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Help with Suntour Hidden Spring Brake

Old 04-22-14, 02:21 PM
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Help with Suntour Hidden Spring Brake

I have been working on an old centurion road bike. The Suntour GPX hidden-spring brakes were not returning well so I took apart the front brake. Now for the life of me I cannot get it back together with the springs. Does anyone have any guidance?
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Old 04-22-14, 03:08 PM
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Originally Posted by mathpants
I have been working on an old centurion road bike. The Suntour GPX hidden-spring brakes were not returning well so I took apart the front brake. Now for the life of me I cannot get it back together with the springs. Does anyone have any guidance?
Having done this job decades ago with a similar design Superbe Pro brake, my advice is going to be too late for you. Don't take these apart.

Yes, I got it working again, but sorry, it's been too long to remember what the trick was.
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Old 04-22-14, 03:32 PM
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Originally Posted by FBinNY
Having done this job decades ago with a similar design Superbe Pro brake, my advice is going to be too late for you. Don't take these apart.

Yes, I got it working again, but sorry, it's been too long to remember what the trick was.


Thank you, I managed to get it after struggling more. I wont take one of them apart again for sure. I would suggest that anyone who reads this leave them together as well.
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Old 04-22-14, 04:23 PM
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Originally Posted by mathpants
I would suggest that anyone who reads this leave them together as well.
Unless they like a challenge
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Old 04-22-14, 05:35 PM
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i had the same problem with a rubic's cube.
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Old 04-22-14, 09:32 PM
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My coworker took on a SRAM 11 speed RH shift pod problem yesterday. He opted to take it apart, as in levers off the shafts and more. He wished he had a couple of extra hands the size of a barbie doll's.

Being older then he is I saw the likely outcome last night. This morning he was still trying to reassemble the shift pod. Sometimes a man has to know his limitations. Andy.
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Old 04-24-14, 11:44 AM
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Originally Posted by Andrew R Stewart
This morning he was still trying to reassemble the shift pod. Sometimes a man has to know his limitations. Andy.
Stuff like that is mostly a matter of how much patience and persistence you can bring to bear... sometimes you have to wait for inspiration to strike, other times you just give it another crack and somehow pull it off without quite knowing why.
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Old 08-13-16, 04:28 PM
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Hello, mistakenly (is that a word?) to my front Superbe pro brake caliper apart and came across this old thread. Can you give me any tips on getting that spring back in? Thanks
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Old 08-14-16, 07:53 AM
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Try posting in C & V as those guys often have original diagrams/instructions.

https://www.tearsforgears.com/2008/12...dia-compe.html

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Old 06-15-17, 06:59 AM
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Late to this thread, but...

The front Suntour GPX brake on my 1989 Centurion Ironman Expert was misaligned slightly. The right caliper rubbed against the rim slightly even with the quick release opened. I didn't want to attempt to disassemble it to adjust the internal spring after reading threads like this one.

I noticed while moving the cables around on the handlebar to install mounts for my video camera and phone the front brake calipers would move. Since the brake was position sensitive to the cable I just zip tied the cable to the handlebar after tugging it to a more vertical position to minimize any curve.

Problem solved. Inelegant but effective.
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Old 06-19-17, 09:00 AM
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Suntour Superbe internal spring installation

Since I haven't figured out how to get alerts about certain topics, I thought I would share how I finally got my Suntour brake caliper with the hidden spring back together. It was not by divine inspiration on my part, just a great suggestion from another forum member. I wrapped the inside brake arm then placed it in a vice. I made sure that one of the spring ends was in the anchor hole of the arm being held in place by the vice. I then installed the other brake arm, tightening it so that the opposite spring end was rubbing against the inside of the arm. I then twisted the free brake arm so that the spring end and the anchor hole would line up and snap into place. You really have to twist it quite a bit. After it snapped into place, I then tightened down the brake arm to the appropriate tension (not overly tight). Hope this helps others. Just message me if there are any questions.

Last edited by cirp; 06-19-17 at 09:04 AM.
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