Rear brake woes
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RE: Rear brake woes - 5/12/2008 12:48:28 AM
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Ribcracker
Posts: 298
Joined: 2/13/2008
Status: offline
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well we seem to have a rash of these :)
read some of My other posts on trouble shooting brake issues. But if every things is new check you free play in the linkage :)
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S.T.D.E
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RE: Rear brake woes - 5/13/2008 2:09:47 AM
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Ribcracker
Posts: 298
Joined: 2/13/2008
Status: offline
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there should never be any build up of pressure once the brake pedal is released. On a drum system the shoes are either manualy adjusted for clearance or there is some form of auto adjustment.
Right lets trouble shoot this.
One thing I noticed you didnt mention was making sure there was free play in push rod from the pedal to the master cylinder. Make sure the pedal isnt sticking and is returning fully. If it does is there any slack/free play there. Next undo the lock nut on the master cylinder end of the rod and then wind the collar where the rod screws in further onto the shaft then see if it releases if not wind it the other way till the rod is out and try again. You can use a screwdriver pushed into the end of ther to operate the master cylinder. Seeing as you dont need much leverage to just move the pads. If this doenst make any difference its down to the fluid side.
We need to make sure this is a case of the presure build up after you release the brake or is it that its down to the pads binding in the caliper.
Take the caliper off and slide a piece of wood between the pads.Press the pedal to push the pads out a little. and see if you can push them back. If you cant push them back, crack the bleed nipple. If they go back its pressure build up if not its the pads or the pistons binidng.
If its the pads take them out and try it again with just the psitons. Check the pads for signs of rubbing agsint caliper and also check the caliper for marks or burs.
If its pressure we now need to work back from the claiper to find out where the fault is.
Wood back in press the brake, this time crack the banjo bolt on the caliper. If the pads still dont return pull the bolt and make sure there isnt any dirt or maybe a bit of swarf left thats stoing the fluid returning. If the pads go back, tighten the bolt and work down the line to the next union, which is probably the brake light switch, do the same for each union till you get back to the master cylinder. If the pressure releases when you losen the bolt on the master cylinder, then it is a probelm with the master cylinder. Again check for dirt or swarf.
I know this is a lot to do but it will isolate where your problem is ratehr than just throwing bits at it blindly. I hate bleeding brakes as no matter how carefull you are the damned fluid always gets soemwhere you didnt want it :)
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S.T.D.E
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Printable Version
...is it the flexible line?I've never encountered this problem before!!!
All jokin aside,NOTHIN has changed after changing washers,making sure all the fittings were tight,Every component associated with the back brake/rotor assy. is new.....There's just one thing that makes me think twice about this....The master cylinder is for older style harleys with drum brakes. 
