Front brakes build pressure but won’t release


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anthony_riester
Posts: 3
Joined: Fri Nov 27, 2009 12:17 pm
Location: Wabasha, MN
Motorcycle: 1976 Honda Gold Wing

Front brakes build pressure but won’t release

Post by anthony_riester » Sat May 05, 2018 11:49 pm



Hey all having trouble with my front brakes, they pump up after having the calipers off and manually pushing the pistons back in but once pumped up will not release. Tried cracking the bleeders and fluid does come out but the brakes stay tight on the rotors, I did find some washers between the front forks and the calipers should those be there? Anyway from reading up on what has been said before collapsed brake lines or the small hole in the master cylinder? Should I go after any of those or am I missing something? Any help would be greatly appreciated, thanks



DaveO430
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Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: Front brakes build pressure but won’t release

Post by DaveO430 » Sun May 06, 2018 5:43 am

If you open the bleeders and they don't release the only possibility is the pistons sticking. It can't be the lines or the MC, you proved that by opening the bleeders.

anthony_riester
Posts: 3
Joined: Fri Nov 27, 2009 12:17 pm
Location: Wabasha, MN
Motorcycle: 1976 Honda Gold Wing

Re: Front brakes build pressure but won’t release

Post by anthony_riester » Sun May 06, 2018 12:35 pm

Sounds good to be I’ll head in that direction, thanks for the support I’m fairly green when it comes to brakes and just didn’t want to take a bunch of things apart for no reason.
Thanks!

phoenixtubs
Posts: 41
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Front brakes build pressure but won’t release

Post by phoenixtubs » Sun May 06, 2018 12:49 pm

I just rebuilt front and rear calipers, front master cylinder, and in the process of rebuilding rear master cylinder on my 78 GL1000. I bought the kits at Parts N More, I did not think it was too difficult. Lots of stuff on the forums about this, which I took full advantage of. ;) We stand on the shoulders of those who went before us!

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SnoBrdr
Posts: 614
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: Front brakes build pressure but won’t release

Post by SnoBrdr » Sun May 06, 2018 5:23 pm

anthony_riester wrote:
Sun May 06, 2018 12:35 pm
Sounds good to be I’ll head in that direction, thanks for the support I’m fairly green when it comes to brakes and just didn’t want to take a bunch of things apart for no reason.
Thanks!
Plenty of videos on how to rebuild the GLs brakes.

bobnberty
Posts: 1
Joined: Mon Sep 13, 2010 10:43 am
Location: United Kingdom
Motorcycle: honda gl1000 1976

Re: Front brakes build pressure but won’t release

Post by bobnberty » Sun Jun 03, 2018 3:02 pm

I had that problem on my 76 it was due to new brake pipes being fitted with to small a bores so pressure could my return correctly
Hope this helps

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Fred Camper
Posts: 1310
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Front brakes build pressure but won’t release

Post by Fred Camper » Sun Jun 24, 2018 8:14 pm

Just be sure that they are not releasing. This is not something you can see. The designed runout in the rotors is what pushes the pistons back. So you need the bike free to roll or perhaps the wheel off the ground to force a couple full rotations to know if the pistons return. Roiling is the best way to know.

kndw
Posts: 88
Joined: Sat Jun 19, 2010 2:56 am
Location: Driebergen, Utrecht
Motorcycle: 1976 GL1000 Plempbak

Re: Front brakes build pressure but won’t release

Post by kndw » Wed Jun 27, 2018 2:30 pm

Regarding the washers: the cmsnl.com website has parts lists with exploded views that show what is supposed to go where:

https://www.cmsnl.com/honda-gl1000-gold ... zPl1MvRZ-E

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

Re: Front brakes build pressure but won’t release

Post by DaveO430 » Wed Jun 27, 2018 4:05 pm

Fred Camper wrote:
Sun Jun 24, 2018 8:14 pm
The designed runout in the rotors is what pushes the pistons back.
That is simply not true. It is the seal that moves the piston back.

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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Front brakes build pressure but won’t release

Post by virgilmobile » Thu Jun 28, 2018 2:20 pm

Some of my bikes had sticking calipers...
I resolved all of these by a few things.
Remove the piston...clean it.Remove any crud buildup..I use 2000 grit paper gently till they shine.
Clean the caliper boar the same way with the "O" ring removed.
Using a hook tool..carefully clean the junk in the bottom of the "O" ring seat...
Test fit the piston into the caliper.It should slide all the way to the bottom easily and back out.
Install the "O" ring..
Coat the "O" ring with brake fluid as well at the piston.
You should be able to push the piston to the bottom with 2 thumbs...nice and smooth.
My binding was from lack of flushing the system and moisture oxidized the aluminum building a layer under the "O" ring and around some of the piston.
Keep everything clean.

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virgilmobile
Posts: 8493
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Front brakes build pressure but won’t release

Post by virgilmobile » Thu Jun 28, 2018 2:23 pm

Oh yeah...the master cylinder does have a bleeder hole that does get plugged up too.
Suspect this if your calipers release when you crack the bleeder port.

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DWade1990
Posts: 68
Joined: Thu Apr 27, 2017 7:27 pm
Location: Akron, OH
Motorcycle: 1976 GL1000
1983 GL1100 Aspencade
1981 CB750K
2006 FJR1300

Re: Front brakes build pressure but won’t release

Post by DWade1990 » Thu Jun 28, 2018 8:34 pm

My money is on the bleeder hole in the master cylinder. I actually went down on my 83 because of this. I got about a mile down the road the first time I rode it, noticed it was down on power and that the brakes were smoking. When I went to turn around, the front wheel locked up and the bike lowsided. Thankfully I was only going about 25 mph when it happened.

Lots of great advice here. VirgilMobile is on the money with his recommendations. If they're releasing when you crack the bleeder, it's either a collapsed hose or a plugged return port in the master. Sounds like a brake overhaul is in your future. None of the work is very difficult, just pay attention to what you're doing. The only hard part is getting that circlip out of the master cylinder if you don't have a good set of circlip pliers, but it can be done with a pair of picks and some patience.

Don't ride the bike with sticking calipers. Trust me.



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