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Search results

  1. S

    1981 GS850G rear brake master cylinder (I need help)

    Thank you salty_monk for the tip on using air pressure to get the pistons out of the rear calipers. Took the calipers apart (yesterday) cleaned out all the gunk and sanded the pads, which were not too bad but I think I'll still order some new ones. To be safe, I used my little compressor (to get...
  2. S

    1981 GS850G rear brake master cylinder (I need help)

    Thank you 2BRacing. Hopefully, I'll get to the calipers and pads today as long as my wife doesn't have too long of a list for me, of things to do.
  3. S

    1981 GS850G rear brake master cylinder (I need help)

    Thank you 2BRacing. That is how I ended up assembling it, I guess I got lucky. Yes, when I originally took the master cylinder apart, there was not a cup in there, just the piston and spring. I thought I remembered which direction the spring came out but, I forgot. (I'm blaming that on my age)...
  4. S

    1981 GS850G rear brake master cylinder (I need help)

    Thanks. I think I'll take your advise and get some new pads. It can't hurt.
  5. S

    1981 GS850G rear brake master cylinder (I need help)

    Installed the master cylinder, bled the brakes, took it for a ride. It seemed OK (yes, just OK) but I think I'll take the calipers apart and check the pads. Any idea how often the pads should be changed? Although I don't have many miles on the bike, 14,300 (I'm ashamed) I'm guessing the pads...
  6. S

    1981 GS850G rear brake master cylinder (I need help)

    Oh, by the way, years ago when I was working on my bike you (bwringer) helped me a lot. Thanks, I appreciate your time and expertise.
  7. S

    1981 GS850G rear brake master cylinder (I need help)

    So, does the tapered part of the spring go in first or does the larger diameter end go in first? I put the wider end in first, then the smaller diameter end seemed to fit into "cup" with the bottom of the cup coming in contact with the piston. It seems to move ok but I'll have to see what...
  8. S

    1981 GS850G rear brake master cylinder (I need help)

    Please read my previous three posts. Where does the "cup" (rubber seal) fit in with my rebuild? I have looked at diagrams but they are not clear. In the diagrams, it looks like it might fit on top of the piston and the base of the spring fits inside of it. When I took my master cylinder apart...
  9. S

    1981 GS850G rear brake master cylinder (I need help)

    Original piston and spring on the left, new rebuild parts on the right.
  10. S

    1981 GS850G rear brake master cylinder (I need help)

    The photo in the previous post is the original piston and spring. This photo is the new kit. The rubber seal in question is the one to the right. Any idea if it is an extra part for another rebuild or what do I do with it? There is no center hole in it.
  11. S

    1981 GS850G rear brake master cylinder (I need help)

    The piston and spring arrived this evening. I purchased the KL kit from Z1 and I saw it is also for several other bikes. There seems to be an extra rubber seal with the kit. Since my bike is a GS850G, am I to assume it is for another bike? If not, where does it fit within the assembly?
  12. S

    1981 GS850G rear brake master cylinder (I need help)

    Thanks. Great info. I'll have to attack it tomorrow. The weather here was nice today so the yard work took priority.
  13. S

    1981 GS850G rear brake master cylinder (I need help)

    I pushed the piston out this morning and the inside of the master cylinder looks pretty clean (I think I got lucky). While I'm waiting for the new parts to arrive, I figure I better flush out my front brakes and maybe try to clean my rear calipers. Any trick to getting the pistons out of the...
  14. S

    1981 GS850G rear brake master cylinder (I need help)

    Yes, I did order a new piston. Hopefully tomorrow I'll see if the penetrating oil freed up the pieces inside, piston and all.
  15. S

    1981 GS850G rear brake master cylinder (I need help)

    I can't remember the last time I flushed the brake lines. I started by pumping the brake pedal, as if I was going to bleed my lines and nothing came out from the calipers, so I worked backwards to the master cylinder. I opened the connection where the brake line meets the master cylinder and...
  16. S

    1981 GS850G rear brake master cylinder (I need help)

    It's been a while since I was a member of this forum but I'm back because, as in the past, I needed help and I always received great advice and assistance from members here. I'm pretty sure I need to rebuild (or buy new) my rear brake master cylinder. I have a 1981 GS850G. Can anyone tell me a...
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