Dotetcher Posted June 26, 2018 Share Posted June 26, 2018 So after replacing the header I took the black bird out for a ride and about halfway into the ride noticed that something didn’t feel right from the rear end. Not mine. The bikes. So while I was moving I pulled the clutch in and just coasted to a stop and noticed that the rear caliper wasn’t releasing the disk. At first I thought the caliper was binding but after getting home and releasing the pressure from the banjo connections at the brake pedal it seemed as though the caliper freed up quite a bit. So is there a valve or a small passageway for the brake fluid that could be obstructed in someway shape or form. Quote Link to comment Share on other sites More sharing options...
XXBirdSlapper Posted June 27, 2018 Share Posted June 27, 2018 I have read about other bikes with this exact symptom. I believe there was a pressure relieve passage in the master, very small, that could be obstructed and lead to pressure build up in the rear caliper. Have you regularly replaced your brake fluid? Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted June 27, 2018 Share Posted June 27, 2018 There is no valve in the master. There is the port that lets fluid in/out of the cylinder. Did you recently adjust the pedal height or remove the master, or make any changes in that area? The piston isn't returning far enough back to uncover that port, usually happens when someone makes a pedal height adjustment, or maybe the pedal or piston is sticking. Quote Link to comment Share on other sites More sharing options...
poida Posted June 27, 2018 Share Posted June 27, 2018 it could be the slider pin is gummed up.years ago the one on mine was full of crud.it has a 14mm bolt head. i recently replaced front and rear brake pads and the rears were sticking with the new pads.slider bolt was clean so gave the pistons a clean by pushing them almost all the way out and cleaning them with a rag dipped in brake fluid.made no difference so ended up refitting a half worn set and that was enough to bypass the problem.am interested in hearing others responses to your question as im stumped where to look next to fix them. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted June 27, 2018 Author Share Posted June 27, 2018 I've made no adjustments. Also haven't changed fluid in a while. I'll check the slider pin first. Thank you sirs. Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted June 27, 2018 Share Posted June 27, 2018 The check valve slapper references would be in the secondary master cylinder, and that can become clogged. Differential diagnosis would include finding what piston(s) of the rear caliper are hanging up. Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted June 27, 2018 Share Posted June 27, 2018 14 hours ago, Dotetcher said: So after replacing the header I would be looking at any other part that was touched during the header swap. I think the right muffler attaches to the right peg bracket, maybe something there got moved/tweaked. Maybe a hose got pinched. At least 90% of the time that a new problem arrises right after fixing something it was an effect of the repair process. And I forgot about the LBS. Grab a wrench that fits the banjos on the caliper. Ride 'till it starts to tighten up. See which has pressure, now you'll know which circuit has the problem. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted June 30, 2018 Author Share Posted June 30, 2018 Found this link that explains how the linked brakes work. http://ixxra.org/birdbrakes.htm Sitting on the bike in the driveway while i have the rear caliper released I grab a handful of front brake and release. According to the link the two outer pistons of both are activated while engaging the front brake. When I release the front brake the bike rolls freely. Did this a number of times with the same result. Engaged the rear brake pedal, then released and the caliper is locked. So I'm thinking its either the center piston binding or problem somewhere in the rear circuit. Back to work. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted June 30, 2018 Author Share Posted June 30, 2018 Released pressure on rear most banjo. Caliper still engaged. Release pressure on front banjo. Bike rolls freely. Back to it after it cools off outside. Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted June 30, 2018 Share Posted June 30, 2018 The front brake will only apply rear brake when in motion so grabbing front brake sitting still would do nothing to the rear. There's a master cylinder attached to the left front brake, braking force pushes on that master to apply rear brake. Regardless, there appears to be a problem with the rear brake pedal/master cylinder. Do the test again, when it's locked up pull up on the rear brake pedal and see if it releases. How long did the bike sit before getting the new header on and going for a ride? 1 Quote Link to comment Share on other sites More sharing options...
