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TOPIC: Front Master Cylinder Rebuild on Rear?

Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24381

  • Lucien-Harpress
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Because front master cylinder rebuild kits for these bikes are everywhere, but a rebuild kit for the rear is non-existant (not counting an $80 kit in the UK), has anyone checked to see if the rubber portions (the cups) of a front master cylinder rebuild will fit the plunger of the rear master? They seem close (even though transferring them over might be a pain without messing them up), but I'm wondering if anyone has actually done it before.

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Last edit: by Lucien-Harpress.

Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24385

  • razmo99
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Both the Bores are 5/8, and the seals are basically the same. I have used the seals from a front MC on the Rear and it works/Seals. Only concern is the condition of the piston and bore, and you need to be super careful when you take the seals off then reinstall them.
84 ZG1300
81 KZ1300-A3
83 GT550
90 GPZ900R
83 KZ550
81 KZ550(in parts)
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Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24386

  • stonehill
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Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24397

  • StanG
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Same bore, same rubber. I've heard from people who have done it with success. But spending the money and investing in the bike, expecting to keep it let's say for 10 years to come, doing the master cylinder is pretty much a one time deal. I'd spend the extra 20 and have everything there new. That's my approach when I comes to mechanical components when replacements are available and I can afford them.

The dust boot for rear is different and was not available, but I think it is now from zed parts.
1982 Kawasaki KZ1300 A4
1981 Kawasaki KZ1300 A3
assembling engine, chassis & electrical from 79 - 89 parts
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Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24404

  • strate6
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Very useful information to have !

Pete F
UK
The Older I Get........The Better I Was !

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Front Master Cylinder Rebuild on Rear? 2 months 1 week ago #24417

  • stonehill
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B2 rear cylinder is 14mm and -79 is 5/8 "(16mm)

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