- what've i done to my brakes?
Dales_rider will probably explode but if they were spongy before and dead now, it suggests they had air already hanging around in the system and it’s got somewhere you don’t want it. (pushing back the pads moves a lot of fluid fast so though logically it shouldn’t cause air to get in- since you’re pushing fluid up into the reservoir- in practice unpredictable things can happen with bubbling, pushback etc.)
Have you tried the bodger’s classic of tying back the levers and leaving them for a while? Not really a fix in my book but a useful diagnostic (if they start working then it’s definitely air)
People bleed too often when it’s not the problem, but, sometimes it is.Posted 5 years ago
Rockhopper – Member
2. When you pulled the lever without the pads in you have popped one of the pistons right out and let a load of air into the system.
Ooh, that’s not likely, takes a bit of work to get them back in unless you’re freakishly lucky but even then it ought to be noticable… But then if you’re not familiar with brakes, maybe not. OP, did you see any fluid escape?Posted 5 years agoAristotleMember
Air has possibly been pushed up into the master cylinder (something that is rarely mentioned in fluid changing/bleeding guides).
If so, it can take a while to displace it.
Take the reservoir cap off and, quickly & repeatedly, squeeze/release the lever part-way back. you may see small bubbles rising through the reservoir. Stop and repeatedly tap the master cylinder and hose area with the (soft/rubbery) handle of a large screw-driver. Resume squeezing the lever.
Keep doing it until the bubbles -eventually- stop. the lever should now have firmed-up.Posted 5 years agojdwafcMember
Strip all system, recheck & clean (around pistols) reassemble, bleed system, to align fresh pads have caliper bolts loose a little, put a playing card between each pad & disc, now a firm grip on brake handle (keep hold) to centre caliper, tighten bolts up remove card, clean disc properly (use disc cleaner) test, check for leaks and your off.Posted 5 years ago
Also don’t touch ya pads, if you do, sand them a little and use disc cleaner.
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