'83 Bleeding Brakes = no piston pressure


Information and questions on GL1100 Goldwings (1980-1983)
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dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

'83 Bleeding Brakes = no piston pressure

Postby dvcruz » Thu Oct 14, 2010 5:14 pm



Hi to all. I just finished rebuilding the brake sys on an '83 that sat for 15 years. I rebuilt the rear master cylinder, front and rear brake calipers. I blead the left front brake no problem. The right front and rear brake are part of a linked system and I cannot bleed them. I know I have to start with the front and then the rear.
My main problem is that I can't seem to get any pressure to either brake. I can get fluid to the front and rear calipers (my driveway has all the spots to prove it) and I've blead all the air bubbles out of both. But I can't seem to generate enough pressure to work the pistons. Could it be the proportioning valve (which I cleaned out, along with all hoses).
I'm stumped. Appreciate any help.
Thanks.
D


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goldtr6c
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Motorcycle: 1985 GL1200 LTD
1982 GL1100 STD
1976 GL1000 "800lb Canary"

Re: '83 Bleeding Brakes = no piston pressure

Postby goldtr6c » Thu Oct 14, 2010 6:35 pm

Getting rid of that air where the hose bolts to the master cylinder is a pain sometimes. I unbolt the hose and hold it between two fingers then pump. Lift a finger now and then to let out air then squeeze and wait a few seconds for the fluid to draw up to thr fingers. Helps here to have a helper doing the pumping while you squeeze. That way they can also keep an eye on the resevoire when you start making progress.

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luckychucky60
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Location: Poplar Bluff MO
Motorcycle: 1982 GL1100

Re: '83 Bleeding Brakes = no piston pressure

Postby luckychucky60 » Thu Oct 14, 2010 7:35 pm

Local mechanic told me today about the rubber hoses get old and start expanding under pressure. This may not be the cause of your lack of pressure. I'm sure the bulge isn't visible, but the worn out hose is old and weak. The mechanic said they don't make them anymore. I'd think about aftermarket dual pistons, maybe three or four piston calibers. Maybe Performance Machine or some other caliber maker manufacture something that might work?
As long as I have my health then everything will be ok

dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

Re: '83 Bleeding Brakes = no piston pressure

Postby dvcruz » Thu Oct 14, 2010 8:16 pm

Tried bleeding from the main brake line bolt with no change. I hear what being said about the hoses, but the left side works fine and it's the same age (I know, flawed reasoning). I would think that even if both hoses were too old, I might get at least a token amount of caliper piston movement, but nothing. I have the calipers hanging on the bike now (so that they aren't trying to grab the rotor, and absolutely no movement.
Question about the master cylinder push rod. It has an adjustable clevis, but I haven't found anything in print about what\when\how it should be adjusted. Mechanically, changing the lenght will change the piston stroke inside and maybe that has a pressure effect - could that be the problem? I'm gonna try and see what happens.
Thanks for the help.
Back in the San Diego area!

dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

Re: '83 Bleeding Brakes = no piston pressure

Postby dvcruz » Thu Oct 14, 2010 9:29 pm

Actually, I've been thinking about changing the hoses anyway. Anyone out there have any experiance with getting metal brake lines for thier gl1100's brakes? Cost-dealers-performance?
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WingAdmin
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Re: '83 Bleeding Brakes = no piston pressure

Postby WingAdmin » Fri Oct 15, 2010 8:00 am

I put stainless braided brake lines on my 1100, and it was the single best upgrade I have made to my bike. It makes a HUGE difference in brake feel and power.

I got mine from Venco Wings - and while they're probably one of the highest quality, they're also one of the most expensive. You can find them cheaper - but they won't be made quite as well.

dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

Re: '83 Bleeding Brakes = no piston pressure

Postby dvcruz » Fri Oct 15, 2010 3:01 pm

Ha, ha, figured it out. Anyone interested in the answer to my problem?? Just kidding, of course you are.
I mentioned earlier that I had rebuilt the rear brake master cylinder. I had purchased a set of springs, rubber seals and piston(?) and installed them. Well I took apart the cylinder and compared the parts to a set of old parts and they are not the same. They look identical if you hold the about two feet apart. But side by side, the new parts are actually just a tad smaller. Let say, maybe 5-10 percent smaller. Of course, with the smalle diameter, the rubber seals weren't making full contact against the cylinder walls, hench no pressure. Put the old parts back in and after 10 minutes of brake bleeding everything works fine now.
Now to contact the company that sold me the parts...
Thanks everyone for the help.
Dennis
Back in the San Diego area!

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WingAdmin
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Re: '83 Bleeding Brakes = no piston pressure

Postby WingAdmin » Fri Oct 15, 2010 3:46 pm

That will definitely do it! Where did that kit come from?

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luckychucky60
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Re: '83 Bleeding Brakes = no piston pressure

Postby luckychucky60 » Fri Oct 15, 2010 4:08 pm

Thanks to wing admin's suggestion I just spent the obligatory 221 plus shipping for the brake lines. Hope that helps. I really don't like the plastic reservoir crusty and brittle looking. You know a source for a shiny new reservoir? Sorry, didn't mean to hi-jack your post. I'm glad it's working for you now, yea contact the parts guy. Be nice.
As long as I have my health then everything will be ok

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WingAdmin
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Re: '83 Bleeding Brakes = no piston pressure

Postby WingAdmin » Fri Oct 15, 2010 4:37 pm

You can get nice new reservoirs at a pretty good price from the old standby, partsnmore.com.

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luckychucky60
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Re: '83 Bleeding Brakes = no piston pressure

Postby luckychucky60 » Fri Oct 15, 2010 8:05 pm

Thanks Wing Admin! Anyone make chrome ones? Seems crazy to replace with plastic again. Thanks for the link.
As long as I have my health then everything will be ok

dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

Re: '83 Bleeding Brakes = no piston pressure

Postby dvcruz » Fri Oct 15, 2010 10:14 pm

The parts came from tasclassicmotorsports. I sent them an email to get there take on this. I'll let everyone know what happens next.
DVC
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WingAdmin
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Re: '83 Bleeding Brakes = no piston pressure

Postby WingAdmin » Mon Oct 18, 2010 10:38 am

I know there was a guy on eBay that was selling chrome one-piece master cylinder/reservoirs for the 1100 for a bit. I don't know if he's still around or not.

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MSGT-R
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Re: '83 Bleeding Brakes = no piston pressure

Postby MSGT-R » Mon Oct 18, 2010 1:17 pm

Get the front master upgrade from Randakk, you wont regret it!!!


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