feltd
New Member
Posts: 10
Likes: 1
Registered: Oct 6, 2017 13:45:15 GMT -7
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Post by feltd on Feb 25, 2024 17:35:13 GMT -7
I was changing out tires so had front out and was going to clean up the brake pistons as I noticed one of the four seemed to be stuck.Yes ,got too greedy and I was pulling lever to push out a whisker more and one piston popped out along with some brake fluid.Damn.Clean up and pop piston back in Ok, care on the others and cleaned the protrouding piston(s) surface clean.
New fluid along w/ bleed will not fix.* Always air bubbles still burping back into the reservoir.Very spongey,hardly any bite on rotors.* front wheel on stand and spinning free. Odd that no leak externally but is it possible that the pressure seal is drawing air in ?Prior to this I had zero brake experience.
The dust seals are just exactly that and only the pressure seals are issue?* I bled till blue in the face both front calipers.Anybody can weigh in please?
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Post by willl84 on Feb 26, 2024 4:54:20 GMT -7
Did you make sure the seals were in their respective grooves properly before putting the piston back in? I've had pistons pull a ring out before. Also did you make sure to bleed at the caliper? How did you do your bleeding?
Don't forget there's an ABS pump the fluid needs to go through as well. I had to crack the banjos at the pump once or twice when I installed my new lines and was bleeding everything. A helper works best, someone to pump the lever and keep the res topped up while you crack banjos and bleeder screws.
Make sure to keep shop towels and brake cleaner around everything you crack as brake fluid will ruin paint.
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terrys
Full Member
Posts: 104
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Registered: Mar 1, 2021 0:48:28 GMT -7
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Post by terrys on Feb 26, 2024 12:37:59 GMT -7
Might be time to buy yourself a vacuum bleeder ( the cheapest at Harbor Freight is $25)to help to pull fresh fluid down from the reservoir to the calliper. I'd be close to 100% sure that your issue is as simple as air in the line.
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feltd
New Member
Posts: 10
Likes: 1
Registered: Oct 6, 2017 13:45:15 GMT -7
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Post by feltd on Feb 26, 2024 16:03:50 GMT -7
Thanks gents.Neither the dust seal or the pressure seal fell out...the 1 of 4 pistons only fell out.I bled @ both caliper bottoms using tight silicon tube to bottle.I also pulled out from bottom w/50 ml syringe ...many times.Always have some bubble comes into reservoir when I pull brake lever which is why I thought one or both seals may be sucking air IN.I will reverse bleed* get a bigger syringe and push from botttom .I will also look @ how to engage or power up the ABS pump?* Some guys say they do not need to but I will certainly do if I can.
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Post by willl84 on Feb 27, 2024 5:00:42 GMT -7
I didn't have to power the ABS pump when I swapped my lines out, just had to crack the bajo's on the pump with pressure held on the lever(s). That's strange that it's being such a pain to bleed. I've only had one bike that was that much of a pain and it was a GSXR 600 that my cousin bought that I was fixing up for him. I bled that thing 5 different ways multiple times and couldn't get a firm lever feel, but the brakes worked fine and there was no bubbles coming out.
If there's still bubbles coming out into the res then there's still air in there for some reason. Whether it's getting pulled in somewhere or what is the question. It sounds like you've bled the system pretty thoroughly so it sounds like there's something funny going on.
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