1961 Delco Moraine master cylinder

[Matt 12861]

Does anyone know the dimensions of the piston gage J8531?  How tough is this to rebuild?   I thought it was a self contained unit I took it off (then I got the manual out).
thanks,
Matt Givler

[fishnjim]

You can buy a rebuilt for $50-60, so why bother?   Cost about that for a rebuild kit.
All depends how nasty the cylinder is.   If needs resleeved or not - just honed.

[62 driver]

Are you going to upgrade to a 2 reservoir system? It would be safer and now is the time.   

[Matt 12861]

I've been thinking about going to a dual cylinder.  How tough is the upgrade?  is there a bolt in part available?  Looking at master cylinders online, some of the ones that say they fit don't look like the Moraine or Bendix ones in the manual. 

[Matt 12861]

OK, I got my rebuild kit in the mail.  Cleaned up the master cylinder, looks ok to use again.  All I need is the dimensions of the J8531 piston gage tool.  Does any one have one they could measure and post the dimensions?  It would help a lot!
thanks
Matt Givler

[69Deville]

Here's a link to the tool on eBay for cheap in case no one has the dimensions.

https://www.ebay.com/itm/KENT-MOORE-J-8531POWER-BRAKE-PUSH-ROD-HEIGHT-GAUGE-TOOL-USED-FROM-GM-DEALERSHIP/401922792446?hash=item5d94771bfe:g:ZZkAAOSwdfJdpf75:sc:USPSPriorityMailSmallFlatRateBox!95023!US!-1

[Matt 12861]

Got it, thanks!