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Discussion Starter · #1 · (Edited)
Rebuilding brakes on '86 fourtrax TRX350

Moose called it in my other thread about the suspected faulty master cylinder, and suggested to check for leaks in the drum.

I found the leak. The cylinder on the left.



What is the kit or parts called that I need to get, and should I do both sides at the same time, or just this one? The other side isn't leaking.
 

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It it was mine I would replace every thing In the above pic. The other side just shoes, springs and keepers as long as there is no leaking.
 

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Discussion Starter · #4 · (Edited)
To clarify what you said, you would replace on this drum, items:

1, cup piston
8, springs [X2]
9, shoe clamps [X2], are these the keepers you mention?
14, piston [This item is not available]
17, lock spring
18, washer
20, adjuster nut
21, adjuster screw
22, wheel cylinder boot
28, o ring

That's the part list for the left cylinder, and you would also replace the corresponding parts for the right cylinder on this left-front drum?

What about the piston, item 14 that is not available. Reuse the old one?

And then for the right-front that is not leaking, just the shoes, springs, and the keepers, which are the clamps, item 9?

http://www.bikebandit.com/houseofmo...rtrax-4x4-1986-fr-brake-panel/o/m2623sch22820
 

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20 and 21 you could most likely reuse make sure they move freely.You could eliminate 22,14 and 1 by getting 23: CYLINDER B, R. FR..The way it shows on the blow up it should also come with 20 and 21.As for the Right front... Yes shoes clamps and springs.


 

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Discussion Starter · #6 ·
Unless I'm reading it wrong, item 23 is not available, which is why I bought all seperate parts. If it's available, I'll just buy that for sure.

Thanks for the help.
 

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Oh yeah your rite Its n/a...MY bad:rating01:
 

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Discussion Starter · #8 ·
So that means that item 14 is also not available....so I just reuse my old piston and hope for the best?
 

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Yeah unless you could find one at a dealer.
 

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keep in mind you cannot reuse the shoes if they have been saturated with fluid, they will swell and deteriorate. Also if you rebuild the cylinders make sure you get a brake cylinder hone they are pretty inexpensive.
 

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Discussion Starter · #11 · (Edited)
So I just insert the hone into the cylinder and spin it in a drill a little to smooth off the walls, or is there more to it than that?

Also. Can I just remove the 4 visible bolts, and the brake line from the back side, and remove this whole assembly to work on it, or is there more to it than that? I don't see anything else in the service manual.

 

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Insert into the bore and move the stones from front to back but not all the way out as they rotate to create a cross-hatch pattern.Yeah you should be able to remove that whole housing by removing the bolts.Heres a short vid so you get an idea..
http://www.youtube.com/watch?v=f-shtKfy6u8
 

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Discussion Starter · #13 ·
I got a new brake drum on ebay [along with the whole front end, knuckles and brakes for left and right side] and just bolted it on. Bled the brakes, adjusted both sides, and I now have front brakes. Need to run the overnight pump-up-the-lever-and-secure-with-tie-wrap test, but it seems to be sorted. :)
 

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Unless I'm reading it wrong, item 23 is not available, which is why I bought all seperate parts. If it's available, I'll just buy that for sure.

Thanks for the help.
Just an after-the-fact-FYI: The brake cylinder assembly is available on hondapartsnation.com as well as the individual brake piston parts, and I've found they've had better prices for everything I've looked at for my '86 TRX350. I haven't actually bought anything yet though, so I can only say what I see on the site.
 

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Discussion Starter · #15 · (Edited)
Thanks for the information.

After much looking and ordering and then disappointment, it appears that bikebandit actually has accurate inventory methods. i.e. if the part is greyed out on bikebandit such that they won't let you order it, then it's unavailable. Ihaven't used the site you linked though.

The other sites will show the part and allow you to order it, and then a day or 2 later will tell you it's unavailable.

What I usually do now, is look it up on bikebandit, and if it's available there then I will try to find a lower overall price for my order at another site. Like I said in another thread, cheap cycle parts has good prices, and seem to always be the lowest I've found by a significant amount, which is the only reason I have used them at all.

As for the brakes, if you crack yours open and find a leaking cylinder, I have 3 of the 4 available. I have the one in this photo on the right [this is the left drum], and I have a complete right drum with both cylinders and good brake shoes. This drum obviously would need new shoes and a left cylinder, but the right cylinder is good once you cleaned it up.
 

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I finally got my right front brake apart today, the castle bolt was pretty stubborn. Here it is. (look familiar!?)



So the cylinder on the left seems to pump fine, but the one on the right doesn't move at all. This seems strange to me, as I would have thought if one cylinder was bad you'd lose pressure to both (?). I'm going to try taking it apart and getting all the grime cleaned off so I can get a better idea of what's going on. If anything in particular in this picture jumps out at anyone feel free to let me know :unsure:
 
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