Soft rear break pedal GL1500 - Steve Saunders Goldwing Forums

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post #1 of 13 (permalink) Old 06-30-2012, 11:06 AM Thread Starter
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Hey Gang,

I seem to get quite a bit of air in my rear break pedal that can be bled out through the front caliper only, no air comes out from the rear caliper. The pedal firms up real well then about 2 months later, the air is back.

No fluid along the lines or at any connectors that I can find. Replaced the break line to SS about 3 years ago, can't remember if this started before or after the SS line replacement.

So how does air get in when this is a positive pressure system and no fluid appears to be coming out?

For the life of me, I can't figure this one out

TIA
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post #2 of 13 (permalink) Old 07-01-2012, 07:13 PM Thread Starter
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Really, nothing from this very knowledgeable and helpful group of fellow riders?

Toy4Rick

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post #3 of 13 (permalink) Old 07-01-2012, 07:33 PM
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I had a clutch like that. It was the master cylinder.

Had it rebuilt it a couple times, bled it a few times...

...finally went to the junkyard and bought a used M/C from an '86 and put it on without doing anything but bleeding. It is still working perfectly for nearly 200K miles.

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post #4 of 13 (permalink) Old 07-01-2012, 07:38 PM
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don't have any answer but give them some time everybody getting ready for nassir5
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post #5 of 13 (permalink) Old 07-01-2012, 07:38 PM
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That one is puzzling . I recently had problems with my rear pedal going soft (that don't sound right ) after changing tires and clean/lube the caliper pins. Just couldn't get the pedal to stiffen up at all. So I replaced the master cylinder with a new one and all is well again.
That's as far as my expertise goes. Can't explain why it stopped working.

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post #6 of 13 (permalink) Old 07-01-2012, 09:03 PM Thread Starter
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MC seems an unlikely suspect since I never get any air out of the rear caliper, only the front.

I have bled this about 4-5 times, is it possible that I just haven't gotten all the air out yet?

I have speed bleeders on each caliper, let me ask this, should they be fully opened or partially opened to get the best bleed?

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post #7 of 13 (permalink) Old 07-01-2012, 09:19 PM
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Well, I gave it my best shot.

Why ain't we ridin'?
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post #8 of 13 (permalink) Old 07-01-2012, 09:28 PM
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Speed Bleeder instructions say open 1/8 - 1/4 turn.
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post #9 of 13 (permalink) Old 07-01-2012, 10:00 PM
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Rick
The SS line, is that from the master to the rear caliper? Or still the steel line off master cyl?
Have you had a leaking battery? If so chevk the line out of the master cyl.

Stu
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post #10 of 13 (permalink) Old 07-01-2012, 10:13 PM
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A couple of possibilities come to mind. First would be a master cylinder problem. A defective master piston cup could suck air into the system when releasing the pedal. If this was coupled with a plugged small port air could build up in the system. If it were my bike I'd check the small port in the master cylinder first and check that there's no sign of any fluid leak around the area where the piston rod comes out of the master cylinder. One other lesser possibility is that some people have had problems with speed bleeders in that they can suck air back into the sytem around the threads.

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