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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 12-22-2008, 01:12 AM   #1 (permalink)
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Brake bleeding problems

I've been a member sinse 05 and I've been browseing for information when I need it every sense. I appreciate all the great information and I apoligize that I have not posted till now. I usually manage to get by but this time Im going to need help.
I have a 05 speedmaster of my own. But at the moment I'm working on a 03 Americia for my little brother. And as I'm putting it together. I can not get any pedal on the rear brake. I've refilled the Resevoir over ten times. I'm not getting any more air out of the bleeder. And the pedal still goes straight down and bottoms out.
There is no leaks, No lost fluild and its not taking in air. So to keep a long story short. I'm looking for a second opinion. Do I need to replace the piston kit inside the master cylinder? Does anybody have experiance with this?

Thank you,
Mathew Watts
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Old 12-24-2008, 01:47 PM   #2 (permalink)
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It could be that the m/c piston seal is stuffed, going on what you said that would be my opinion?

Try taking the caliper off [don't disconnect the hose though] and turning and twisting it around then put it back on and see if you get any air, they sometimes trap air in them.

Also try posting in the metric twin forum part?
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Old 12-24-2008, 02:15 PM   #3 (permalink)
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I took the liberty of moving this thread to the appropriate forum.

If you've refilled the reservoir more than once or twice, you DEFINITELY have a leak.
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Old 12-24-2008, 10:32 PM   #4 (permalink)
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Fist off I apoligize GrandPaulZ. For placing this post in the wrong forum. Thanks for relocating it. Hopefully it will help another person someday.
As far as my brake issues. I got that one solved. This bike was reassembled by me. After the previous owner disassembled it to get some parts chromed and do some impact repairs. So The master cylinder, Ridgid lines, rubber brake line, and caliper were all bone dry when I started.
I was bleeding these brake by hand with my brothers asistance, then switched to a one man brake bleeding bottle. We bleed them for half hour getting all the air out the would come out of the zert fitting. Once the air stopped comming out and we still had no pedal. Then after more bleeding. We suspected the master cylinder. But the next morning we rented a mity vac and got more air. So I relized the possiblity of still haveing air in the system was likley.
I first bleed the brakes at the bango bolt on top of the master cylinder, then again under the bike and the banjo bolt were the final brake line connect to the rigid line, once more at the caliper, and finally reconnected the mity vac to the zert fitting And we got the pedal a pretty good pedal. So sorry for the long story but the problem was still air in the system.
The pedal still isn't the way I would like it to be. It is solid but there is some travel on the pedal before the pressure is felt. Unlike my 05 speedmaster. And before this bike hits the road that problem will be fixed also. The brake pads are still at 80% or better. If it is still more air in the system, or some freeplay adjustment I don't yet.

Thank you all greatly,
Mathew
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Old 12-24-2008, 10:38 PM   #5 (permalink)
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Matthew, have you tried speedbleeders? Look them up--I just got a set for my thrux and have used them for my 911. They are absolutely invaluable and the best $20.00 you'll ever spend.

J
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Old 12-24-2008, 11:30 PM   #6 (permalink)
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"J" Where did you get the speedbleeders? I asked the guy at the autoparts store and he looked at me like I told him aliens have landed.
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Old 12-25-2008, 12:03 AM   #7 (permalink)
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I had to bleed the rear brake when I relocated the m/cylinder and reservoir due to the Scrambler mods on my T100. I tried for hours to get a pedal,there was a thread on here with some good advice but still I couldn't get pressure. Ended up borrowing a brake bleeding apparatus from a H D store, two minutes and I was finished. The thing I borrowed plugged into an air line and pushed the fluid through. Chances are that your plumbing is good, just need the right buddy to borrow gear off.
Oh,just saw the time. Merry Christmas.
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Old 12-25-2008, 09:45 AM   #8 (permalink)
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Brake line air purging

Due to installing handlebar risers on my T100, I had to go to a longer front brake line.
Since this resulted in totally air-filled lines, I used a large syringe with some silicone tubing (model airplane fuel line) connected to the bleeder nipple.
Pulling the brake fluid through from the reservoir does a good job of purging the large volume of air from the system.

As for the speed bleeders; I have them, and IMO, they do NOT work at all!
I tried getting the last bit of firmness in the lever and pedal by depressing them completely with the "speed bleeder" just cracked far enough to allow fluid to flow out. I found that releasing the lever or pedal BEFORE completely closing the "speed bleeder" resulted in air being sucked back into the system.
Ie; the "internal check valves" were NOT working.
So, I do the last bit of bleeding via the old method of applying pressure to the lever or pedal, cracking the bleeder, and closing it again while there is still travel left in the lever or pedal.
I received no instructions of any kind with the "speed bleeders", so if anyone can advise me on any special operating procedure I may be disregarding, fire away!
Bob
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Old 12-25-2008, 09:59 AM   #9 (permalink)
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Quote:
Originally Posted by MWatts9728 View Post
"J" Where did you get the speedbleeders? I asked the guy at the autoparts store and he looked at me like I told him aliens have landed.
British Customs. Their site is down now else I'd give you the link..You simply unscrew the old nipples, screw in the new ones--important--make sure you stop when you hit resistance else they'll strip--then you unscrew 1/4 to 1/2 turn , connect a bottle with a hose to it, pump the brakes while you add new fluid (different color helps) until you see it coming into the bottle, screw the bleeder back in and bob's your uncle.

No air can get back into the bleeder with its valve. Jack
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Old 12-26-2008, 12:17 AM   #10 (permalink)
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I have to go order a new brakeline for the front wheel. And when I get it I'm going to spend more time getting the brakes to 100%. For now I just needed to know the the system works. Before I place an order for parts. The speed bleeder deffinatly sound like an option. But I think I can get this the old fashion way.
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