Air in brakes


Information and questions on GL1100 Goldwings (1980-1983)
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brewman
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Motorcycle: 1982 GL1100A Aspencade

Air in brakes

Postby brewman » Fri Dec 31, 2010 1:46 pm



I just rebuilt the rear brake caliper on my 82 GL 1100A, I've pumped 32oz. of brake fluid through the system so far and I still get no brakes. The pedal does not build pressure and I get a lot of very large air bubbles coming up into the resevoir(i've pumped rear pedal for two hours)it just keeps bubbling up into resevoir.I've used a vacuum pump(mity-vac) till I got tired of pumping so I hooked up an old refrig.compressor to it.Could it be i need to rebuild the rear master cylinder? I have no leaking fluid anywhere I can see.



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WingAdmin
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Re: Air in brakes

Postby WingAdmin » Fri Dec 31, 2010 6:26 pm

If it (the master cylinder) was working before you rebuilt the caliper it should be working now.

If there is air in the system, you might just be drawing the air bubbles downward every time you pump with the mity-vac - although if you're pumping enough volume to fill the mity-vac canister within a minute or two, you should be pulling the air along with it. Did you do any work in or around the master cylinder at all?

Are you pumping with the reservoir lid removed or at least loosened enough to let air in while you pump at the caliper?

If nothing else, you might want to let it sit for an hour or two to let any bubbles migrate up toward the master cylinder and the reservoir and then try again.

Are you getting the bubbles in the reservoir only when you pump the brake pedal?

brewman
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Re: Air in brakes

Postby brewman » Fri Dec 31, 2010 9:03 pm

I only rebuilt rear caliper,the cap is off resevoir, I let it sit for two days then worked at it today some.It only produces bubbles into resevoir when the pedal is pumped with bled valve open or closed.

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WingAdmin
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Re: Air in brakes

Postby WingAdmin » Fri Dec 31, 2010 9:55 pm

Even if the caliper bleed valve is closed, and you pump the pedal, do you continue to see bubbles in the reservoir?

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keithg64
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Re: Air in brakes

Postby keithg64 » Fri Dec 31, 2010 10:15 pm

I have opened the bleeder and let gravity flow the oil through, watch the resevior and don't let it go dry. Do this a few cup fulls and should be good. Just something to try.
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brewman
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Motorcycle: 1982 GL1100A Aspencade

Re: Air in brakes

Postby brewman » Sat Jan 01, 2011 1:26 pm

WingAdmin wrote:Even if the caliper bleed valve is closed, and you pump the pedal, do you continue to see bubbles in the reservoir?

yep, bubbles come up into resevoir with valve closed and I pump the pedal.

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Re: Air in brakes

Postby WingAdmin » Sat Jan 01, 2011 3:24 pm

brewman wrote:
WingAdmin wrote:Even if the caliper bleed valve is closed, and you pump the pedal, do you continue to see bubbles in the reservoir?

yep, bubbles come up into resevoir with valve closed and I pump the pedal.


Do they continually do this, or does it taper off after a while? If it continually does this even with the bleed valve closed, then you've got a leak somewhere - the system can only hold so much air.

brewman
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Re: Air in brakes

Postby brewman » Sat Jan 01, 2011 7:34 pm

WingAdmin wrote:
brewman wrote:
WingAdmin wrote:Even if the caliper bleed valve is closed, and you pump the pedal, do you continue to see bubbles in the reservoir?

yep, bubbles come up into resevoir with valve closed and I pump the pedal.


Do they continually do this, or does it taper off after a while? If it continually does this even with the bleed valve closed, then you've got a leak somewhere - the system can only hold so much air.

The bubbles never stop or get smaller.If air is being introduced into the system then fluid should be leaking out somewhere,I don't see any leaks,no fluid on floor around or under bike

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WingAdmin
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Re: Air in brakes

Postby WingAdmin » Sat Jan 01, 2011 10:59 pm

brewman wrote:The bubbles never stop or get smaller.If air is being introduced into the system then fluid should be leaking out somewhere,I don't see any leaks,no fluid on floor around or under bike


Correct, that's what's confusing. If bubbles keep coming out, then there's either a massive store of air in there somewhere, or fluid is leaking out.

You could try forcing fresh brake fluid into the bleeder valve, up to the master cylinder (and from there into the reservoir) and see if that solves the problem. It's a technique commonly used on aircraft to bleed brake systems.

brewman
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Re: Air in brakes

Postby brewman » Wed Jan 05, 2011 8:35 pm

well I figured out what was the deal with the air in my brakes, I rebuilt the rear master cylinder and they bled out like a champ, they work good now.But as soon as I got done with that project I pulled my starter out and rebuilt it also,It's been slow to crank and stalls,I put new brushes in it and reinstalled it and I get nothing,won't crank(I think maybe the starter solenoid went bad). I hear the solenoid click but sends no power down to starter.Strange because I just had the bike running a few days earlier when I flushed the radiator fluid and it was fine. Only thing I did was rebuild master cyl. and starter now bike won't start.

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HALBUDD
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Re: Air in brakes

Postby HALBUDD » Wed Jan 05, 2011 8:52 pm

A quick check would take a volt meter put the neg. lead on neg. of battery put positive lead on wire to starter at the starter have someone try and start bike you should see 12volts or there abouts if not then yes its your relay. Assuming that your lights are still working and main fuse is blown Good luck Hal
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brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

Re: Air in brakes

Postby brewman » Thu Jan 06, 2011 9:43 pm

picked up a new starter solenoid today, installed it and works perfect.Also got a 7 volt regulator at a bike salvage yard for fuel and temp gauges and installed(that was a pain).Now my bike is all put back together and runs great,ready for winter riding! Thanks for all the help.




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