Miltown
XS400 Member
I can't find a rear master cylinder anywhere! Can you guys help? I have the old one and can't find a rebuild kit either! Is there another bike that would have a compatible master??
Thanks!
Thanks!
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1977 XS400 Rear Brake Master Cyliner...Help!!
- Thread starter Miltown
- Start date
Keeping the old cylinders can be tricky.
Looks like the specific cylinder is common to three years of XS400 models: http://www.boats.net/parts/detail/yamaha/Y-1U4-25850-51-00.html
I didn't look too close but the local salvage yard here had some similar looking ones when I was last in.
This is the piston assembly: http://www.boats.net/parts/detail/yamaha/Y-1U4-W0042-50-00.html
Used on a few more bikes than the cylinder itself.
Looks like the specific cylinder is common to three years of XS400 models: http://www.boats.net/parts/detail/yamaha/Y-1U4-25850-51-00.html
I didn't look too close but the local salvage yard here had some similar looking ones when I was last in.
This is the piston assembly: http://www.boats.net/parts/detail/yamaha/Y-1U4-W0042-50-00.html
Used on a few more bikes than the cylinder itself.
TimBuz
XS400 Enthusiast
My rear master was a mess, the difference between rebuilding it and buying a modern one wasn't a massive amount. So I picked up a brembo PS13. Stock rear was 5/8 inch on my bike. This ones a little smaller at 13mm, but shouldnt make a great deal of difference. you just need to weld a new tab as the spacing for the mounting points is smaller at 40mm. Stock was 54mm or so if i remember correctly. Also you need an external reservoir which is only a couple of bucks. I got mine from here https://store.bevelheaven.com/brake...r-brembo-rear-brake-13mm-push-rod-type-black/ It was cheapest option I could find it at the time.
This guy uses it too http://bikeglam.com/custom-1978-yamaha-xs400/
This guy uses it too http://bikeglam.com/custom-1978-yamaha-xs400/
motoman1979
XS400 Member
Having the same issues with my rear brake master cylinder. It needs a rebuild but the kits are impossible to find. TimBuz, how did your Brembo replacement work out? Any tips for doing that conversion? thx
TimBuz
XS400 Enthusiast
It works great! As i said you just need to weld a tab to the frame for the new cylinder and make sure it lines up with your stock brake rod
