Z1R Front Master Cylinder Rebuild Kit Substitute

Attention member D3:
I just sent you an email regarding your new diaphragms. If for some reason you do not receive it, please contact me at jstephens7@wi.rr.com for instructions on how I order at least one of these.

Thank you, Godffery

Godffery’s Garage
tinyurl.com/yfrw4fc
8010 Gateway Drive,
Burlington WI. 53105

dohc wrote:

saxjonz wrote: I pulled lever in and tied it to the handlebars and left it overnight. The next day voila, it worked. Now,

I did this accidentally. Spent an entire afternoon trying to bleed my 650 but no matter what I did the lever just pulled all the way to the grip. I eventually gave up and walked away, but when I came back the next day it had fixed itself. Gravity!! But there is no reason to lock the lever in. That would just block the ports to the reservoir. If this method is going to work, gravity will either bring the air to the top or it won't. The lever position doesn't matter.
I think that, in my case, there was air in the slave. By tying the brake to handlebars it allowed it to fill. I left it for several weeks before I came back to it and it still wouldn't pump up. When I read about this little trick it worked the very next day caliper pumped up perfect.




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I don't get on the forum very often but I'm glad that you found hole to be blocked and hope that you get it going. I am still trying to get the other gremlins fixed that are preventing me from riding this old girl. Just glad those will be easy fixes unlike the front brakes.

Got one of those carb jet cleaners on order so when that arrives I'll be able to clean out the relief port - will hopefully get some time this weekend to have another go at bleeding the front brakes. If I still have trouble I'll have a go at D3's suggestion to elevate the calipers above the m/cyl. (Bit hard to get the T-junction elevated as it's an integral part of the m/cyl and there's not much flexibility in the short hose from the reservoir to the m/cyl) Will keep you posted. Bill.

weales wrote: If I still have trouble I'll have a go at D3's suggestion to elevate the calipers above the m/cyl. (Bit hard to get the T-junction elevated as it's an integral part of the m/cyl...

The lack of a splitter/T-junction actually should help, as this is one less piece where a bubble can hide.

I finally found my micrometer. The wire I used as a gauge pin measures 0.0181", just as the amazon review suggested.

The relief hole would be a tiny bit bigger than this. Rounding up to the nearest fractional millimeter, 0.5mm would be 0.0197". I'd buy that...

Ok - I will be getting a carb jet tool this week so will clean out the relief hole to that dimension (ie 0.5mm) The hole that I have poked through with a needle is about half this, so it's obviously still got some junk jammed in it! Will post an update on progress - either positive or negative

I'll be buying a set of digital calipers as well to help with this little task - I've been promising myself one of these for a while now - have been getting by with borrowing one. They are a very handy tool and local auto parts outlets have them for around $30 (although if you want the "Rolls-Royce" version the sky's the limit).

Just wanted to give a shout out for member D3: regarding his new Z1R Master diaphragms.
Got'm, Love'em, Worked Great, Thank you very much !

Godffery wrote: Just wanted to give a shout out for member D3: regarding his new Z1R Master diaphragms.
Got'm, Love'em, Worked Great, Thank you very much !

Can thoroughly add my thanks to D3 - and all who have contributed to this thread! You guys have helped me heaps with my brakes rebuild! - yes finally got the front brakes assembled and bled successfully! :woohoo:
I've been persevering with the bleed but with no success - even after opening the blocked relief port and re-assembling the whole shebang VERRY carefully per the w/shop manuel. Last night I was about to cover her up again and have a beer when I noticed that the lever wasn't coming right to the h'bars. So, I adjusted this (the Z1-R has a cable operated, remote m/cyl) and had another go (I also gave both calipers a bit of a work back and forth as they hadn't moved even a poofteenth of an inch).
This time a lot more air bubbles appeared in the bleed hose, which was promising and the caliper I was working on actually moved onto the disc and I got some resistance at the lever. I thought "gotcha,!" I bled the other side and hey, hey more air bubbles then clear fluid from this side too, with really good pressure at the lever! I let it sit for a while to savour the success, then bled a bit more fluid through - just to confirm and all was good.

Glad I didn't have to elevate the calipers above the M/Cyl as this would have been pretty tricky in my Un-TARDIS workshop (ie actually smaller once you get inside!). Anyway, I still have a cheesy grin on my face ! Cheers all,
Bill.

Everyone usually likes to see pix, so here are a few of the set I rebuilt with the help of D3's parts.

Great info. I am just starting to tackle this job now.
The bleed hole on my master is plugged also.
I am going to order the parts from Z1 and D3.
Thanks guys.

Vary helpful older thread, thanks to everyone who posted on here..................But I need some help

Last year front brakes worked fine. Over the long winter I move bike and front brakes lock up. I rebuilt everything on front brake assembly per this thread. Bleeding, I get nice clean fluid out of the left front caliper and nothing from the right. Not even a drop of brake fluid at the M/C port, nothing. I can put finger over hole and pump brake lever and there will be a suction at my finger but no fluid. not a drop. I'm stumped

GregZ wrote: Vary helpful older thread, thanks to everyone who posted on here..................But I need some help

Last year front brakes worked fine. Over the long winter I move bike and front brakes lock up. I rebuilt everything on front brake assembly per this thread. Bleeding, I get nice clean fluid out of the left front caliper and nothing from the right. Not even a drop of brake fluid at the M/C port, nothing. I can put finger over hole and pump brake lever and there will be a suction at my finger but no fluid. not a drop. I'm stumped

I would think the only way for one side to work and the other Not, is a straight up clog in that junction? Still, that would be the first time I ever herd of that happening.?!