1987manche4x4 Posted February 22, 2013 Share Posted February 22, 2013 So I bought a new cylinder for the left rear brakes , cause it wa leaking , got them all installed and everything and they still leak. Could it be my master cylinder sending to much pressure and making the seal leak? Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 22, 2013 Author Share Posted February 22, 2013 I have a dana 35 rear end Link to comment Share on other sites More sharing options...
maddzz1 Posted February 22, 2013 Share Posted February 22, 2013 are u sure its not a brake line thats leaking. Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 22, 2013 Author Share Posted February 22, 2013 are u sure its not a brake line thats leaking. Pretty sure cause when I have the drum off I can see it leaking from under the cylinder , but I will check at the back were the cable is connected and see if its leaking. Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 22, 2013 Author Share Posted February 22, 2013 Actually I take that back I almost forgot. The little rubber end on the cylinder piped off when I was bleeding my brakes. That's we're it leaks from. Link to comment Share on other sites More sharing options...
Eagle Posted February 23, 2013 Share Posted February 23, 2013 Actually I take that back I almost forgot. The little rubber end on the cylinder piped off when I was bleeding my brakes. That's we're it leaks from. How could it pop off? First off, the rubber cap you can see is only a dust cap. The actual gland/seal is inside the cylinder. There are two, one facing front and one facing rear. Then there are two metal (or sometimes plastic or ceramic, I guess, but I'm ancient and I've only seen metal) pistons, then the rubber dust boots. If you have a pre-1990 MJ with Bendix drums, there should be short connectors that extend from the metal pistons to the front and rear shoes. If you have a 1990+ with 9" Chrysler brakes, the shoes contact the pistons directly. http://constructionforklifts.tpub.com/TM-10-3930-621-34/TM-10-3930-621-340128im.jpg With a bleeder screw open, you just can't generate enough pressure to pop anything. Please tell me you weren't bleeding the brakes before you reinstalled the brake drums ... Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 23, 2013 Author Share Posted February 23, 2013 How could it pop off? First off, the rubber cap you can see is only a dust cap. The actual gland/seal is inside the cylinder. There are two, one facing front and one facing rear. Then there are two metal (or sometimes plastic or ceramic, I guess, but I'm ancient and I've only seen metal) pistons, then the rubber dust boots. If you have a pre-1990 MJ with Bendix drums, there should be short connectors that extend from the metal pistons to the front and rear shoes. If you have a 1990+ with 9" Chrysler brakes, the shoes contact the pistons directly. http://constructionforklifts.tpub.com/TM-10-3930-621-34/TM-10-3930-621-340128im.jpg With a bleeder screw open, you just can't generate enough pressure to pop anything. Please tell me you weren't bleeding the brakes before you reinstalled the brake drums ... We had the drums on and when we bled them we saw it dumping fluid and were like wtf so we took the drum off and it was leaking out of the new cylinder . I just can't figure out why it would be leaking Link to comment Share on other sites More sharing options...
Eagle Posted February 23, 2013 Share Posted February 23, 2013 A very long time ago I needed to do a brake job before heading off for a weekend to pick up my then-fiancee in another state and from there trek over some mountains to visit her grandparents. To get it done, my brother came over and, while I did one side he did the other side. Cool, bro, thanks a million. As we started down the back side of the mountains, the brake warning light came on and the peddle dropped. Oh, bleep. Fortunately, the car was a manual transmission with a high compression V8 so there was plenty of compression braking available and we made it fine with only the front (disc) brakes. After I returned home from the weekend, I pulled the rear brakes apart to see what might have gone wrong. What went wrong was that my helpful brother wasn't as careful working on my car as I know he would have been on HIS car. He assembled on of the link bars between the piston and the brake shoe wrong, and it came off under pressure. Once the link was gone, there was nothing holding the pistol in the wheel cylinder, so it popped out. The parts were there and I was able to reassemble the wheel cylinder, but the fluid had ruined the brand new brake shoes on that side. And, of course, they don't sell brake shoes for just one side, so ... That was, IIRC, 1973. In the forty years since, I have never allowed anyone but me to work on my brakes. But I digress. The point of this shaggy dog story is simply that it is possible to put things together wrong, allowing a wheel cylinder to pop. Double check how everything fits together. Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 25, 2013 Author Share Posted February 25, 2013 A very long time ago I needed to do a brake job before heading off for a weekend to pick up my then-fiancee in another state and from there trek over some mountains to visit her grandparents. To get it done, my brother came over and, while I did one side he did the other side. Cool, bro, thanks a million. As we started down the back side of the mountains, the brake warning light came on and the peddle dropped. Oh, bleep. Fortunately, the car was a manual transmission with a high compression V8 so there was plenty of compression braking available and we made it fine with only the front (disc) brakes. After I returned home from the weekend, I pulled the rear brakes apart to see what might have gone wrong. What went wrong was that my helpful brother wasn't as careful working on my car as I know he would have been on HIS car. He assembled on of the link bars between the piston and the brake shoe wrong, and it came off under pressure. Once the link was gone, there was nothing holding the pistol in the wheel cylinder, so it popped out. The parts were there and I was able to reassemble the wheel cylinder, but the fluid had ruined the brand new brake shoes on that side. And, of course, they don't sell brake shoes for just one side, so ... That was, IIRC, 1973. In the forty years since, I have never allowed anyone but me to work on my brakes. But I digress. The point of this shaggy dog story is simply that it is possible to put things together wrong, allowing a wheel cylinder to pop. Double check how everything fits together. Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 25, 2013 Author Share Posted February 25, 2013 Turns out the part I got was defective I got the brakes on and fixed now time for new brake shoes agian on the side that was leaking and new master cylinder Link to comment Share on other sites More sharing options...
ParadiseMJ Posted February 25, 2013 Share Posted February 25, 2013 Just an aside... When you replace brake components, you should replace both sides at the same time. Cylinders, calipers, shoes, pads, everything in tandem. Link to comment Share on other sites More sharing options...
1987manche4x4 Posted February 25, 2013 Author Share Posted February 25, 2013 I replaced everything on the other but the cylinder Link to comment Share on other sites More sharing options...
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