100% Biker & Trike Magazine Forums

Go Back   100% Biker & Trike Magazine Forums > 100% Biker > The Workshop

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 10-03-2017, 02:33 PM
Tricky-Dicky Tricky-Dicky is offline
Chat Pimp
 
Join Date: Dec 2016
Location: Norfolk
Posts: 167
Default Brake & clutch master cylinder HELP!!

Really struggling here, bought some ebay brake and clutch master cylinders, and found that they where not man enough IE piston size to brake caliper/pistons ratio was not right, master cylinder does not shift enough fluid volume, so brake does not engage until the leaver is nearly touching the handlebar, same goes for the clutch.

They where 17mmm pistons, so i tried an old leaking generic M/C with a 5/8" piston and this worked fine for both clutch and brake, but my problem is now where to find brake & clutch M/C with 5/8" or 19mm pistons?
cant seem to find any on ebay,
I have seen some radial M/C with 19x18+16x18 pistons on AliExspress but i have no experience or idea just how this would translate to a normal M/C as the piston stroke is never mentioned.

So if anyone can enlighten me, or tell me of any existing M/C off a current bike with 5/8" or 19mm pistons that i can pick up from a breaker (don't want to spend silly money) i would be very grateful.
Reply With Quote
  #2  
Old 10-03-2017, 06:53 PM
harry's Avatar
harry harry is offline
Techno Guru! He's Good! He Knows Everyfink!
 
Join Date: May 2005
Location: Taunton
Posts: 3,399
Default

A friend of mine had the same problem recently. He ended up getting an engineering firm to machine the bores of the MC to accept 19mm pistons and using a repair kit.

I haven't checked his figures but he reckoned it was cheaper than buying the correct cylinders.
__________________
si is does non opportunus vos postulo a maior pango
Reply With Quote
  #3  
Old 10-03-2017, 08:12 PM
Tricky-Dicky Tricky-Dicky is offline
Chat Pimp
 
Join Date: Dec 2016
Location: Norfolk
Posts: 167
Default

That's a good point, if the M/C has enough meat, but taking it out by 1mm shouldn't be a problem, i guess if i can find a decent expanding reamer, i could do it myself, i presume the repair kits are pretty generic?
Reply With Quote
  #4  
Old 10-03-2017, 08:22 PM
Tricky-Dicky Tricky-Dicky is offline
Chat Pimp
 
Join Date: Dec 2016
Location: Norfolk
Posts: 167
Default

Actually scrub that, just been on ebay and they seem to be specific, which is fine if you have the original M/C rather than a generic Chinese one, and looking at the prices, it will probably end up a similar price to buying a pair of large piston radial M/Cs.

Still could do with some insight into the radial ratios if anyone knows?
Reply With Quote
  #5  
Old 14-03-2017, 08:58 AM
Tricky-Dicky Tricky-Dicky is offline
Chat Pimp
 
Join Date: Dec 2016
Location: Norfolk
Posts: 167
Default

Ended up ordering yet another set of M/Cs from AilExpress, this time 19mm radial, will look a little ungainly on a bobber but should do the job.
Reply With Quote
  #6  
Old 22-03-2017, 08:48 AM
Tricky-Dicky Tricky-Dicky is offline
Chat Pimp
 
Join Date: Dec 2016
Location: Norfolk
Posts: 167
Default

The M/C arrived yesterday, pretty quick from China........however waits for the i told you so's!
Anyway the brake side bleed nipple dose not seal, had to cut down a bolt to use it, and now the leaver pivot pin is starting to come out, but thy work OK, just disappointing that the quality is not great, neither is a problem as i can just sleeve the pin and use a bolt through which is the way they should have been made.

I will be sending pics to the supplier and hope for a refund or replacement.
Reply With Quote
  #7  
Old 23-03-2017, 06:56 AM
Friar Tuck's Avatar
Friar Tuck Friar Tuck is offline
Super Moderator
 
Join Date: Apr 2004
Location: Brothertoft, Lincolngrad!
Posts: 11,177
Default

Quote:
Originally Posted by Tricky-Dicky View Post

.......I will be sending pics to the supplier and hope for a refund or replacement.

Don't hold your breath!.....
__________________
Does my belly look big in this?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 03:46 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.