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ACRO E-mail Archive Thread: [Acro] Re:


Thread: [Acro] Re:

Message: [Acro] Re:

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From: Joel S Utz <jutz at>

Date: Tue, 05 Nov 2002 15:45:38 UTC


  Okay, I've checked all of my dictionaries; what does "ullage" mean?

>On my S-1S I have a 8-inch length of 3/8-inch clear tygon tubing
>connected to the top of the reservoir terminating in a small shutoff
>valve (like the brake caliper fill valve) that is tie-wraped above the
>reservoir. This valve is opened to vent the cavity for filling. To fill
>the reservoir I use a brass oil pump gun to connect to the brake caliper
>valve with a short length of clear tubing. After all air is expelled
>from the tubing I connect the pump tube to the brake caliper valve and
>then open the valve to pump oil into the reservoir, frequently checking
>the top tygon tube to observe the oil fill level. To avoid any mistakes
>a jar is placed under the top tube. As soon as oil appears in the top
>tube, filling is complete and the top valve can be closed trapping a
>visible ullage of air to allow for thermal expansion, etc. If the brakes
>have been serviced then both calipers must be filled. The last check is
>application of foot pressure to insure there is no sponginess indicating
>air in the line. Luck, Gil Tellier
>Peter Ashwood-Smith wrote:


                                                   Joel Samuel Utz
                                                   jutz at


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