GL1100 Rear Master Cylinder piston frozen


Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
Post Reply
OTTERCOMET
Posts: 27
Joined: Sat Jul 11, 2015 4:13 pm
Location: WHITBY ONTARIO CANADA
Motorcycle: 1982 GL1100 INTERSTATE

GL1100 Rear Master Cylinder piston frozen

Post by OTTERCOMET » Wed Apr 25, 2018 2:10 pm



Anyone had success at freeing up the piston in the rear master cylinder.
I am attempting a rebuild (got the kit) and I have the brake shaft out. Unfortunately the piston and seal did not follow (as suggested in the "how to" posted in the 1100 DIY by Wingman). Have cleaned out the portion of the cylinder that is visible with brake cleaner and have attempted to blow the piston out with 120 PSI air (nothing moved). Presently, I have the master cylinder clamped in position with that small portion of cylinder that is exposed filled with PB Blaster penetrating oil. If nothing happens I have two other thoughts - 1) apply heat to the cylinder in the hopes that slight metal expansion will free the piston 2) drill a hole in the piston, and screw in a self taping screw to provide something to pull on.
Any suggestions??



User avatar
Wilcoy02
Posts: 869
Joined: Sun Nov 21, 2010 11:37 pm
Location: Marengo, Ohio
Motorcycle: 1983 GL1100 I purchased 3/16

1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by Wilcoy02 » Wed Apr 25, 2018 5:26 pm

Use a grease gun to the caliper. The grease will push the pistons out.
Put something in between the pistons and the end of travel of piston so that both pistons push out.

DaveO430
Posts: 613
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by DaveO430 » Wed Apr 25, 2018 6:34 pm

Using a grease gun will work on the MC too, if the return hole is plugged as it usually is. A 1/4" pipe size grease fitting will screw in to the outlet hole enough to hold, don't tighten it much.

User avatar
RBGERSON
Posts: 3088
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by RBGERSON » Thu Apr 26, 2018 12:22 pm

Grease gun usually works and you might try pushing the cups in using a "C" clamp..just a little to break them free then try again pushing them out..with air/grease..back on the bike with the brake lever..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

DaveO430
Posts: 613
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by DaveO430 » Thu Apr 26, 2018 2:49 pm

RBGERSON wrote:
Thu Apr 26, 2018 12:22 pm
Grease gun usually works and you might try pushing the cups in using a "C" clamp..just a little to break them free then try again pushing them out..with air/grease..back on the bike with the brake lever..
You still don't get he's working on the master cylinder, not the calipers.

User avatar
RBGERSON
Posts: 3088
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by RBGERSON » Thu Apr 26, 2018 4:26 pm

Got it..jut focused Wilco's post my mistake.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

User avatar
Wilcoy02
Posts: 869
Joined: Sun Nov 21, 2010 11:37 pm
Location: Marengo, Ohio
Motorcycle: 1983 GL1100 I purchased 3/16

1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by Wilcoy02 » Thu Apr 26, 2018 7:01 pm

I totally missed that boat. Sorry about that. I have no idea.

User avatar
Barracuda3077
Posts: 18
Joined: Thu Jul 06, 2017 12:23 am
Location: OlympiaWA
Motorcycle: 1982 GL1100I

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by Barracuda3077 » Fri Apr 27, 2018 10:32 am

I had a hard time getting my pushrod assembly out of the rear master cylinder as well. I had to scrape a bunch of full grime and varnish out before i could see the "C" clip. It took a few light taps with a nail punch to break it free

User avatar
Barracuda3077
Posts: 18
Joined: Thu Jul 06, 2017 12:23 am
Location: OlympiaWA
Motorcycle: 1982 GL1100I

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by Barracuda3077 » Fri Apr 27, 2018 11:23 pm



Barracuda3077 wrote:
Fri Apr 27, 2018 10:32 am
I had a hard time getting my pushrod assembly out of the rear master cylinder as well. I had to scrape a bunch of full grime and varnish out before i could see the "C" clip. It took a few light taps with a nail punch to break it free

User avatar
Wilcoy02
Posts: 869
Joined: Sun Nov 21, 2010 11:37 pm
Location: Marengo, Ohio
Motorcycle: 1983 GL1100 I purchased 3/16

1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by Wilcoy02 » Fri Apr 27, 2018 11:53 pm

Glad you got it apart.

User avatar
redbug
Posts: 408
Joined: Fri Sep 30, 2011 8:22 am
Location: Broken Arrow,Ok
Motorcycle: 1983 Gl1100I
1986 Harley FLHT

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by redbug » Sat Apr 28, 2018 9:11 am

Wondering if ottercomet ever finally got his master cylinder freed up.
" Ridin on Tulsa Time "

OTTERCOMET
Posts: 27
Joined: Sat Jul 11, 2015 4:13 pm
Location: WHITBY ONTARIO CANADA
Motorcycle: 1982 GL1100 INTERSTATE

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by OTTERCOMET » Sat Apr 28, 2018 9:22 am

In response to REDBUG's question - I hope to get back at it and try the grease gun approach today - got delayed by my 12 year old pickup - it decided to have break problems and I needed to address those first - the truck runs - the bike is a project that I hope to get running in the next couple of weeks - baring any other unplanned interruptions - but thanks for inquiring. I have left the MC soaking in penetrating oil while occupied with the truck. Will definitely post my results - stay tuned for the next episode!!

OTTERCOMET
Posts: 27
Joined: Sat Jul 11, 2015 4:13 pm
Location: WHITBY ONTARIO CANADA
Motorcycle: 1982 GL1100 INTERSTATE

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by OTTERCOMET » Sat Apr 28, 2018 2:05 pm

success - the grease gun worked - I even had grease appear in both the holes where the brake fluid reservoir connects - so I know both those ports are open - working on getting all the crud cleaned out of the MC before I put the new parts in. In the kit I bought the seal that goes on the piston is not in place - from the photo in the DIY it appears that the wide end of that seal should face the threads on the piston - someone please confirm before I put it together backwards.

And again - thanks to everyone for contributing - this is a great forum for a rookie re-builder (kinda neat to be a rookie at 70+)

User avatar
WingAdmin
Site Admin
Posts: 18864
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: REAR MASTER CYLINDER PISTON FROZEN

Post by WingAdmin » Sat Apr 28, 2018 2:43 pm

OTTERCOMET wrote:
Sat Apr 28, 2018 2:05 pm
success - the grease gun worked - I even had grease appear in both the holes where the brake fluid reservoir connects - so I know both those ports are open - working on getting all the crud cleaned out of the MC before I put the new parts in. In the kit I bought the seal that goes on the piston is not in place - from the photo in the DIY it appears that the wide end of that seal should face the threads on the piston - someone please confirm before I put it together backwards.

And again - thanks to everyone for contributing - this is a great forum for a rookie re-builder (kinda neat to be a rookie at 70+)
That is correct. The wide end of the seal is closest to the "threads", the narrow end is closest to the "push" end. If you put it on backwards, you will have little to no brake pressure.

I always lube it with some brake fluid before pushing it in, to make sure it goes in easily.

Image



Post Reply