spungey brakes


Information and questions on GL1100 Goldwings (1980-1983)
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mrrotervater
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Location: Co.Kerry. Southern Ireland
Motorcycle: 1981 GL1100. Interstate

spungey brakes

Postby mrrotervater » Sun Oct 24, 2010 10:28 am



I have a 1981 gl1100 and have just fitted a new tire. now I find that the front brake lever comes all the way back, if I pump it it gets a bit of pressure but as soon as I try to pull it up it is soft and will not stop the bike, I have bleed the system over and over but still the same, it was hard and had only a small amount of travel before I removed the wheel. I held the pistons back with clamps so they would not travel out, but on putting the wheel back and pulling the lever they are very soft. Do you think the master cylinder needs renewing? or what else can I try.



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WingAdmin
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Re: spungey brakes

Postby WingAdmin » Mon Oct 25, 2010 9:45 am

You've either got very soft brake lines (not all that likely), or (most likely) still have air in your brake system. What method are you using to bleed the brakes?

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thrasherg
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Re: spungey brakes

Postby thrasherg » Mon Oct 25, 2010 10:39 am

Also check that the pads are moving freely. If they jamb in the carriers then you will force them onto the disk (actually bending the pads) and when you release the brake lever they will spring back forcing the pistons back further than intended.. this can cause the brake lever to move far more than expected and cause spongy feeling, but I think wingman is closer to the cause.. How did you bleed your brake system, remember most wings brake systems are linked to the rear brakes so the bleeding procedure is very different to a normal bike.. Describe how you bled them and we might be able to shed some light on what went wrong.

Gary

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WingAdmin
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Re: spungey brakes

Postby WingAdmin » Mon Oct 25, 2010 12:06 pm

They didn't start linking brakes until 1983, so he's safe from that nightmare with his 1981. :)

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mrrotervater
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Location: Co.Kerry. Southern Ireland
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Re: spungey brakes

Postby mrrotervater » Mon Oct 25, 2010 2:52 pm

I put a tube on the nipple and into a jar, the book says use a 12ml. spacer between the lever and the handle bars. undone and pumped the lever NO air came out. then done the other side, you say that something could be jammed, I have noticed a click noise coming from the front calliper, that it did not have before. I cannot see a problem with the way it went back together. I will strip it again and recheck how it went back. after bleeding them again this afternoon they were a bit better but after pulling the lever a few times it is the same, the lever goes all the way to the handle bars with very little effort. I tried the pumping off the lever then opening the valve closing and letting go of the lever, but it was the same.

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mrrotervater
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Re: spungey brakes

Postby mrrotervater » Mon Oct 25, 2010 3:22 pm

just been out to the workshop again ( my wife thinks i have gone mad ) and checked the calipres again, removed them and put them back, still the same but a small bit better, one thing comes to mind when they wheel was off the pads were not put back in the same places as before, would they need seating in to the disc?. I am going to Cobh tomorrow for a few days, will drop into Lee motor cycles to see if they have a master cylinder kit, it will do no harm as I have not had the bike long and do not know how long the rubbers have been on the bike. I did notice some very small air bubbles coming up the holes in the bottom of the filler tank. It will elimenate that side anyway.

goldtr6c
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Re: spungey brakes

Postby goldtr6c » Mon Oct 25, 2010 4:37 pm

Air bubbles tend to migrate upwards to the top. Cover up your tank. Pump it up, hold it and crack the banjo bolt at the top by the master cylender. Any air in the hose will come out here. Repeat a couple times. When you get the air our then bleed at the bottom to get all the old fluid out.

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thrasherg
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Re: spungey brakes

Postby thrasherg » Mon Oct 25, 2010 10:56 pm

Another trick is to pump up the brake system until you get lots of pressure, then put a cable tie around the brake lever and lock it in against the handlebar. Air bubbles tend to be quite large in the brake system and have a hard time rising to the top. If you pressurise the system by pumping the lever until you get a lot of pressure, the bubble gets compressed and is much smaller and can rise to the top more easily. Usually you pump the brake system up until you get a lot of pressure, then cable tie the brake lever to the handlebar and put the bike on it's side stand with the handlebars turned to the left (get the reservoir to the highest position) then leave it for 24 hours. When you get back in 24 hours remove the cable tie and then try the brakes again.

Gary

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mrrotervater
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Re: spungey brakes

Postby mrrotervater » Wed Oct 27, 2010 3:16 am

trying to order new master cylinder kit but they want the model number. where do i find that? any help as I am on holiday and have to ask a non biker to find it.

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WingAdmin
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Re: spungey brakes

Postby WingAdmin » Wed Oct 27, 2010 10:23 am

Who are you trying to order it from?

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mrrotervater
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Re: spungey brakes

Postby mrrotervater » Wed Oct 27, 2010 11:08 am

MDgoldwings
Martin and Debs Steele
MD Goldwings
44 Kylemilne Way
Stourport-on-severn
DY13 9NA

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WingAdmin
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Posts: 17050
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: spungey brakes

Postby WingAdmin » Wed Oct 27, 2010 11:49 am

Are they looking for the model number of the bike? The part number of the master cylinder? That would probably help zero in on getting you what you want.

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mrrotervater
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Re: spungey brakes

Postby mrrotervater » Wed Oct 27, 2010 12:22 pm

thay asked for the model number and year of the bike, but the log book only says cycle for the model, I have sent them the vehicle identification number that is SC021XBA101880 but they have not got back yet. I just hope that this is what they need. I went into Lee motor cycles cork to see if they would have the part, but they were not helpfull. I bet they thought silly old sod, I am 64 but was a biker 40 years ago and it is in the blood. Just cant wait to get this bike out on the road.

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littlebeaver
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Re: spungey brakes

Postby littlebeaver » Wed Oct 27, 2010 12:56 pm

If this was my problem, first thing I'd do is check the lines for clogs, remove and run a weed eater line thru it and that will tell you if you have any kind of clogs happening just because you get fluid thru doesn't mean you may not have a clog it's just not totally clogged yet, then I would remove the master cylinder and clean it out really well, I'd check the lines and try it first before removing the master cyclinder, you may not have to mess with it..it could be just the lines..Good luck..If you don't have weedeater line try a small flexible wire..

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mrrotervater
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Motorcycle: 1981 GL1100. Interstate

Re: spungey brakes

Postby mrrotervater » Wed Oct 27, 2010 2:20 pm

thank for the tips, i have ordered the new kit then take it from there.




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