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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 09-11-2011, 01:42 AM   #1 (permalink)
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Leaking front brake fluid reservoir

My front brake fluid reservoir on my '07 Bonnie just won't stop leaking after bleeding my brakes for the first time. I've taken the lid off and cleaned and dried all the contact points and gasket, tightened the screws, but I continue to get a trickle right next to the inside screw. The paint on the triple tree has bubbled and been ruined from the leak. I've read on here that people have bought after market covers which seemed to solve the problem, but is there a cheaper fix? The gasket itself looks fine as does the white plastic piece.
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Old 09-11-2011, 04:41 AM   #2 (permalink)
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The parts that can cause this are available separately. If the cap appears to be straight and not warped, try changing the rubber bit or diaphragm, it's only about $14 (£10). It's probably settled and compressed beyond its ability to seal against the reservoir and reservoir cap.

Part to ask for is:
DIAPHRAGM. RESERVOIR Part Number: T2026017
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Old 09-11-2011, 11:09 AM   #3 (permalink)
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Thanks, Forchetto. Will definitely inspect the cap first to make sure it's not warped or milled poorly.

Does anyone know if the upper yolk assembly are just factory powder coated? They have a dullish textured quality to them and when I do re-powder coat it, I want to try and match it with the bottom yolk as much as possible.
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Old 09-11-2011, 12:45 PM   #4 (permalink)
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Quote:
Originally Posted by Forchetto View Post
The parts that can cause this are available separately. If the cap appears to be straight and not warped, try changing the rubber bit or diaphragm, it's only about $14 (£10). It's probably settled and compressed beyond its ability to seal against the reservoir and reservoir cap.

Part to ask for is:
DIAPHRAGM. RESERVOIR Part Number: T2026017
Thats what I did with the wifes T100 , all ok now.

Plasma.
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Old 09-11-2011, 02:34 PM   #5 (permalink)
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Had the same trouble on the wifes Bonnie black I tried everything and gave up. I noticed when bleeding the brake the fluid pumped a jet upwards when the lever is released and finds its way to the breather holes. In the end I cut a sleev off an old fleece and fitted it around the res. Like GP bikes?......
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Old 09-11-2011, 02:39 PM   #6 (permalink)
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Don't overtighten it trying to stop a leak. I've found that tightening often doesn't stop seepage and sometimes makes it worse. If judicious alignment and careful, even, gentle tightening don't stop it, do as the others advise and get a new gasket, then only tighten it enough to provide a good seal.
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Old 10-03-2011, 04:28 PM   #7 (permalink)
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I ended up purchasing and installing a new rubber diaphragm for my leaking reservoir issue. However, I'm still getting the same leak, always coming from one particular side (inner side).

The actual reservoir cover doesn't look warped or damaged and obviously kept a seal before I removed it to flush/bleed the brake fluid for the first time. So before I blow another $50-60 on a new cover, hoping that'll be the fix, is there anything else I can do or that I'm missing? Could the culprit be the white plastic piece that goes between the cover and diaphragm?

This is driving me crazy, especially considering I've already paid a hefty price in paint damage/loss on my top yoke assembly.


BTW: Looking at the bike bandit schematic ('07 Bonneville), I don't see a listing for the white plastic piece that's sandwiched between the reservoir cap and diaphragm. Rather odd...

Last edited by francypants; 10-03-2011 at 04:39 PM. Reason: Addition
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Old 10-17-2011, 04:01 PM   #8 (permalink)
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Fancy,

I had the same problem the brake fluid residue followed the brake line and found paint on the triple tree and ate a quarter size of it off. No leak from the line it was from the master cyl cover not from the screws, from the border of the cover. I took it off and cleaned everything real good topped off master cyl then carefully put back together. It hasn't leaked today and I was favoring the front brake in an attempt to make it leak and could not get it to leak. I will keep a close eye on it though. I would like to get a new bonneville finned chrome cover but don't want to buy it now just to fix a leak from stock parts. I may invest in new rubber if it starts up again. Fancy, How much was your diaphram???

Now I have to figure out how to touch up the black paint on the upper tree. I was upset when i saw it but glad it was in an inconspicuous place.

Last edited by sw9mm; 10-17-2011 at 04:04 PM.
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Old 10-18-2011, 12:26 AM   #9 (permalink)
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Quote:
Originally Posted by sw9mm View Post
Fancy,

I had the same problem the brake fluid residue followed the brake line and found paint on the triple tree and ate a quarter size of it off. No leak from the line it was from the master cyl cover not from the screws, from the border of the cover. I took it off and cleaned everything real good topped off master cyl then carefully put back together. It hasn't leaked today and I was favoring the front brake in an attempt to make it leak and could not get it to leak. I will keep a close eye on it though. I would like to get a new bonneville finned chrome cover but don't want to buy it now just to fix a leak from stock parts. I may invest in new rubber if it starts up again. Fancy, How much was your diaphram???

Now I have to figure out how to touch up the black paint on the upper tree. I was upset when i saw it but glad it was in an inconspicuous place.
The diaphragm was $15. When that didn't fix the issue, I was gonna order a replacement OEM cap which is around $18. However, I didn't want to chance encountering the same issue, so I invested in a pricey milled Joker cap. I installed it the other day after a day of riding, so I have yet to see if it fixes the issue. It seems substantially beefier.

I'm probably going to have to re-PC my yoke as the paint loss is pretty significant.
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Old 10-21-2011, 03:55 PM   #10 (permalink)
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cheap quick fix is to put red rtv around the seam after you tighten it down. It won't be pretty...but it shoud stop the weeping. Just be sure to peel the film carefully (maybe with a fine grit scouring pad) if you need to remove.

Ive found that it would weep for a few days and then eventually stop for mine. I just make sure to monitor the fluid level on the site glass.
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