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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 12-07-2012, 09:07 PM   #11 (permalink)
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old vs new
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Old 12-07-2012, 09:07 PM   #12 (permalink)
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https://www.evernote.com/shard/s113/...94e04ea31497ee

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Old 12-07-2012, 09:28 PM   #13 (permalink)
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it looks bad, but remember different makes of fluid have different amounts of dye and can be a bit deceiving. that is why I like Nulon
http://www.nulon.com.au/products/Bra.../#.UMKlZ_IY1ck brake fluid as it is clear with no colour at all making it easier to see if the fluid is depleted

BTW have you tested to see if it made a difference yet?
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Old 12-07-2012, 09:53 PM   #14 (permalink)
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I had the same issue happen on my thruxton. And i havent fixed it yet. Still have plenty left on my pads but my rotor is badly gouged and the pads are pretty torn up as well. THere is only 9k on the bike. Wouldnt mind hearing what the solution to your problem is
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Old 01-10-2013, 05:52 AM   #15 (permalink)
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Well I was going on a ride today and the issue is back. So that rules out brake fluid I think. However I was able to pull over and take a look at the reservoir, it was completely full. When I pressed the lever it pressurised then went back into the reservoir essentially re-filling it. I left it 20 min and it worked again.

Any suggestions guys? I came far to close to a junction today...

I was not on a long ride today and it wasn't super hot either.... I may have rode the rear brakes gently for a few min. Front brakes are fine.


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Old 01-10-2013, 07:32 AM   #16 (permalink)
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I'm surprised you see the level rise and fall (by much at least) in the reservoir, the fluid displacement is from the mastercylinder into the system and eventually the caliper, the level in the res' should fall over time as the pads wear but never rise again until the piston is pushed in when the pads are replaced.

Anyway if you system is going spongy and then coming back of its own accord this can only be fluid getting hot and boiling, also your comment on coming too close to a junction make me wonder if you are over working the rear brake and boiling the fluid? I know we all have our own plan when it comes to braking and which end to use, I'm a big rear brake fan but don't use it so much that I'd risk missing my stopping point if it failed as the front would be supplying the power. Mayby you need to look at how you use the brakes.
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Old 01-11-2013, 01:03 AM   #17 (permalink)
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hmmm looks like I better do another swap on the rear fluid. I have never seen anything like it but it was actually re-filling the reservoir to max from the half way point.

I don't use the rear brakes much, only when riding very slowly or coming to a gentle stop. It was a warm day, but nothing out of the ordinary which is why I can't see it being the fluid. The issue was gone for a month or so and I know on other occasions I have used the rear brake more...
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Old 01-11-2013, 08:38 AM   #18 (permalink)
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This isn't a joke, and the possibility is remote, but...
Are you sure your rear caliper isn't getting ready to fall off?
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Old 01-11-2013, 06:44 PM   #19 (permalink)
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This isn't a joke, and the possibility is remote, but...
Are you sure your rear caliper isn't getting ready to fall off?
Nah, bolts are on there nice and tight and not binding
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Old 01-12-2013, 09:53 AM   #20 (permalink)
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hmmm looks like I better do another swap on the rear fluid. I have never seen anything like it but it was actually re-filling the reservoir to max from the half way point.

I don't use the rear brakes much, only when riding very slowly or coming to a gentle stop. It was a warm day, but nothing out of the ordinary which is why I can't see it being the fluid. The issue was gone for a month or so and I know on other occasions I have used the rear brake more...
Is your reservoir filling when you press the pedal or when you release it?
If it raises as you press the pedal this could be a master cylinder seal problem, as the system volume decreases due to the piston movement the fluid must go somewhere, if this isn't going into the caliper then the only other place is back into the res' (baring a leak). Raising when you release the pedal (which was how I understood your post) doesn't make sense, where would the fluid come from, even if the caliper piston was somehow being pushed back this would only replace the volume released as the M/C piston withdraws.
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