M/C or proportioning valve
Thread Starter
Racer
Joined: Nov 2006
Posts: 495
Likes: 1
From: Lubbock TX
M/C or proportioning valve
I just swapped out my rear suspension with a vbanp one. So the two back calipers came off and also the drivers side front(leaking-replaced it) They are all fairly new and I didnt have any problems before my rebuild.
Now I cannot get a hard pedal. I know there are tons of treads about this but I am asking how to tell if its a bad MC or my proportioning valve is stuck.
When I bleed the fronts, everything is fine...no bubbles (using the two person method of opening and closing bleeder). But the rears dont have very much pressure and seem to still have air in them. I drove around and theres enough brake to barely stop. The front rotors were pretty warm but the back were cool. (so no back brakes?)
I didnt let the M/C go dry(clamped the rear rubber lines-maybe this caused a problem??) but could this be the problem? Or since there is low pressure when bleeding the rears is the proportioning valve stuck? I tried a couple methods to reset it but nothing has worked. BTW the brake light is on.
Im not sure where to start, I have bled them several times but nothing is working. Any one have any ideas before I go buy a new M/C.
Thanks,
Sean
Now I cannot get a hard pedal. I know there are tons of treads about this but I am asking how to tell if its a bad MC or my proportioning valve is stuck.
When I bleed the fronts, everything is fine...no bubbles (using the two person method of opening and closing bleeder). But the rears dont have very much pressure and seem to still have air in them. I drove around and theres enough brake to barely stop. The front rotors were pretty warm but the back were cool. (so no back brakes?)
I didnt let the M/C go dry(clamped the rear rubber lines-maybe this caused a problem??) but could this be the problem? Or since there is low pressure when bleeding the rears is the proportioning valve stuck? I tried a couple methods to reset it but nothing has worked. BTW the brake light is on.
Im not sure where to start, I have bled them several times but nothing is working. Any one have any ideas before I go buy a new M/C.
Thanks,
Sean
Last edited by smon; May 14, 2009 at 07:52 PM.
Intermediate
Joined: Feb 2009
Posts: 44
Likes: 1
From: Spangle (near Spokane) Washington
St. Jude Donor '09
Switch is probably stuck.
I had a similar problem. Try hard brake pressure. I did and actually heard the switch (prop. valve) pop. Has worked fine since.
