Main Motorcycle: '07 Bonneville
Join Date: Jun 2011
Location: New York City
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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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
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.
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