Search the Community
Showing results for tags 'proportioning'.
Found 5 results
-
Just some little info for you all. I could not find any info on how the proportioning valve is put together and I know someone else (& it was a dealer) worked on the one I have on my parts bike before I got the bike, because the rear brakes would not release after you pump on the rear brake pedal. First I checked the rear caliper by opening the rear bleeder and then the wheel would move just fine . I checked the rear master for a pluged up return little hole but that was clean , I rebuilt the master because I had it out , so then on to the proportioning valve . Well I took it apart and found the following. The person before me put the last seal in under the spring washer which is wrong. It is to go in the end nut and then I also found out that the first seal you install DO NOT INSTALL ON THE PISTON.(which the dealer did ) and I also did the first time. The proportioning valve will not work ,the seal goes to the wrong place and will not release the pressure back to the master. You have to install the first seal by pushing it down the tube all the way to the bottom then push the piston into the seal then install the spring,spring washer and last the nut with the seal placed inside if the nut. Then I put back on my bike Everything works fine. Just to prove that even if you take it apart and put it back the way you took it apart, may be the wrong way and that is what I found out. It would have been nice to have a breakdown of it to save some time. The Yamaha service manual does not have anything on the proportioning valve except a picture for my 1986 Venture Royal. I hope this info might help others that have the same problem. Most of the time this problem is a plugged small return hole in the master but not this time. -
Someone was looking for a valve last night. Here is entire thing. http://cgi.ebay.com/ebaymotors/1983-Yamaha-XVZ-1200-Venture-rear-brake-master-cylinder-/370425478537?pt=Motorcycles_Parts_Accessories&hash=item563f143d89
-
Hey all, I'm in need of a rear proportioning valve for the rear master cylinder. If anyone could help me out I would appreciate it, I'd like to avoid spending $75 for one....Thanks -
The other thing I got done today was adding the proportioning valve to my rear brakes. This is a modification that Rick Butler came up with to make the rear braking on these bikes a bit less sensitive. This is another easy modification if you get the parts from Rick as I did. I did take pictures of the installation and will try to get a tech article posted tomorrow. Basically what this is though is a mini proportioning valve. You simply remove the rear brake line and screw this proportioning valve right into the rear brake master cylinder. You then install the new stainless steel line between the proportioning valve and your rear brake caliper. Bleed the brake and you are done with the install. The proportioning valve is adjustable. Rick sent it calibrated the same as the one on his bike and for initial testing purposes, I left it there. These things are hand adjustable and very easy to change. The first thing I did when I got a little ways down the road was to see if I would lock up the rear brake. Yep, I still can. It took more pressure than before the modification though and that is what I was looking for. To be honest, I think it actually still locked up easier than I want it to but like I said in another post, it has rained here off and on all day so it was really not a good time to be testing it. I am pretty much convinced though that this is going to end up being one of the top modifications available for our bikes when it comes to safety. Hopefully things will dry out around here a bit before the weekend is over and I can do some better testing. I may adjust it down a bit more so that it is even less sensitive yet but when I get on truly dry roads, I may find it to be fine just as it is. -
Folks, I’m finished with this project and I am happy to report that installing a proportioning valve in-line to the output side of the master cylinder, has exceeded my expectations. Attached is my analysis of this project. Rick
