Swing arm having gap at mounts

[Suzukian]

Running a street bike without a rear brake is foolish. If you don't understand gyroscopic precession and why the rear brake is so important, in so many situations, you may have no business riding motorcycles. A working rear brake allows you to lay down a bike when necessary to avoid a catastrophic accident. It allows you to come to a stop and have the handlebars to wobble. This is an every stop situation. Never run a bike without a rear brake. Never. We are trying to help you, possibly save your life, not argue or have a pi$$ing contest.

 

[Rich82GS750TZ]

Suzukian, this is not the first thread where I've tried to warn Ian against such an endeavor. Deaf ears, I'm afraid.

 

[timebombprod]

Suzukian, this is not the first thread where I've tried to warn Ian against such an endeavor. Deaf ears, I'm afraid.

He's absolutely right about this, at this point if something happens it's because my ignorance and idiocricy. I do want a rear brake no doubt it's just with the situation I've had of never having one I guess the urgency isn't there. But it's me being stupid!

It's not a contest or anything, I'm absolutely positive a rear brake would be nothing but beneficial. Why don't I put one on as urgently as other things, because I'm being stupid!

there will be one no doubt it just wont be right away, i havent even got the damn bike together yet.

 

[Suzukian]

I don't know if you have that machining skills, but you could make a square bracket, that is split in half, and can be bolted back together. Thick bracket would fit around the swing arm and have a bolt for attaching the rear brake caliper. I could show you in a CAD picture, but I charge $100 bucks an hour to engineer such things, but if you get the idea, you may be able to find steel square stock that will work, and then do what is necessary to hold the caliper in place. As long as the brake line doesn't kink, the position radially doesn't mater, so your bracket could theoretically put the caliper where ever you want it around the center of the axle. I wouldn't go through all this trouble to change something that works so well, and is so functional. Do you have a milling machine and a Mig Welder, these would help, a lot, if you want to do things you own way. Do you find yourself looking at rear brake arms a lot, I don't.

I do most of my CAD modeling with Rhino3D by McNeel. I teach it on my forum. My point is very talented people offer their suggestions for free on this forum. When I trained machinists, I told them they had to do it my way, once they mastered it, if they had an idea, I would look at it, but that time was a long way off. I rarely got a suggestion that was better than what I was doing. This covered manual machines, 4 5, and 8 axis CNC machines, which I programmed and designed the fixtures, and some specialized end mills for composite materials. I had no one to teach me anything. You are getting loads of advice, and writing off experienced people. Soon, no one will read you posts. I turned 65 today. I am always so grateful when I learn something, even though I am at the "Winter of my discontent".

Sample; A paper model I designed from "Battlestar Galactica", unfolds and is completely build-able, not available at this moment.

 

[Rich82GS750TZ]

I NEED that paper viper model!

 

[timebombprod]

honestly what im thinking about is having a super simple brake setup in the rear, i just made a quick mockup but i think it explains it well as theres not much going on

itd be an axle with a spring return to keep it from moving that would have a pedal on one end for my foot obviously, and a "clamp" that would wrap around the brake disc when i use it.

ofcourse the long tube would be the axle, the circle that is above and at the middle of the axle would be the mount, the line going from the mount to the axle would be the return spring, on the right side is the brake pedal, and the left would be that "clamp"

the clamp itself would have a hard rubber composite on the inside while the actual clamp itself would be metal, now if a rubber composite isnt enough ofcourse id still figure it out, but as i see it id use it as a normal brake, now it might be more sensitive and easy to cause your rear to skid, but i could test like the hardness of the composite that works as the brake pad or give something a bit of flexibility so its not a consistent force being applied to the brake but one that has some play.

its just a rough draft, i know this could definitely work, but how well is really what id need to learn.

i do have access to many many machining tools im very lucky to have the friends i do, i also have a TIG and MIG welder at home.

 

[Grimly]

You could arrange it so the friction surface is inside a rotating short cylinder and that would give a self-servoing action. Maybe even then add another one and keep both of them in synchronisation by a simple cam arrangement.
I'm sure it can be worked out...

 

[1978GS750E]

honestly what im thinking about is having a super simple brake setup in the rear, i just made a quick mockup but i think it explains it well as theres not much going on

itd be an axle with a spring return to keep it from moving that would have a pedal on one end for my foot obviously, and a "clamp" that would wrap around the brake disc when i use it.

ofcourse the long tube would be the axle, the circle that is above and at the middle of the axle would be the mount, the line going from the mount to the axle would be the return spring, on the right side is the brake pedal, and the left would be that "clamp"

the clamp itself would have a hard rubber composite on the inside while the actual clamp itself would be metal, now if a rubber composite isnt enough ofcourse id still figure it out, but as i see it id use it as a normal brake, now it might be more sensitive and easy to cause your rear to skid, but i could test like the hardness of the composite that works as the brake pad or give something a bit of flexibility so its not a consistent force being applied to the brake but one that has some play.

its just a rough draft, i know this could definitely work, but how well is really what id need to learn.

i do have access to many many machining tools im very lucky to have the friends i do, i also have a TIG and MIG welder at home.

