Replacement Master Cylinder Site Glass By scooterdad154 (Read 1,747 times)

[scooterdad154]

Hi

Just wanted to share something that has worked for me as a Master Cylinder (MC) Site Glass replacement. Actually, on my scoot the original site material appears to have been plastic.

I performed this replacement on my front brake MC last Fall and it is still holding up. (I accidentally put my finger thru the site window while I was wiping what I thought was dirt off the site window.)

The rear MC site window looked cloudy like it was cracking so I started the same replacement today. I used a 17.5 mm diameter, 1.5 mm thick watch crystal to replace the site window. I purchased the watch crystal from a local jeweler.

• Remove brake lever bolt and brake lever
  
• Remove brake switch wires from brake light switch
  
• Remove brake light switch screw and switch
  
• Remove mirror
  
• Open lid on MC
  
• Sop up brake fluid in MC reservoir with paper towel
  
• Remove brake line bolt from MC (keep rag underneath to catch any brake fluid drips)
  
• Remove the two bolts that keep the MC attached to handle bars
  
• Remove the MC and sop up remaining fluid
  
• Chip out the broken plastic window
  
• Use a small screw driver to pry out the metal ring and then rubber gasket from the MC (get the screwdriver blade behind the rubber gasket and pry up. It took me several attempts.)
  
• Use brake cleaner spray to clean up MC reservoir and site opening (I used straight edge razor blade and utility razor to scrape off foreign matter from within reservoir and site window opening
  
• Applied Permatex PermaPoxy 5 minute general purpose epoxy to the inside edge of the site window and edge of the watch crystal
  
• Let dry overnight
  
• Reassemble components and bleed brake line.
  

scooterdad154

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[justbuggin2]

cool idea i did mine def though i pulled the metal ring out cleaned it well put flux paste on it and laid it on a steel plate then took propane touch with silver solder filled the ring with the solder let cool and put it back in with no leaks

[bhinch]

Excellent guys...thanks....for the info...That is thinking outside of the box.....Life is Good...