    There were some differences. The 93 was a higher failure than others IIRC.
     
  3. sperold

    sperold Last to Know Supporting Member

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    I am noticing that the listings don't specify SHO any longer.

    And most don't have a reservoir included.

    Some have 2 threaded ports and some have 4, and they all claim to be the one for me.
     
  4. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    The 4 outlet port ones are for no abs, the abs ones have only 2 outlet ports and the abs system divides up to the individual wheels. All the abs ones should be the same, whether for SHO or not.
     
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  5. sperold

    sperold Last to Know Supporting Member

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    Wouldn't you know it.... the only listing that specifically mentioned SHOs was the one with 4 threaded ports. So much for factory provided specifications!!

    How does the reservoir attach to the master cylinder, is it something that I should be able to do?

    I am going to have to hope for no problems on the power brake boosters, I looked at master cylinders and there are different bolt spacing on the attachment pad to the booster, and so far, I can only find one booster supplier; but with some luck, that one will work.
     
  6. zoomlater

    zoomlater SHO Member Supporting Member

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  7. sperold

    sperold Last to Know Supporting Member

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    ^^^^^Very good advice.
    I found something unusual in my search, the ShoSource master cylinder has 3 ports, there is a port on the bottom of the master cylinder.
    Other suppliers have master cylinders with 2 ports, they have the boss where the 3rd port is located, but it has not been machined to create the port.

    Is anyone familiar with this 3rd port line, and does it lead to the ABS unit?
     
  8. zoomlater

    zoomlater SHO Member Supporting Member

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    Last edited: Mar 6, 2021
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  9. SHOMON

    SHOMON 95 MTX Supporting Member

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    Master cylinder no reservoir Raybestos part# MC390130 $64.79
    Cardone Reman booster no master #5474303 $49.79
    Cardone Return and Rebuild includes master #504316 $155.99
     
    Last edited: Mar 8, 2021
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  10. sperold

    sperold Last to Know Supporting Member

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    Just to keep the information all in one place:

    I looked under my master cylinder on all 3 of my SHOs with ABS, and none of them have that 3rd port.

    I am going to get a master cylinder from ShoSource that has the 3rd port and see what it looks like in real life. I thought at one point that maybe it had an extra sensor rather than a direct line to the ABS module, but I have nothing like that on my cars with ABS.

    Thank you Zoomlater and Shoman for your recent comments and Rubydist for an earlier response, all have been helpful in my quest.

    I have the 90 Helms manual and it does feature the 4 wheel disc with ABS system, and none of the diagrams concerning the master cylinder show this 3rd port on the bottom of the master cylinder.
    And the vehicle application of this "Brakes - 4 Wheel Antilock" system reads "Taurus / Sable (except 2.5 liter), Taurus SHO".
     
    Last edited: Mar 12, 2021
  11. sperold

    sperold Last to Know Supporting Member

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    I got the ShoSource master cylinder and here are my findings:

    The 3 port master cylinder is a myth. The ShoSource model has the same untapped boss on the bottom of the cylinder that you see from other sources. I was going to check with ShoNut, who makes the stainless line kits, but it does not seem necessary now. If it was plumbed-up, he would know about it.

    Thanks to all that contributed.
     
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