Retrobike Forum Index

It is currently Sun Dec 04, 2016 5:17 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Damaged piston.
PostPosted: Sat Jan 21, 2012 4:46 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
Was servicing some brakes on here recently as on side ha dthe dreaded stuck piston. Tried everything to get it to return to no avail but in the process have chipped the piston. Got it out with a track pump in the end (ask if you need the tip). Just wondering to re use it or not? (Biggest chip shown).

Image


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 4:51 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
file under b 1 n.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 4:53 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
Thats what i was thinking also!

While we are here, im thinking of changing tactis. I was planning on greasing the seals rather than using brake fluid. Opinions?


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 5:00 pm 
MacRetro rider
MacRetro rider

Joined: Thu Jul 30, 2009 4:56 pm
Posts: 2471
Location: A Fifer furth o' the Kingdom
What kind of grease and why instead of brake fluid?
Seals meant to be used with brake fluid like DOT 4 don't like oil-based greases.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 5:05 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
Grease would be red bikehut stuff with teflon in (not red rubber grease).

Im betting it will be a bit more friandly to the seals so they keep sealing and dont try up so easily.
I read also that if you lubricate the seal with whatever the seal is trying to seal its going to create a film on the piston and thus not seal so well.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 5:31 pm 
MacRetro rider
MacRetro rider

Joined: Thu Jul 30, 2009 4:56 pm
Posts: 2471
Location: A Fifer furth o' the Kingdom
First of all what brakes do you have?
What fluid should they use?

Some systems use mineral oil and others use brake fluid like in a car brake system. If you use either fluid/oil in other system it will shag the seals.

Is this Halfords grease the type you'd use in wheel-bearings/BBs/headsets?


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 5:36 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
Will be trying it on juicy 7's which is dot4 i believe.

The halfords grease is multi purpose yes i assume its probably the same stuff as this:

http://www.triumph-online.co.uk/brake-assembly-red-grease-with-teflon-150ml-5379-p.asp


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 5:47 pm 
MacRetro rider
MacRetro rider

Joined: Thu Jul 30, 2009 4:56 pm
Posts: 2471
Location: A Fifer furth o' the Kingdom
From the manual Avid specify DOT 4 or 5.1 fluid and you are intending using a mineral-based grease on the seals?

"This Red Grease with Teflon is based on refined mineral oils, Lithium soap, anti-friction solid lubricants as well as corrosion and oxidation inhibitors."


Top
 Profile  
 
 Post subject: Re: Damaged piston.
PostPosted: Sat Jan 21, 2012 5:51 pm 
Retro Guru
User avatar

Joined: Tue Oct 11, 2011 11:18 pm
Posts: 733
Location: The FoD.
cyfa2809 wrote:
Was servicing some brakes on here recently as on side ha dthe dreaded stuck piston. Tried everything to get it to return to no avail but in the process have chipped the piston. Got it out with a track pump in the end (ask if you need the tip). Just wondering to re use it or not? (Biggest chip shown).

Image


That looks like a Hayes 9 piston.

Fairly cheap from chain reaction.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jan 21, 2012 6:14 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
They do look very similar yes. Havent checked diamters and stuff but the nipple bit is different on each.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 10 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