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48 Lin rebuilding wheel cylinder


Cokekid
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I am in the process of rebuilding the left wheel cylinder. When I removed then cylinder to dissembled it, the parts on the right came out.  The new part came in the box, but I noticed there was a round metal piece on the left that was not there.

 

 

 

 

1956897876_LINWHEELCYLINDERSPRING103825.JPG.e41186090895ad16976760a1eb7ae591.JPG

 

The parts list doesn't show the round metal piece.

66596885_LINWHEELCYLINDERPARTSLIST03826.JPG.efe138be1cbfce9b082c7dfc87ece939.JPG

 

 

 

515608546_LINCYLINDERBOX03827.JPG.b4d0fd055f5aa2264e79cab118b94514.JPG

 

Which part is correct.?

 

Gerry

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I phoned Chris at Boos-Herrel and asked about why the cylinder I removed had this round metal disk in it and the rebuilding kit never had one . He was not aware of why there was a metal disk in the cylinder.

 

I am going to install the kit I bought and assume the end of the spring is wider as  it just replaces the disk.

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Gerry, I have never seen the metal disk in any old or new brake cylinders I have worked on. I have seen the larger diameter springs on some newer model cars, but not sure why the design is different or what the advantage is verses the old style springs. A local brake or repair shop, or the supplier that sold you the brake kit might have insight.  Regarding the rest the assembly, being overly cautious-since the photo doesn't show all the new parts in the rebuild kit, your new kit does include new 2202 rubber seals in front of new 2198 metal pistons, correct? Paul

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Those discs are called expanders.. When a wheel cylinder is honed during rebuild, the expander fits inside the cup to aid in sealing against the bore of the wheel cylinder.

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I replaced the front wheel cylinders on my 47 Lincoln 76H convertible and found them to be cylinders for a 1947-1949 heavy duty truck, which I had to stick with because the connectors, 3/8 24 thread, would not work with the standard Lincoln replacement part. For $16.95 each, better to replace than rebuild.

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