Retrobike Forum Index

It is currently Thu Dec 08, 2016 9:34 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 5 posts ] 
Author Message
PostPosted: Mon Jan 14, 2013 12:52 pm 
Retro Guru

Joined: Fri Jun 10, 2011 8:21 pm
Posts: 283
Location: London / Brighton
Wondering if you guys could help me out?

I have some old Hayes Stroker Carbon hydraulic brakes - can't remember the date I bought them but was about 2 years ago. I had them off the bike lying up coiled, for a while now, and unsurprisingly the pistons have moved out. So I took the pads out and tried pushing the pistons back in with 8mm spanner - worked fine on one brake but the other seems to have a problem..

One piston would not come out very far at all, while the other was pumped all the way out. I think that is because of some corrosion or dirt so I have tried cleaning around the edges of the protruding bit and pushing back in. Now however, I cannot push the other side back in at all to start a bleed. Even with a levering action on the side of the surrounding housing it won't go in at all and I have now succeeded in chipping the top edge of one of the ceramic pistons.

I have tried giving it some real leverage force to push it back but it will just not go. So I thought of letting some fluid out the system and opened the bleed nipple a bit but even with it open I'm having the same resistance and no oil is even coming out. Could there be an air bubble trapped because the piston overextended? Otherwise I am lost as to what to do.

I was considering taking the caliper apart and sorting it, but do I have to take all the brake fluid out of the system first - and how do I do that? There are no details for that on the Hayes instructions..

Also anyone know if yo can get replacement pad retention springs - my pads are falling out also (a classic Hayes problem apparently). I don't want to buy a whole new set..

Thanks!


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jan 14, 2013 1:52 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Thu Feb 24, 2011 1:15 am
Posts: 1887
Location: Getting fitter, I will beat the Surrey Hills....
Sounds mullered to me. As a self professed 'competent home mechanic', I would rebuild them with new pistons and seals. Here is the info you will need:

Full bleed instructional video

Full service instructions

New seals and pistons

I am sure that someone with experience with these will be along shortly to give more advice. You will need to drain the brakes before you strip them, yes. Seems the spring is hard to come by, you may want to email Hayes and see if they can send you one...? But, if you opt to rebuild them yourself, maybe get some fresh pads to have them totally like new?

Good luck!


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 15, 2013 1:26 pm 
Retro Guru

Joined: Fri Jun 10, 2011 8:21 pm
Posts: 283
Location: London / Brighton
thanks! How do I bleed all the fluid out though?

Cheers


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 15, 2013 7:25 pm 
Retro Guru
User avatar

Joined: Fri Jan 12, 2007 1:32 pm
Posts: 1953
Location: Staffordshire
That sounds like new pistons are needed...luckily if they get jammed you can break them out being ceramic.

To remove the fluid, put some tubing on the bleed nipple, open it and squeeze the lever. The fluid will be forced out through the tube and into a pit.

The other option, is to put he calliper in a pot of some sort and squeeze the lever, the pistons will then pop out, along with all of e fluid.

Replacing the pistons and rebleeding Hayes brakes is very simple. Make sure you soak the new seals in DOT fluid before installing. Luring the pistons with the fluid will make them much easier to install.

God luck!


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 15, 2013 11:25 pm 
Retro Guru

Joined: Fri Jun 10, 2011 8:21 pm
Posts: 283
Location: London / Brighton
Thanks! I now have a danm rounded allen bolt on the caliper hose connection so I can't pump out one side! Never ending problems.

Cheers


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: hamster, pipmeister, shed and 15 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group