1badzx12r
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posted August 01, 2014 10:09 AM
Stumped
Have a issue with the front brake master cylinder. After a couple days the brakes will loose pressure .Easy fix is to just loosen the bleeder on top and 1 pull of lever then the air is out. I've put a zip tie on the lever and hold pressure overnite and its fine .. Its never lost fluid I left the bike dirty for weeks to find the lost fluid nothing. But it always gets air into it if left sitting for a while. The last fix on another bike was to change master cylinder but I never found the issue. Of why it keeps getting air into system.
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MotoCycho
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posted August 01, 2014 03:38 PM
Will it pump up without bleeding? Could it be a bent rotor? If holds pressure while zip tied.. will it also hold pressure if the bike is not moved and it is not zip tied? If it is a bent rotor moving the front wheel at all will move the rotor to a different run out offset and push those pads back a little.
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1badzx12r
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posted August 01, 2014 05:47 PM
 Edited By: 1badzx12r on 2 Aug 2014 01:48
no rotors are not bent . no moving of the bike "parked not touched"and it still loses prime. must bleed to get brakes back . I've had bent rotors on other bikes and know what to look for but its not them. some how I think its sucking air at the fitting that the reservoir hose is at on the master cylinder. I've thread taped the bleeder beside it and changed it out . the only air in the system is always at that top bleeder
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INTIMIDA2OR
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posted August 04, 2014 04:43 PM
Sounds like the master needs to be rebuilt.
The seals are not doing their job anymore.
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'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 04, 2014 06:58 PM
quote:
Sounds like the master needs to be rebuilt.
The seals are not doing their job anymore.
to me the seals work I can ride it all day and its good to go . but when it sits it loses prime
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INTIMIDA2OR
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posted August 06, 2014 12:08 PM
quote:
quote:
Sounds like the master needs to be rebuilt.
The seals are not doing their job anymore.
to me the seals work I can ride it all day and its good to go . but when it sits it loses prime
Do you have to bleed the system to get the pressure back or can you simply pump the lever to get the pressure?
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'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 06, 2014 01:46 PM
I have to bleed it at the top bleeder buy the reservoir hose 1 pump and its good .Going to dissect it today and look inside the master cylinder
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INTIMIDA2OR
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posted August 06, 2014 01:51 PM
Yeah sounds like something is up with the master.
I think somehow its sucking air maybe from the reservoir.
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'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 06, 2014 07:44 PM
Edited By: 1badzx12r on 7 Aug 2014 03:45
ok went thru the master cylinder .what I found was dirty old gel up brake fluid in area the fluid never moves. I cleaned it . I also found a pin hole or made the pin hole while disassemble of the hose from reservoir. fix that .. now I will see if it holds prime till tomorrow
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INTIMIDA2OR
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posted August 07, 2014 09:14 AM
Nice hopefully that does it. Gotta be something stupid.
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'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 07, 2014 09:39 AM
13 hrs since finish repairs and all is good
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MotoCycho
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posted August 07, 2014 10:24 AM
1bad,
What brand is that master? Nissin, Tokico, Brembo? Got any pics? Filing this in my memory under "weird shit that is possible".
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1badzx12r
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posted August 07, 2014 11:29 AM
Edited By: 1badzx12r on 7 Aug 2014 19:31
Nissin .I had 2 of these that acted that way and both had the common denominator of gel fluid built up on the piston. between the 2 rubber seals . 1 had it on the little spring part that works a check valve when the piston moves and on the head surface of the check valve. both insides were dirty but both had clean fluid and both were from bikes that sat for awhile .after cleaning and reinstall they are both still working. I think I may have fixed them I'm unstumped
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1badzx12r
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posted August 07, 2014 11:39 AM
Edited By: 1badzx12r on 7 Aug 2014 19:40
I also have a few other secrets
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MotoCycho
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posted August 07, 2014 02:06 PM
quote:
I also have a few other secrets
If it's about hookers, I'm all set. 
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1badzx12r
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posted August 08, 2014 06:53 AM
Edited By: 1badzx12r on 8 Aug 2014 14:55
so far its still working but I think It feels a little mushier today than yesterday . so I re-bleed it and it did harden up. maybe leftover air from install . but I doubt it wishful thinking
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http://www.youtube.com/watch?v=S06nIz4scvI
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INTIMIDA2OR
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posted August 08, 2014 02:58 PM
____________
'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 11, 2014 01:32 PM
I FAILED ITS BACK TO WHAT IT WAS DOING
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INTIMIDA2OR
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posted August 12, 2014 12:29 AM
Fuck!
Do you have another good master you can try?
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'06 Passion Red ZX-14
*Lee*
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1badzx12r
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posted August 12, 2014 03:44 AM
No i'll have to purchase one.
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zixxer14
Pro
Damn that was Quick
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posted August 15, 2014 04:58 AM
My Triumph had the same kind of problem, never could cure it, sold the bike. Done. I would go with a Brembo master, killer quality but at a price.
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LAB3
Needs a job
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posted August 15, 2014 11:55 AM
quote:
No i'll have to purchase one.
Hi Robert,
I think I have a master cylinder from a 2007 ZX14. I still have a lot of odd parts from several years ago. I will look for tomorrow morning when ti's so darn hot. I will PM you tomorrow.
Louis
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1badzx12r
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posted August 15, 2014 04:57 PM
no need I destroyed the bike today and will not be rebuilding
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http://www.youtube.com/watch?v=S06nIz4scvI
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LAB3
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posted August 15, 2014 05:27 PM
????? what happened????
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1badzx12r
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posted August 15, 2014 07:19 PM
on the way to the race track with the bike in a enclosed trailer a tie strap broke and the bike fell and destroyed its fairings . in a fit of rage after discovering this I destroyed the rest of the bike. I had work for 2 months and a lot of money putting a mint 07 zx14 together to have this happen on the 1st run to the track. I will finish it off tomorrow then haul it to the scrap yard
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http://www.youtube.com/watch?v=S06nIz4scvI
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