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Old 10-01-2018, 02:12 PM
jax11 jax11 is offline
Join Date: Apr 2008
Posts: 11
Just loosing it.

1979 sx11 special,

Have been trying to find GOOD picture - not some 70's drawing - ( I have 2 manuals ) of the way the 2 rubber piston sleeves are put on the REAR M/Cyl plunger . I find the end one next to the spring is cupped towards the spring > which way is the "center" one facing????? same way?????????????????????????

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Old 10-01-2018, 03:29 PM
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Fearthepack Fearthepack is offline
XStremely XSive
Join Date: May 2012
Location: Orlando, Fla.
Posts: 255
search member TucmanXJ then scroll down to 1-12-08 post called Master cylinder rebuild he has a pic to orient what your asking. its a front master but should be the same. also if you soak the rubber seal in brake fluid about 10 mins it will be like a rubber band on install.
1979 F worst one i could find
to convert into a bobber/ streetfighter!

We can't all get along!
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Old 10-01-2018, 03:42 PM
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bikerphil bikerphil is offline
Master of XSology
Join Date: Jan 2008
Location: Broward County, S. Flori-DUH
Posts: 7,465
Pictures in this thread show the plunger seals...


79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (158K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (115K miles)

"If it ain't broke, modify it"

25+ year XS11 owner

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Old 10-01-2018, 03:43 PM
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DiverRay DiverRay is offline
Join Date: Nov 2004
Location: Aptos, CA (Santa Cruz County) 831-234-8721 C
Posts: 6,639
The center rear has the smallest diameter part of the seal facing the front of the piston. That is the front of the piston goes into the bore first. I have a scanned pdf of the brake system that allows you to enlarge. I did a high res scan, so you can see everything easily. If you want a copy, send me an email; ray(at)rjmatteis(dot)com with xs11 brake in the subject line.
Ray Matteis
R1200RT Totaled 11-15-2016
XS1100 E '78 (winter project)
'99 Altima, rain vehicle with ft8900.
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