Redbird Posted June 30, 2018 Share Posted June 30, 2018 Which banjo on the front released the pressure, and are the front brakes binding at all? Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted June 30, 2018 Author Share Posted June 30, 2018 loosening the forward banjo on the rear caliper releases the rear brake. Front brakes are fine. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted June 30, 2018 Author Share Posted June 30, 2018 3 hours ago, superhawk996 said: How long did the bike sit before getting the new header on and going for a ride? About 3 weeks. Quote Link to comment Share on other sites More sharing options...
Redbird Posted July 1, 2018 Share Posted July 1, 2018 21 hours ago, Dotetcher said: loosening the forward banjo on the rear caliper releases the rear brake. Front brakes are fine. Sorry, I misunderstood your earlier post about releasing the front brake. If the rear is sticking and the front isn’t, my money is on a problem either in the rear caliper or between it and the rear master. If it was the rear master itself, the fronts would drag as well. Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted July 1, 2018 Share Posted July 1, 2018 Sitting here in my underwear is when I do my best thinking. Trouble is, that thinking isn't backed up by fact because I can't just run outside and look. Soooo........ Front banjo of rear caliper should run to the proportioning valve, and if you trace the line on the other side of the proportioning valve, it should end at the......secondary master cylinder, located on the left fork leg. The secondary master cylinder can get gunked up and not release pressure. And PCV's have been known to go bad as well. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted July 1, 2018 Author Share Posted July 1, 2018 Tnx guys. Will check it out as soon as it cools down outside. Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted July 12, 2018 Author Share Posted July 12, 2018 Haven't forgotten about posting findings. Time and resources have been focused on new toy. I'll get to the xx soon. Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted July 12, 2018 Share Posted July 12, 2018 This place is on the verge of becoming a Jeep forum. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted July 13, 2018 Share Posted July 13, 2018 8 hours ago, superhawk996 said: This place is on the verge of becoming a Jeep forum. No shit. Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted July 13, 2018 Share Posted July 13, 2018 Not for all of us. Quote Link to comment Share on other sites More sharing options...
Redbird Posted July 13, 2018 Share Posted July 13, 2018 8 hours ago, blackhawkxx said: Not for all of us. Yeah, for the rest of us it's a gun forum. Bill, when you going to sack up and buy that .40 from me? 2 Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted July 14, 2018 Author Share Posted July 14, 2018 So back into the rear caliper issue. Bike hasnt moved since the last time I posted about the problem. Went to move it to a better position in the driveway and the bike rolled fine. Hit the rear brake a couple of times and the problem returned. Loosened the banjo at the proportioning control valve and the caliper released. Retightened. Hit the rear brake a number of times. No problem. Took the bike for a spin. No problem. Loosened and retightened both connections to the PCV while applying a little pressure to the rear brake. Just enough to dribble a smidge of brake fluid. Retightened. So far things seem to be ok. Gonna take it for a spin this evening (carrying the appropriate tools) and see what happens. Maybe some smegma in the valve that cleared itself? Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted July 15, 2018 Share Posted July 15, 2018 Anything's possible. Sometimes stuff just hangs up for no apparent reason then 'fixes' itself. If it's been a while it would be a good idea to do a fluid flush. 1 Quote Link to comment Share on other sites More sharing options...
Dotetcher Posted July 15, 2018 Author Share Posted July 15, 2018 9 hours ago, superhawk996 said: Anything's possible. Sometimes stuff just hangs up for no apparent reason then 'fixes' itself. If it's been a while it would be a good idea to do a fluid flush. Will do. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted July 24, 2018 Share Posted July 24, 2018 On 7/1/2018 at 8:31 AM, rockmeupto125 said: Trouble is, that thinking isn't backed up by fact because I can't just run outside and look. Why not? It can't still be cold out there. Quote Link to comment Share on other sites More sharing options...
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