I think the rear master cylinder died.

katoranger · 02-07-2008, 07:25 PM

I haven't ridden in about 3 weeks and I went out to start of the 2 and the rear brake was sticking. Cracked the bleeder and now I can't build any pressure. Resorvoir has plenty of fluid and was not low.

I think that the rear master may be done. I will have to see if I can vacuum bleed it but it may be time to see if I can do a honda conversion.

Allen

culcune · 02-07-2008, 10:09 PM

I think that was part of the reason Lifan went back to the rear drums on the GY-5's.

I know that Jetmoto has the parts on their site. My Jetmoto, right before taking its final dump, had lost its rear brake after sitting for so long. I would have ordered the part, but the bike went bye bye

ejcycles · 02-08-2008, 07:42 AM

Allen
I have some new master cylinders in stock... I'll see if they will fit the Lifan.

katoranger · 02-08-2008, 09:18 AM

I was doing research a few months ago when I was having troubles with it before and it looked like a master from a honda cfr230 I think might fit.

They looked close in design.

Bruce, let me know what you got.

Allen

katoranger · 02-09-2008, 11:20 AM

This is the rear master on the GY2.

And this is one from a late model honda cbr600.

The mounting points on both are opposite of the resevoir line and the clevis on the plunger is similar.

Might be close enough for a swap.

Allen[/img]

AZ200cc · 02-09-2008, 12:02 PM

Looks like the one my Maxfine had also, Probably a standard china part

katoranger · 02-09-2008, 12:05 PM

I am sure that most of the china bikes had a similar unit. I found that master on ebay and ask the seller to measure the mounting points for me.

I think most of the trouble being had with the rear brakes is caused by the master cylinder.

Allen

fatboy250 · 02-11-2008, 08:42 AM

Quote:

Originally Posted by katoranger

I think most of the trouble being had with the rear brakes is caused by the master cylinder.
Allen

Ours wasn't really a problem with the master cylinder, but rather the location in relation to the push rod for the the cylinder which was causing the brakes to not completly disengage.

Jason

katoranger · 02-11-2008, 01:11 PM

The master seems to have quit completely not. I have adjusted it out and that worked great for months. Now I either have some large air bubble in the line or the piston seal is gone giving me no pressure. I am going to try to vacuum bleed the system to see if the works.

I got a response back on the CBR master and the mounts are 1.75 inches apart. I will have to measure to see if that will fit.

Probably going to be my alternative if the bleeding don't work.

Allen

katoranger · 02-12-2008, 05:43 PM

I spent about an hour trying to bleed the system and I got nowhere. The master just won't build any pressure.

Anyonw have any suggestions?

Allen

AZ200cc · 02-12-2008, 05:45 PM

Is it leaking past the seal that You can tell?

katoranger · 02-12-2008, 05:47 PM

I think that is where the problem is. I some some air bubbles down there.

I believe I am going to try the cbr master and see if that works.

Allen

culcune · 02-12-2008, 06:12 PM

Quote:

Originally Posted by katoranger

I spent about an hour trying to bleed the system and I got nowhere. The master just won't build any pressure.

Anyonw have any suggestions?

Allen

Not being too familiar with brakes, but having the exact same thing happen to my Jetmoto, the cylinders seem to give up, and you might as well replace it. I had priced one for under $40 direct from Jetmoto, but if the CBR one fits, you should be in business.

Like I said a few posts up, I think this is why A. Lifan went back to a rear drum brake!

katoranger · 02-12-2008, 06:15 PM

I believe that is what happen. I can get a honda one for about $20 shipped off ebay.

Probably last forever on there too.

They are lots of them on ebay. They don't seem to sell quick and it is probably because they don't break.

Allen

AZ200cc · 02-12-2008, 06:39 PM

I've never torn one apart, I wonder if it just uses an O ring on the piston.....Coudl be a simple rebuild job.

