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GL1200, what size rear master cyl. line fitting's?

941 Views 8 Replies 8 Participants Last post by  Bike...and Dennis
I flushed out the brake lines to the rear and front right calibers on my 84 1200, I can"t get anywhere trying to bleed it the conventional way, and I don't have a power bleeder, I'm going to try to start a the rear master cyl..there are two brake lines going in the top of the cyl., one goes to the rear caliber and the other to the front right, I want to try to start the bleeding there, will that work as long as the master cyl. is good? It worked for the clutch, I couldn't get anywhere bleeding the slave cyl. but when I started at the banjoe fitting at the master cyl. it worked great, and then I bleed the slave cyl., And what size are the brake line fittings that go in the top of rear cyl.?
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I flushed out the brake lines to the rear and front right calibers on my 84 1200, I can"t get anywhere trying to bleed it the conventional way, and I don't have a power bleeder, I'm going to try to start a the rear master cyl..there are two brake lines going in the top of the cyl., one goes to the rear caliber and the other to the front right, I want to try to start the bleeding there, will that work as long as the master cyl. is good? It worked for the clutch, I couldn't get anywhere bleeding the slave cyl. but when I started at the banjoe fitting at the master cyl. it worked great, and then I bleed the slave cyl., And what size are the brake line fittings that go in the top of rear cyl.?
Get you some speed bleeders, (recent convert).

You have a split brake system, the rear brake operates the rear and right front brake rotors, the handlebar lever only operates the left front brake.
I flushed out the brake lines to the rear and front right calibers on my 84 1200, I can"t get anywhere trying to bleed it the conventional way, and I don't have a power bleeder, I'm going to try to start a the rear master cyl..there are two brake lines going in the top of the cyl., one goes to the rear caliber and the other to the front right, I want to try to start the bleeding there, will that work as long as the master cyl. is good?
No need to go at the rear master loosing lines, sounds like it is not pumping and needs a re-build. Or just better technique.
Buy a vacuum pump.
You will wonder how you ever got along without one.
Buy a vacuum pump.
You will wonder how you ever got along without one.
I have a vacuum cleaner somewhere, would that work?:?

Actually I spotted a Mighty-Vac in a pile of junk my brother-in-law inherited from a friend. As he had no idea what it was it's now sitting on my bench.:ROFL:
For your last question , -The brake line fittings are 10/1/5 mm. , - as far as i remember .
The 1200 has linked brakes that can be hard to bleed the conventional way. A vacuum pump should help, but in my opinion Speedbleeders are the ONLY way to go. It just doesn't get any simpler. I tried them for the first time on the Goldwing, and was so impressed I'm going to put them on everything I have that they will fit.
Looks like I will be using nearly all of these tips to get my rear MC back in order but before I even get there I can't get my hard line nuts to thread into MC again. I can get it when I have the lines and MC outside the frame, npbit mot at all when in position. I fear the threads on the nuts are too far gone and am contemplating nipping the line and replacing the line nuts and reflaring the line. So..... I am looking for anyone with experience and a better way to stop me before I do something REALLY stupid.

I borrowed a thread restoring kit but neither the m10x1.25. Nor the m10x1.5 is the right thread much too course.
So can someone with a manual clue me into the correct thread?
Looks like I will be using nearly all of these tips to get my rear MC back in order but before I even get there I can't get my hard line nuts to thread into MC again. I can get it when I have the lines and MC outside the frame, npbit mot at all when in position. I fear the threads on the nuts are too far gone and am contemplating nipping the line and replacing the line nuts and reflaring the line. So..... I am looking for anyone with experience and a better way to stop me before I do something REALLY stupid.

I borrowed a thread restoring kit but neither the m10x1.25. Nor the m10x1.5 is the right thread much too course.
So can someone with a manual clue me into the correct thread?
First off, welcome to the forum. :waving:
I would advise against your plan to replace those nuts. I just don't see that working out for you. And I can't remember how I got mine back in place but I remember it wasn't easy so...

...Start a new thread. Hijacking this 2 year old thread won't get you the help you need. Please include the year and model in the thread title.

Also, please fill out your profile. City, State, Year and Model of bike. It helps us all communicate better and may get you some hands-on help if you're near a mechanically inclined member.
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