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Brake reservoir sight glass replacement? 23 May 2018 13:40 #783888

  • Lordzacharious
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Can it be done?? It seems a lot of the professional places that offer rebuild services replace the glass, but I cant find the part anywhere. Any help guys?
(2) 78 KZ1000A
76 KZ900
2018 900rs Cafe

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Brake reservoir sight glass replacement? 23 May 2018 14:14 #783892

  • Nessism
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If you use google you will find replacement sight glasses. 18mm is the common size. There are youtube videos too.

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Brake reservoir sight glass replacement? 24 May 2018 05:10 #783920

  • ThatGPzGuy
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I used watch glass to replace a reservoir for a Honda Interceptor. It had to be glued in. Worked fine...
Get the measurement and hit up eBay.
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Brake reservoir sight glass replacement? 24 May 2018 06:35 #783927

  • martin_csr
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I investigated a replacement sight glass as a just in case some time well over a year ago.
The following is from my notes for the 81 KZ650-CSR & a KZ750-H Ltd.

The glass disk is encased in a metal ring & there is a gasket around the ring and the sight glass assy is press-fit into place.
The gasket has a deep groove that the metal ring fits completely into, so the metal ring is kind of encased by the gasket/seal.
Using a HarborFreight digital caliper: (the measurements are kind of approx as I was getting different numbers measuring several times).
24.8mm gasket OD. 23.3mm gasket ID. 23.00mm metal ring OD. 19.1mm metal ring ID.
gasket w ring = 25mm OD & 18.5mm ID. metal ring = 23mm OD & 19mm ID. 6.75mm deep.
m/c orifice = 24.8mm ID & 7mm deep (since there isn't an o-ring, this orifice does not have a groove).
For replacement glass: glass button. 2mm / 2.5mm mineral glass

Z1Ent has an oil gauge sight glass that may fit, but I've never heard of anyone using it on a master cylinder. Kaw & Suzuki. 25mm should be correct, but I don't know how deep it is.

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Last edit: by martin_csr.
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