02-07-2008, 07:25 PM	#1
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I think the rear master cylinder died. I haven't ridden in about 3 weeks and I went out to start of the 2 and the rear brake was sticking. Cracked the bleeder and now I can't build any pressure. Resorvoir has plenty of fluid and was not low. I think that the rear master may be done. I will have to see if I can vacuum bleed it but it may be time to see if I can do a honda conversion. Allen __________________ You meet the nicest people on a Honda Clone.
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02-07-2008, 10:09 PM	#2
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,056	I think that was part of the reason Lifan went back to the rear drums on the GY-5's. I know that Jetmoto has the parts on their site. My Jetmoto, right before taking its final dump, had lost its rear brake after sitting for so long. I would have ordered the part, but the bike went bye bye __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
	0

02-08-2008, 07:42 AM	#3
ejcycles Join Date: Oct 2006 Location: 11481 State Route 44 Mantua, Ohio 44255 Posts: 1,112	Allen I have some new master cylinders in stock... I'll see if they will fit the Lifan. __________________ Thanks, Bruce @ Endless Journey Cycles "Phone Calls Only" ~330-274-0098~ Hours: Tue.-Fri. 10:00-6:00 Sat. 10:00-4:00 EST. Dealer for: Lifan, Crossrunner ATVs. http://www.endlessjourneycycles.net
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02-08-2008, 09:18 AM	#4
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I was doing research a few months ago when I was having troubles with it before and it looked like a master from a honda cfr230 I think might fit. They looked close in design. Bruce, let me know what you got. Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-09-2008, 11:20 AM	#5
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	This is the rear master on the GY2. And this is one from a late model honda cbr600. The mounting points on both are opposite of the resevoir line and the clevis on the plunger is similar. Might be close enough for a swap. Allen[/img] __________________ You meet the nicest people on a Honda Clone.
	0

02-09-2008, 12:02 PM	#6
AZ200cc Join Date: Apr 2007 Location: Show Low Arizona Posts: 2,889	Looks like the one my Maxfine had also, Probably a standard china part __________________ <br />2001 Suzuki DR200SE<br />1997 Suzuki RM250 YIKES<br />1995 Yamaha Breeze 125 daughters<br />1991 Honda XR80r Restored<br />maybe a 2003 Yamaha TTR90
	0

02-09-2008, 12:05 PM	#7
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I am sure that most of the china bikes had a similar unit. I found that master on ebay and ask the seller to measure the mounting points for me. I think most of the trouble being had with the rear brakes is caused by the master cylinder. Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-11-2008, 01:11 PM	#9
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	The master seems to have quit completely not. I have adjusted it out and that worked great for months. Now I either have some large air bubble in the line or the piston seal is gone giving me no pressure. I am going to try to vacuum bleed the system to see if the works. I got a response back on the CBR master and the mounts are 1.75 inches apart. I will have to measure to see if that will fit. Probably going to be my alternative if the bleeding don't work. Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-12-2008, 05:43 PM	#10
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I spent about an hour trying to bleed the system and I got nowhere. The master just won't build any pressure. Anyonw have any suggestions? Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-12-2008, 05:45 PM	#11
AZ200cc Join Date: Apr 2007 Location: Show Low Arizona Posts: 2,889	Is it leaking past the seal that You can tell? __________________ <br />2001 Suzuki DR200SE<br />1997 Suzuki RM250 YIKES<br />1995 Yamaha Breeze 125 daughters<br />1991 Honda XR80r Restored<br />maybe a 2003 Yamaha TTR90
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02-12-2008, 05:47 PM	#12
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I think that is where the problem is. I some some air bubbles down there. I believe I am going to try the cbr master and see if that works. Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-12-2008, 06:15 PM	#14
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I believe that is what happen. I can get a honda one for about $20 shipped off ebay. Probably last forever on there too. They are lots of them on ebay. They don't seem to sell quick and it is probably because they don't break. Allen __________________ You meet the nicest people on a Honda Clone.
	0

02-12-2008, 06:39 PM	#15
AZ200cc Join Date: Apr 2007 Location: Show Low Arizona Posts: 2,889	I've never torn one apart, I wonder if it just uses an O ring on the piston.....Coudl be a simple rebuild job. __________________ <br />2001 Suzuki DR200SE<br />1997 Suzuki RM250 YIKES<br />1995 Yamaha Breeze 125 daughters<br />1991 Honda XR80r Restored<br />maybe a 2003 Yamaha TTR90
	0