Rear master cylinder predicament


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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Rear master cylinder predicament

Postby maintainer » Sun Oct 04, 2015 1:59 pm



On my GL 1000 project bike, I am getting down to the short lists. One item was to go thru everything on the rear brakes and pedal pivot etc.
The single thing I lack doing is rebuilding the rear master cylinder, it was in just awful condition. (corrosion)
The rear master cylinder which is very similar to but not exactly like the GL1100 one on the forums video tutorial.
Problem is, evidently the piston is stuck in the bore.
I have soaked it in PB blaster, tapped on it hoping it would spring outward, shot compressed air to the back side of it.

Nothing has worked. I'm to the point of drilling into it and using an ease out bit.

Any idea's before I go all radical on it?????


1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: Rear master cylinder predicament

Postby spiralout » Sun Oct 04, 2015 2:36 pm

If the banjo fittings are the same size, take your front brake line off the splitter, bolt it to the rear master and use the front to pump it out.

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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: Rear master cylinder predicament

Postby maintainer » Sun Oct 04, 2015 3:03 pm

spiralout wrote:If the banjo fittings are the same size, take your front brake line off the splitter, bolt it to the rear master and use the front to pump it out.


Nope, rear line is a thread in line with no banjo fitting.
My fronts are all new and rebuilt but I haven't added and brake fluid or bled them out yet.
1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: Rear master cylinder predicament

Postby spiralout » Sun Oct 04, 2015 3:07 pm

Yep, I was thinking of the 1100 rear master, sorry :cry:

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ankgrays
Posts: 161
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Location: Central Iowa
Motorcycle: 1981 GL1100 interstate

Re: Rear master cylinder predicament

Postby ankgrays » Sun Oct 04, 2015 3:08 pm

I had a similar problem with my '81

Someone suggested taking out the brake bleeder and putting on a compressed air hose as tight as

you can hold it on. Then hit the air lever...popped right out.

Be careful to have the piston aimed at something soft so as to keep it from shooting across the floor.

Good Luck!!
I don't tolerate voluntary stupidity very well, and it seems to be rampant now-a-days.

"One of the problems about quotes from the internet, is that one cannot confirm their validity." - Abraham Lincoln

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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: Rear master cylinder predicament

Postby maintainer » Sun Oct 04, 2015 3:15 pm

ankgrays wrote:I had a similar problem with my '81

Someone suggested taking out the brake bleeder and putting on a compressed air hose as tight as

you can hold it on. Then hit the air lever...popped right out.

Be careful to have the piston aimed at something soft so as to keep it from shooting across the floor.

Good Luck!!


Sounds like an idea.
So just so I understand, I shouldn't look down the bore at the top of the piston and apply high pressure air to it? :P :D
1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)

User avatar
maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: Rear master cylinder predicament

Postby maintainer » Sun Oct 04, 2015 4:30 pm

Ok I went radical and got it out with no damage to the bore.
1. I carefully drilled a pilot hole in the top of the piston.
2. I followed up with a larger bit which wedged in and spun the piston, and out came all the guts.
Cleaned up the mucky nasty bore.
Ready for rebuild kit.

It's a shame a rebuild kit with a piston some rubber bits and a spring are $50. :shock:
1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: Rear master cylinder predicament

Postby spiralout » Sun Oct 04, 2015 4:35 pm

maintainer wrote:Ok I went radical and got it out with no damage to the bore.
1. I carefully drilled a pilot hole in the top of the piston.
2. I followed up with a larger bit which wedged in and spun the piston, and out came all the guts.
Cleaned up the mucky nasty bore.
Ready for rebuild kit.

It's a shame a rebuild kit with a piston some rubber bits and a spring are $50. :shock:

Agreed. I think I paid 35 bucks to vtcustoms ebay store for the rear master kit for my '80, and that was about $20 too much for what it is, in my opinion.

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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: Rear master cylinder predicament

Postby maintainer » Sun Oct 04, 2015 5:16 pm

Here's a couple of pictures of the carnage.

1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)

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redial
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Location: Kapunda, SouthAustralia
Motorcycle: 1997 GL1500 Spectre Red Aspencade

Re: Rear master cylinder predicament

Postby redial » Sun Oct 04, 2015 7:29 pm

That drill does not look too radical! But some of the other bits look somewhat sad! :shock:


Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.


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