Brake Oring thickness

[crxcte]

On the MS28755-224 brake Oring, I found the spec on the thickness to be between 0.135 inches and 0.143 inches.  Every Oring I have ordered has been on low side of the spec.  Has anyone measured the thickness with a micrometer and found a supplier on the higher end of the spec?

[47U]

13 hours ago, crxcte said:

I found the spec on the thickness to be between 0.135 inches and 0.143 inches.

What’s your reference?  The -224 diameter is 1/8” or 0.125”.  Is that not correct?  

Are you having trouble with the calipers not sealing after replacing the o-rings?

[MB65E]

On my calipers.
I used PN: MS28775-326 

Older M20E. There were several orings used. This one sealed the best. Someone on here provided me the reference years ago. 
-Matt

[47U]

19 hours ago, crxcte said:

Every Oring I have ordered has been on low side of the spec.

 

4 hours ago, MB65E said:

I used PN: MS28775-326 

Older M20E. There were several orings used.

My (feeble) research shows that for the 1967 model year Mooney changed the caliper size.  

Pre ‘67 the o-ring was 1 5/8” x 2” x 3/16” pn MS28775-326.

The ‘67 model year changed to 1 3/4” x 2” x 1/8” pn MS28775-224.

I did see a reference to the diameter size you state for the -224 of 0.135 - 0.143 inches.  Which I can’t say I’ve measured the o-ring diameter last time I did my calipers, maybe 15 years ago (which I’m using the -326 pn on my C).  If there’s corrosion in the o-ring groove on the piston or the sealing surface on the caliper, a scotchbrite pad might clean it up enough that it will seal.  If there’s been too much metal removed, then I don’t think an 1/8” diameter o-ring 0.010” undersized from the 0.135” minimum spec is going to fix your problem.  (Purely speculative on my part.)  

Good luck.