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1VJ - Drum to Disc swap 1VJ - Drum to Disc swap
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  #1  
Old 22 Jan 2010
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1VJ - Drum to Disc swap
Hey all...

I want to swap the drum on the back of my 1VJ for a disc, so i'm thinking 3AJ Parts should slot straight in - rear wheel, disc, caliper and bracket, master cylinder and pedal.
I know i'm gonna have to make up mounts for the master cylinder, but is there anything else im gonna have to look out for?
Is a 1VJ swingarm the same as a 3AJ?

I know of a master cylinder and all pipework for a 3YF going cheap.....anyone think of a reason why this wouldn't be any good?

Any advice, suggestions, comments, or parts (especially free parts) gratefully accepted.........

Cheers.
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  #2  
Old 22 Jan 2010
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I dont see why it shouldn't be possible, but in the same breath I wouldn't hope that the brake is any better tbh. The 3AJ brakes, mine at least and I have spent enough time trying to improve them, are diabolical single pot affairs that take a lot of pressure to get the desired effect and even then it's just enough to get past the MOT.
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Old 22 Jan 2010
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I bought new grippier pads for the rear disc brake on my TTR but never really noticed any difference, you can lock it up by standing on it but i'm sure you could with drum rear brakes, I'd say they're just about adequate.

I had some I think they're called 'twin leading' drum brakes on one Bike and crikey them things could stop and nothing subtle about it.
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  #4  
Old 22 Jan 2010
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You will need to weld a threaded boss to the top of the swingarm on the caliper side, there is a long slot on the caliper that bolts to it, the slot allows for chain adjustment.
I think it's M8.
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  #5  
Old 22 Jan 2010
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I had '91. XT600E with rear disc brake, and braking was not better than current drum on '85 XT400. I know it's odd, but to me drum brake seems better :confused1:
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Old 22 Jan 2010
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Quote:
Originally Posted by svakak View Post
I had '91. XT600E with rear disc brake, and braking was not better than current drum on '85 XT400. I know it's odd, but to me drum brake seems better :confused1:
Yep makes no difference to me too if you regularly clean the inside of the drum up.
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Old 22 Jan 2010
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Quote:
Originally Posted by Panzer View Post
I had some I think they're called 'twin leading' drum brakes on one Bike and crikey them things could stop and nothing subtle about it.
TLS drums are great, but only on the front end - on the rear are a really bad idea! They self-servo magnificently going forward, but if you need to stop the bike from rolling backwards they don't really work. All rear drums are/were SLS for that reason, I think.
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Old 23 Jan 2010
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Seriously, I cant think of a reason why you would want to go through that much trouble for the rear brake, the drum is more the sufficient if you at least keep it clean with new shoes.

Realistically you are better off getting braided brake lines for more feel.

If your drum is badly worn then you may need to to replace the drum itself.
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  #9  
Old 23 Jan 2010
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The rear disc on my TTR600RE is too sharp ! What with the engine braking too... It locks up regularly on the road.
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  #10  
Old 23 Jan 2010
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Quote:
Originally Posted by BlackDogZulu View Post
TLS drums are great, but only on the front end - on the rear are a really bad idea! They self-servo magnificently going forward, but if you need to stop the bike from rolling backwards they don't really work. All rear drums are/were SLS for that reason, I think.
Yes it was on the front of some terrible terrible CCM enduro lol machine that i'd never heard of before and I doubt anybody off here as either but boy could it stop ( thats all it could do, I'd sooner put nobblies on a CX 500 and call it a Moto X bike)

It was then I was told CCM stands for ConCrete Mixer.
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Old 23 Jan 2010
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Hi,

I noticed this on Eb*y, which may be of interest?
YAMAHA XT600 TENERE,XT 600 SWINGING ARM [ 3AJ ] on eBay (end time 09-Feb-10 21:34:56 GMT)
There are other bits as well (including a frame, etc...).

Ciao,
Geoff
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  #12  
Old 25 Jan 2010
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As most replies so far seem to suggest that disc isn't really that much better than drum is it worth the weight penalty of going to disc? Conversely, I am always looking out to buy a drum hub wheel so that I could think about retro fitting drum brake in place of disc. Precisely to save weight...... oh, and I dunno about anyone else with disc rear, but I get through 3 sets of rear pads to 1 set on the front.
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  #13  
Old 27 Jan 2010
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Hey all,

Thanks for all the info and advice, seems like i won't be bothering with that little mod then.......
To be honest there's nothing wrong with the rear drum, it works well. It was just really a case of "reckon that could be a sweet little mod"

Thanks again.
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