Mechanical and Technical For mechanical and technical discussion


 
Old May 29th @ 02:48 pm   #11
2upFZ1's Avatar
 
From: NLV - Lone Mt & Clayton

Motorcycle: 2002 Yamaha FZ1
Go to the Kawi site and go to "Owner Info", then "Parts Diagrams".
http://www.kawasaki.com/DefaultFrame...OSEVEHICLE.ASP

Put in the year and model, and then choose "rear master cylinder" once the list on the left pops up.

There you will see an exploded view of the rear master cylinder. There is a spring that is in with the piston. Either it is corroded, or you got some trash in the valve keeping the fluid from returning into the reservoir.

Also, if at any time you got some moisture in there, it will corrode the brake parts on the inside. Which might account for the sticking.

Brake fluid absorbs water out of the air, so make sure that you close up the bottle of fresh fluid tight. And don't leave the cap (reservoir or bottle) off for any longer than needed.

Everyone should flush their brake system every couple of years just to get that old fluid out, and any moisture that it has absorbed.

 
 
Old May 29th @ 02:56 pm   #12
loic's Avatar
 
From: las vegas

Motorcycle: 2002 ZZR 1200,2005 ZZR 1200, 1984 shadow VT700, 1999 Vstar 1100 custom
thanks, I guess , i'll take appart that cylinder today... I have 1 more bottle of brake fluid so I'm good !! on the diagram they call it : spring master cylinder, anyway that's the only spring in there...so it got to be that one !!
 
 
Old May 29th @ 03:06 pm   #13
GoFast's Avatar
 
From: North
Quote:
Originally Posted by loic View Post
a ZZR 1200. so maybe my problems is coming from that cylinder.
also when I pushed the pads away I heard some air ( pfffffttt) coming from the cylinder.
I 'm pretty sure my brake are bleed properly, and I used the mighty vac pump , it's a lot easier...
yeah i would definatly use a power bleeder. and do it several times.
 
 
Old May 29th @ 03:12 pm   #14
2upFZ1's Avatar
 
From: NLV - Lone Mt & Clayton

Motorcycle: 2002 Yamaha FZ1
Make sure that the passageways inside the cylinder are clean, and the piston is clean as a whistle. Not even lint from the rag on either one.

As Arson mentioned, it might be a buildup of brake dust around the caliper piston not allowing it to return back into the caliper.

Oh, are the rear pad springs still there?
 
 
Old May 29th @ 04:00 pm   #15
loic's Avatar
 
From: las vegas

Motorcycle: 2002 ZZR 1200,2005 ZZR 1200, 1984 shadow VT700, 1999 Vstar 1100 custom
Quote:
Originally Posted by 2upFZ1 View Post
Make sure that the passageways inside the cylinder are clean, and the piston is clean as a whistle. Not even lint from the rag on either one.

As Arson mentioned, it might be a buildup of brake dust around the caliper piston not allowing it to return back into the caliper.

Oh, are the rear pad springs still there?


there is no spring at the pads. there is 2 "clips"that hold the pads and 1 "clip"that hold the pin that goes into the pads
 
 
Old May 29th @ 04:17 pm   #16
2upFZ1's Avatar
 
From: NLV - Lone Mt & Clayton

Motorcycle: 2002 Yamaha FZ1
The ones at the pads are the ones I was referring to. They don't do much as far as retracting the pads, but they do help keep them centered when retracting.

Last edited by 2upFZ1; May 29th at 04:17 pm. Reason: sp
 
 
Old May 29th @ 04:19 pm   #17
loic's Avatar
 
From: las vegas

Motorcycle: 2002 ZZR 1200,2005 ZZR 1200, 1984 shadow VT700, 1999 Vstar 1100 custom
Quote:
Originally Posted by 2upFZ1 View Post
The ones at the pads are the ones I was referring to. They don't do much as far as retracting the pads, but they do help keep them centered when retracting.
ok, well they're both there..... I'm gonna try and check the spring in the cylinder and rebleed everything. i'm gonna start in about 30 minutes....so we'll see..
 
 
Old May 30th @ 10:13 am   #18
loic's Avatar
 
From: las vegas

Motorcycle: 2002 ZZR 1200,2005 ZZR 1200, 1984 shadow VT700, 1999 Vstar 1100 custom
well i took apart the master cylinder, the calipers ( again) cleaned everything, put it back and bleed it. but it does the same thing, it seems that when the brake is applied a little, then the piston retract, but if I put a lots of pressure on the pedal then the pads get stucks....
also both pads are wear down a lot more on the bottom than the top of the pads....which doesn't really make sens....
 
 
Old May 30th @ 10:15 am   #19
2upFZ1's Avatar
 
From: NLV - Lone Mt & Clayton

Motorcycle: 2002 Yamaha FZ1
What year and how many miles on your ZZR?
 
 
Old May 30th @ 10:21 am   #20
2upFZ1's Avatar
 
From: NLV - Lone Mt & Clayton

Motorcycle: 2002 Yamaha FZ1
If the pads are tapered, they might be jamming in the caliper, and not retracting straight.
 
 

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