Save me from my locked brakes disaster


Information and questions on GL1200 Goldwings (1984-1987)
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gof
Posts: 116
Joined: Wed Jun 06, 2012 9:39 am
Location: Crown Point, Indiana
Motorcycle: 2004 Titanium Gl1800 & 1984 Gold Wing Aspencade 1200

Save me from my locked brakes disaster

Postby gof » Sat Jun 16, 2012 6:18 pm



1984 GW Aspencade 1200 - just removed from long term storage.

I got the Mityvac as recommended (which leaks air) and I never got even close to a full tube while bleeding. I did get a full canister and "some" rear brake pedal. Just enough pedal to lock the front and back brakes.

I am at my wits end with this thing. Anyone close to the south burbs of Chicago or Nw Indiana who knows how to fix this?

Anyone want to buy this bike who knows how to fix brakes?



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seabee_
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1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 6:45 pm

Sounds like you will have to remove the rear master cylinder and clean out the bleed back return hole. It gets clogged from old fluid and will cause the brakes to lock. When the brakes are locked up, crack open the bleeder on the rear caliper or the linked right front caliper and see if it releases the locked brakes. That will indicate a blocked bleed back hole in the brake MC.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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gof
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Re: Save me from my locked brakes disaster

Postby gof » Sat Jun 16, 2012 6:49 pm

seabee_ wrote:Sounds like you will have to remove the rear master cylinder and clean out the bleed back return hole. It gets clogged from old fluid and will cause the brakes to lock. When the brakes are locked up, crack open the bleeder on the rear caliper or the linked right front caliper and see if it releases the locked brakes. That will indicate a blocked bleed back hole in the brake MC.



Right side front as if I was sitting on the bike?

Just cracking both bleed valves will release the pistons?

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gof
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Re: Save me from my locked brakes disaster

Postby gof » Sat Jun 16, 2012 9:25 pm

seabee_ wrote:Sounds like you will have to remove the rear master cylinder and clean out the bleed back return hole. It gets clogged from old fluid and will cause the brakes to lock. When the brakes are locked up, crack open the bleeder on the rear caliper or the linked right front caliper and see if it releases the locked brakes. That will indicate a blocked bleed back hole in the brake MC.
cracked right front bleeder and rear, brakes still locked. Trying to get master cylinder off but it has crusted connections in hard lines on top of master cylinder, wont budge. Whats the best way to unlock the brakes now?

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seabee_
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1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 9:31 pm

Yes, as sitting on bike, right front and rear brakes operate off the pedal. Left front from the lever. What happens is the tiny pressure bleed back port in the M/C gets clogged and causes the brakes to lock up. If this happens and you crack open the bleeder on either front or back linked brake and the wheel spins freely then the port is clogged. When I get off work I will post some links for you to read to better understand brake rebuilding. Check the how to links at the top of the forum page.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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seabee_
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1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 9:33 pm

You might need to pull the calipers to clean and possibly rebuild them. Like I mentioned, I'll post some links for you. It could be the caliper slide pins are stuck. Do the calipers move at all?
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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gof
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Re: Save me from my locked brakes disaster

Postby gof » Sat Jun 16, 2012 9:43 pm

seabee_ wrote:You might need to pull the calipers to clean and possibly rebuild them. Like I mentioned, I'll post some links for you. It could be the caliper slide pins are stuck. Do the calipers move at all?

I had already pulled and cleaned the rear, but I did not remove and polish the pistons. I did order a rebuild kit on the rear. I lubed the Pad pins and mount bolts, it all seemed good going on. Clearly something is not right. I have read the links here. My newest issue is getting hard lines off the top of the master cylinder without rounding the bolts. What a horrible design and placement.

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seabee_
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1977 Kawasaki kz400
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1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 10:20 pm

Most people have bought a flare nut wrench with a flex head to get to the hard lines to loosen them. Others have removed the battery box to get better access to the lines. Spray them down with lots of PB Blaster. Try not to use a regular wrench or you'll round them out.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 10:21 pm

You definitely want to remove the pistons and clean them up. They can get dirty enough to cause the locking brakes. Check the seals also.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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gof
Posts: 116
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Location: Crown Point, Indiana
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Re: Save me from my locked brakes disaster

Postby gof » Sat Jun 16, 2012 10:44 pm

seabee_ wrote:Most people have bought a flare nut wrench with a flex head to get to the hard lines to loosen them. Others have removed the battery box to get better access to the lines. Spray them down with lots of PB Blaster. Try not to use a regular wrench or you'll round them out.

- Already hit them with PB - I will hit it with more and get flare nut wrenches. I wish I knew if the master cylinder actually needed to be rebuilt or not.

Ordering a rebuild kit off of Ebay now - says its for an 84 1200 Apsencade - I hope so.

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seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
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Motorcycle: 1985 Honda Goldwing GL1200
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1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sat Jun 16, 2012 11:35 pm

If you have the kit wouldn't hurt to rebuild the m/c. The common problem is the return port clogging. Use small gauge wire to clean out the hole real good. Most people just blow it out with air only to find out they have to pull it out again to clean it with wire.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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gof
Posts: 116
Joined: Wed Jun 06, 2012 9:39 am
Location: Crown Point, Indiana
Motorcycle: 2004 Titanium Gl1800 & 1984 Gold Wing Aspencade 1200

Re: Save me from my locked brakes disaster

Postby gof » Sun Jun 17, 2012 2:25 pm

seabee_ wrote:If you have the kit wouldn't hurt to rebuild the m/c. The common problem is the return port clogging. Use small gauge wire to clean out the hole real good. Most people just blow it out with air only to find out they have to pull it out again to clean it with wire.


I used the grease gun method to push the pistons out. One piston did not want to come out. Both pistons are very very clean. Virtually no corrosion or anything where it counts. So why would one piston not move out from the grease gun?

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seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
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1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Save me from my locked brakes disaster

Postby seabee_ » Sun Jun 17, 2012 2:41 pm

Remove the seal in the housing and try fitting the pistons into the caliper. Lube them with a little brake fluid. They should go in and out fairly easy. Look in the groove where the seal sits for any rust/corrosion. That would push the seal out causing a tight fit. Maybe some fine grit Sandpaper to polish the piston will help. If one piston was stuck, that may have been the problem. Clean out the groove before replacing the square piston seals. When putting everything back together use brake fluid to lube everything up. Don't use any petroleum based oil. That will cause the rubber pieces to swell.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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firstwing
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Re: Save me from my locked brakes disaster

Postby firstwing » Sun Sep 09, 2012 12:36 pm

If you compress the pistons into the caliper for clearance of the new pads without polishing them up and there's gunk on them, they will no doubt stick. As the pads wear, the piston does not return as far as they did with new pads. They collect dirt and grime. I went through this with new pads and had to replace a rear disc. Also, the return orifice in the master cylinders as mentioned earlier is very important to inspect and clean as well. Good luck.




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