Why not just get a concrete block and a long piece of rope????

Do you really think you can build a rear brake that works better than the Suzuki engineers designed???

 

[Rich82GS750TZ]

A boat anchor would be more apropos.

 

[timebombprod]

im not saying better by any means!

 

[fastbysuzuki]

I have probably have missed something ​​​​​, is it not easier to get the original brake working? Running around on roads without a rear brake is really not sensible and down right dangerous.

 

[Rich82GS750TZ]

I have probably have missed something ​​​​​, is it not easier to get the original brake working? Running around on roads without a rear brake is really not sensible and down right dangerous.

You haven't missed anything. This is precisely the point we're all trying to make.

 

[Who Dat?]

Suzukian, up until now, I have only noticed good stuff coming from your keyboard. However, this part makes me nervous:

Running a street bike without a rear brake is foolish. If you don't understand gyroscopic precession and why the rear brake is so important, in so many situations, you may have no business riding motorcycles. A working rear brake allows you to lay down a bike when necessary to avoid a catastrophic accident. It allows you to come to a stop and have the handlebars to wobble. This is an every stop situation. Never run a bike without a rear brake. Never. We are trying to help you, possibly save your life, not argue or have a pi$$ing contest.

Is there a chance you have a history of riding Harleys? "Laying a bike down" to avoid a collision only means you will have TWO collisions. The first one is the one where you hit the pavement AND LOSE ANY FURTHER CONTROL, the second is when you eventually hit what you were hoping to avoid.

 

[allojohn]

Yes, ... LOL! another "I had to lay her down" disciple ... such bullsh!t.

 

[Suzukian]

Never owned and only have ridden a few Harleys. My CB400F is a Modified Stage III CB458 c.c. by Kazio Yoshima, I've have been clocked at 135 miles per hour doing 14,500 rpm's, using 3.50 x 18" in" rims (aluminum, Gold anodized, stainless steel spokes I laced) in the rear. Yoshima made me Hand bent pipes, turned my carbs into smooth bores, and flow benched the carbs into the heads, though to the exhaust. It is a rare bike,1977, and is more rare now. I have used the rear brake to lay the bike down at slow speed turns on back Connecticut roads when either deer have jumped out, or I was just going too fast. I also have been offered big bucks for that bike, as I have all the paperwork and work orders signed by Kazio Yoshima himself.

If you have never laid down a bike, and walked up to it, and just picked her up, with nothing wrong except some scratches on the clip on handlebar ends, and the rear set Futuro foot pegs, you weren't riding past the edge like I was. I was much younger and learning. I am talking about a bike laid over, rolling off the tires, on a decreasing radius off camber turn. Why do an endo, or try and stand it up, only to high side it off the other side? I always ride fully dressed for the occasion. So yes, I have laid motorcycles down a few times, and have had very controlled lay downs, in which the bikes suffered virtually no problems. I've never had to lay down my '83 GS750ES since new, and it's clicking on 40K miles. My CB454 Yoshima will roll off the tires, and nothing will touch, or even come close.

Also, where in my post did you see the word "Collision"? I never used that word. You obviously (You plural) have never done extreme back road riding where there are no cars, and the challenge is yourself. As far as collisions go , the shift would puts all the weight on the front wheel, but I did not write "collision", that is the only thing a rare brake isn't good for, it happens to be the only time where it does very little.

Read the posts more thoroughly before you post. If you read the post, and questioned me to enhance your understanding of how I rode, and maybe what I meant, because you obviously have not come even close to what I have done on motorcycles, I would have happily educated you. Lay a bike down on a hard curve, where your rolling off the tires, I'll go for a controlled lay down than a "leave it to the God's" attitude every day of the week. There are no sidewalks inn Connecticut back roads, for the most part, it's grass and lots of rocks, which I'd rather kick the bike away from me than get tangled up with it.

You assume much. The only bullshlt is coming from two people who don't read posts correctly and are too lazy to inquire further. Use bullshlt to anything I am saying, make sure you smell your own breath, that's where the bullshlt smell is coming from. Your whole reply was based off of the word "Collision" which I never posted. What a bunch of maroons.