fullscreenaging Posted July 7, 2014 Share Posted July 7, 2014 I've just put my be pads in tonight and had a bit of trouble pushing the pistons in on the left calliper. Right calliper of pins and pads out. A good squirt of brake cleaner, soft bristle toothbrush scrubbed over pistons then pushed in. New pads and pins back in and calliper back no probs.Left calliper off pins and pads out, spray of cleaner. Push one piston in then push it's twin in and the first one pops back out. I don't gave a proper tool for pushing the pistons back in, but the right calliper had no issues. Anyway I got a bit of wood and pushed one pair in. Pushed the opposite pair in and the first pair came back out. Took me ages to get them out enough so I had enough room to get the new pads over the disk.Can someone in the know tell me the cause of this? Do I have dodgy seals on that side or something else?Thanks in advance Quote Link to comment Share on other sites More sharing options...
GazW Posted July 7, 2014 Share Posted July 7, 2014 They were moving freely so I doubt your seals were at fault, unless you could tell they were perished.Did you have the top of the fluid reservoir off? Quote Link to comment Share on other sites More sharing options...
fullscreenaging Posted July 7, 2014 Author Share Posted July 7, 2014 No left the top on Quote Link to comment Share on other sites More sharing options...
GazW Posted July 7, 2014 Share Posted July 7, 2014 A braking system will hold more fluid with the pistons out than with them fully in. As you've pushed them in you've probably filled the reservoir, then the fluid had nowhere to go other than in between the two sets of pistons. You would have compressed all the air left in the reservoir, next time you do it just whip the top off if it then the air can escape. Quote Link to comment Share on other sites More sharing options...
fullscreenaging Posted July 7, 2014 Author Share Posted July 7, 2014 Makes sense. I did open the bleed nipple and let a bit of fluid out. Obviously not enough. I think this will be my next job tomorrow.Thanks Quote Link to comment Share on other sites More sharing options...
Stu Posted July 7, 2014 Share Posted July 7, 2014 personally I would be looking at the other side to see why its not moving as freely as that caliper you have a good working caliper there the other one isnt so good Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted July 8, 2014 Share Posted July 8, 2014 fluid level doesnt increase in the system a a whole it might be having trouble returning to master cylinder and as stu says both sides should be as free as the other,releasing fluid via the bleed nipple might well result in lack of fluid in master cylinder next time pads get low so keep an eye on fluid level as pads wear down Quote Link to comment Share on other sites More sharing options...
DreamytimeEscorts Posted July 8, 2014 Share Posted July 8, 2014 I can't help with your diagnosis but water pump pliers are ace for getting pistons back in. Quote Link to comment Share on other sites More sharing options...
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