snobbly Posted March 17, 2014 Report Share Posted March 17, 2014 Any pointers please for fixing my back brake - its gradually got weaker and weaker and now doesnt work at all. The caliper moves a bit on one side but not the other. I've taken the wheel off, cleaned it all, pads are almost new, brake pedal all seems OK but I dont really know what I'm looking for. need to get it sorted before last weekend of the month as there's finally a practice I can go to locally !!! many thanks Quote Link to comment Share on other sites More sharing options...
jackthelad98 Posted March 17, 2014 Report Share Posted March 17, 2014 Have you tried bleeding the brake or just topping up the oil pot? just a thought, good luck Quote Link to comment Share on other sites More sharing options...
inchhigh Posted March 17, 2014 Report Share Posted March 17, 2014 Is the Brake pipe ok?mine cracked at the banjo at the master cylinder end . Another thing it could be the seals are worn in the master cylinder. Quote Link to comment Share on other sites More sharing options...
cactusjack Posted March 17, 2014 Report Share Posted March 17, 2014 I had a next to useless back brake on my Scorpa, when I bought it. I have spent countless hours trying to get it sorted, until Saturday night when I finally did. I was getting zero pressure from the master cylinder because the push rod adjustment was up the ***** and there was air in the line. Because the piston was being pushed prematurely, it wasn't allowing it to return all the way, stopping the fluid from returning to the reservoir. I started by figuring there was air in the line. I tried bleeding and couldn't get anything to happen. I soon realised that the push rod was not returning far enough and had to remove the brake pedal to get correct adjustment. This was a task as the bolt was rounded out and way over tight. I ended up drilling the head of the bolt off, then punching the bolt through. I wrecked 5 drill bits on the hardened bolt!! Once I was able to reduce the adjustment on the push rod, I could then get enough pressure from the pedal to bleed the brakes properly. Once I had got a result from here I was able to set up the rear brake to my liking and sort out my woes. It took some time but at the end of the day all was well and good. Good luck with it mate, and make sure you have everything adjusted correctly in the pedal area before you start to bleed the system. Quote Link to comment Share on other sites More sharing options...
snobbly Posted March 17, 2014 Author Report Share Posted March 17, 2014 the fluid cylinder is full, i did try bleeding it but not sure I was doing it right, loosened the nut per the picture in the manual, fiddled with the brake, bit of fluid came out then I tightened it up again. I can't see any leaks or cracks in the pipe, even after I cleaned the mud off ! the rubber bit on the bottom of the brake cylinder is quite loose and moves around - can't see inside the cylinder though. How would I know if the seals have gone or do I just get new ones ( is it the whole cylinder or can I just get the seals ??) many thanks Quote Link to comment Share on other sites More sharing options...
cactusjack Posted March 17, 2014 Report Share Posted March 17, 2014 (edited) Snobbly, Google is your friend mate. You need to ensure the system is bled properly before you do anything else. Try this one: I didn't watch it all but thought it may give you some guidance on what you need to do. Start there as brake fluid can absorb water over time and this will reduce your brake pedal feel too. Flushing and replacing your fluid is definitely step number one. Edited March 17, 2014 by cactusjack Quote Link to comment Share on other sites More sharing options...
cactusjack Posted March 17, 2014 Report Share Posted March 17, 2014 (edited) Oh and pull your pads out and push the pistons all the way back in too, this will "reset" the pistons and seals and get both pistons free and moving again. Edited March 17, 2014 by cactusjack 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted March 17, 2014 Report Share Posted March 17, 2014 The pads are very small in the first place. I`ve seen long time riders do this. Are you sure you just don`t need new pads? Quote Link to comment Share on other sites More sharing options...
snobbly Posted March 17, 2014 Author Report Share Posted March 17, 2014 Thanks for the vid link - i can watch that at home ( as clearly hard at work at the moment !!) - I'll have another look at the pads and try pushing the pistons back, its definitely only moving on one side so cant be completely right. thanks again Quote Link to comment Share on other sites More sharing options...
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