Highnote1 Posted October 10, 2022 Share Posted October 10, 2022 Replaced everything in rear brakes a few months ago. 74tii. Brembos drums and shoes from blunt. Pedal is good. Rear Passenger side still drags no matter what I do. I have adjusters freed up and not contacting shoes at all. Drivers side is fine but passenger is still dragging after a drive. E cables seem fine..the only thing I’m wondering is if spring is not returning arm all the way open again after using. Cables engage and let go enough to spin wheel by hand but still get warmth! Can those springs get weak but cable still operate ok? Any ideas? I had drums off many times now at this point trying to solve. Quote Link to comment Share on other sites More sharing options...
tech71 Posted October 10, 2022 Share Posted October 10, 2022 What about the brake cylinders. Did you replace them? They can corrode/ bind/seize up. Result is a stuck or binding brake on one side Quote Link to comment Share on other sites More sharing options...
Mike Self Posted October 10, 2022 Share Posted October 10, 2022 Have you checked to see if the emergency brake cable on that side is not moving freely? Pull the pax drum, and have lovely assistant pull up on the e-brake handle while you observe the cable moving. They can get stuck in their housings--usually the cable's plastic cover starts to disintegrate and jams up in the guide tube--and not allow the brake to release. Another thought...I just replaced both drums and shoes on my '73, and discovered that even with the adjusters backed all the way off, the drums dragged. I ended up hand filing the high spots on the shoes--several times--before they would clear the drums. When you pull the drums, look at the shoes' friction surfaces for high spots, and file accordingly. And...the problem may be a failing rear wheel bearing. While you have the wheel off the ground and before you remove the drum, rotate the drum and listen/feel for any noise or roughness...that might be a bearing moving into failure mode... mike 1 Quote Link to comment Share on other sites More sharing options...
Highnote1 Posted October 10, 2022 Author Share Posted October 10, 2022 16 minutes ago, tech71 said: What about the brake cylinders. Did you replace them? They can corrode/ bind/seize up. Result is a stuck or binding brake on one side New cylinders too! Quote Link to comment Share on other sites More sharing options...
John76 Posted October 10, 2022 Share Posted October 10, 2022 Pull the passenger shoes and check the rivet that holds the e-brake lever. I had a new set of shoes and could not get the passenger side to stop dragging (all new e-cables, brake lines & cylinders) and finally discovered the e-brake lever was sticking and not releasing. Had to pry the rivet a bit and add a drop of lube to get it right. Also check the upper spring to make sure the hooks are facing out. Let us know what you find. John 3 Quote Link to comment Share on other sites More sharing options...
Highnote1 Posted October 10, 2022 Author Share Posted October 10, 2022 5 minutes ago, John76 said: Pull the passenger shoes and check the rivet that holds the e-brake lever. I had a new set of shoes and could not get the passenger side to stop dragging (all new e-cables, brake lines & cylinders) and finally discovered the e-brake lever was sticking and not releasing. Had to pry the rivet a bit and add a drop of lube to get it right. Also check the upper spring to make sure the hooks are facing out. Let us know what you find. John Rivet area is good…did a search and knew to check that as well. My springs are not facing out…seemed like such a b to get that to happen. I don’t see the hook contacting anything else but can go back and do that over again…sandwiching all of that together with spring on the inside seemed pretty hard! Quote Link to comment Share on other sites More sharing options...
John76 Posted October 10, 2022 Share Posted October 10, 2022 4 minutes ago, Highnote1 said: sandwiching all of that together with spring on the inside seemed pretty hard! Install the spring properly on both shoes before you slip the ends into the brake cylinder pucks. Then use clamps to hold the bottoms while you wrestle with the lower "B"-spring. 1 Quote Link to comment Share on other sites More sharing options...
halboyles Posted October 10, 2022 Share Posted October 10, 2022 37 minutes ago, John76 said: while you wrestle with the lower "B"-spring. If you use clamps like @John76 recommends, it is very easy to jack the spring up into the retainer with a floor jack. 2 Quote Link to comment Share on other sites More sharing options...
jp5Touring Posted October 10, 2022 Share Posted October 10, 2022 43 minutes ago, halboyles said: If you use clamps like @John76 recommends, it is very easy to jack the spring up into the retainer with a floor jack. This is the way to go though its a bit sketchy. Works easy with two people. We had to do this like three different times after we got everything correct. Takes like two minutes to get it attached. Not quite as fun as using a spring compressor. 🙂 Quote Link to comment Share on other sites More sharing options...
Rodolfo Lasparri Posted October 10, 2022 Share Posted October 10, 2022 Mine just did the exact same thing, but I had some bad drag after the first run on the pass side. It turned out my new wheel cylinder wasn't working properly. One side was stuck for some reason and after some finagling, I was able to free it up; all good then. I am running the 320i larger drums on my 73 Tii - so not exactly the same as you. Quote Link to comment Share on other sites More sharing options...
rstclark Posted October 11, 2022 Share Posted October 11, 2022 Check the Ebrake cables for free movement The tubes get rusty and snag I'll bet that's the problem Quote Link to comment Share on other sites More sharing options...
Dudeland Posted October 13, 2022 Share Posted October 13, 2022 Residual Pressure? When is the last time you replaced the flex lines? Could be swollen or blocked. Quote Link to comment Share on other sites More sharing options...
Highnote1 Posted October 14, 2022 Author Share Posted October 14, 2022 1 hour ago, Dudeland said: Residual Pressure? When is the last time you replaced the flex lines? Could be swollen or blocked. I have good fluid to the drums on bleeding but have new lines if nothing else fixes it. Will dig back in on Sunday again. Quote Link to comment Share on other sites More sharing options...
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