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Old 04-08-2016, 01:39 PM   #1
elFix
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Default RT2 front brake improvement

Any suggestions on how to make the factory brake a bit better?

I have tried a few different brands of shoes, replaced the cable and lever, polished the cam and lubed everything that moves, and monkeyed with the arm geometry.... yet the brake on this thing is still marginal at best. I haven't had the pads arced to the hub but they all have shown decent contact when marked and used, so I'm not convinced that would help a lot. I realize the brakes on these were never terrific, but I'd like it to be sorta good if that's possible.

Has Yamaha made a twin leading shoe brake for any other machine that might fit this hub? I'm toying with the notion of trying to fit an RD200 wheel and relaceing it to a 19" rim..... or perhaps seeing if I can adapt the big XS-1 wheel that's hanging on the wall of the barn.

Any assistance would be most welcome.
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Old 04-08-2016, 03:16 PM   #2
dtmeis
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The best and easiest fix is to swap out the wheel, hub and cable to the 74 and later conical style hub....great braking action IMHO
Two fingers is all you need !

Here's what it looks like installed on my 360...

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Old 04-08-2016, 04:20 PM   #3
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I recently ran into this same problem after quickly slapping a bike together for a ride event in Colorado.

The cause of the problem is a worn out brake lining in the hub itself.
The enlarged/worn internal diameter causes the brake shoe cam to over-rotate, and thus lose it's leverage. No amount of adjustments or new parts will fix the problem . . . short of installing a better brake hub that isn't worn out.

DTmeis rode my DT360 in Ouray, and immediately noticed the lack of front braking power . . . then promptly offered to adjust it for me.

Rather then explain the situation too him, I just said "no thanks ... I want the adjustment left right where it is". He was probably scratching his head about that one! . Earlier, I had discovered that tightening the brake any further than what I had it at, would cause the brake shoes to constantly drag on the drum.

. . . So Dave, if you're reading this . . . now you know the rest of the story!
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Old 04-08-2016, 06:53 PM   #4
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Yes EN ......now I fully understand !
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Old 04-08-2016, 11:28 PM   #5
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So is the later conical hub a direct bolt on? Will the speedometer still work? Did you have to ditch the original front fender to accommodate the 21" tire?

I doubt the hub I have is worn out given the very low mileage of the bike and the lack of a ridge line inside the hub... perhaps I'm simply expecting too much from the standard set-up.
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Old 04-09-2016, 07:15 AM   #6
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Two things to try 1st.
1) take a "DA" or other self stick sand paper stick it to a brake shoe.
2) install wheel adjust brake for slight drag spin wheel until drag is gone.
this will remove any brake build up on the hub.

3) now arc the shoes by sticking sand paper to the drum.
4) Repeat #2
5) clean with air no chemicals to shoes.
6) go ride.
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Old 04-09-2016, 08:22 AM   #7
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Did you know that drums can be re-lined?
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Old 04-09-2016, 02:40 PM   #8
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Quote:
Originally Posted by 44dwarf View Post
Two things to try 1st.
1) take a "DA" or other self stick sand paper stick it to a brake shoe.
2) install wheel adjust brake for slight drag spin wheel until drag is gone.
this will remove any brake build up on the hub.

3) now arc the shoes by sticking sand paper to the drum.
4) Repeat #2
5) clean with air no chemicals to shoes.
6) go ride.
Well, that certainly couldn't hurt. I'll give it a go and report back.

dtmeis- I'm still curious about the wheel swap. Also, perhaps its just the camera angle but your RT2 seems to have more space between the tank and head than mine- do you have a dropped frame?

My RT in its natural habitat:

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Old 04-09-2016, 08:40 PM   #9
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Quote:
Originally Posted by elFix View Post
Well, that certainly couldn't hurt. I'll give it a go and report back.

dtmeis- I'm still curious about the wheel swap. Also, perhaps its just the camera angle but your RT2 seems to have more space between the tank and head than mine- do you have a dropped frame?

My RT in its natural habitat:

Elfix your bike looks great !

Yes my frame has been lowered a few inches.....there is quite a bit of "daylight" between the head and gas tank.

The stock speedo and speedo cable works with the later setup.

Here's a closer view of my frame...

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Old 04-14-2016, 10:34 AM   #10
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Default Better brake?

I am not positive-positive this will work for you, and is probably a bit of overkill in the dirt, but I suspect pretty strongly that a DLS (double leading shoe) front brake from a DS7 or R5 from the same era may well fit your bike. You might need to trim an axle spacer to make it fit between your fork legs.

Either this or the RD200 as you mention will get you a DLS brake, although the other options mentioned already may well be all you need to get yours to work better. I would probably try to make what I had be the best it could be before moving on to another brake entirely.

On the other hand, if you are riding on the street a great deal, the DLS may be more desirable.
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