Rieju & GasGas Legacy Riders Club Forum  

Go Back   Rieju & GasGas Legacy Riders Club Forum > GasGas Enduro Technical Forums > Enduro Chassis & Body

Enduro Chassis & Body Enduro Frame, Plastic, Brakes, Bars, Controls, wheels, tires, sprockets & gearing.


Reply
 
Thread Tools Display Modes
  #1  
Old 08-29-2017, 10:19 PM
Aggie Aggie is offline
Member
 
Join Date: Aug 2017
Posts: 16
Default 2012 EC300R Rear Brake Problem

I've been having a problem with my rear brakes for about two weeks now and it's frustrating me to no end. Hopefully someone here can help me out. My rear brake piston wont return after being pushed out, causing the rear brakes to drag. I've rebuilt the MC, checked the brake line, and checked the caliper seals.
I've narrowed it down to something in the MC. It's not the brake line, since I can push in the rear piston with just the MC detached. The only thing I can think I may have done wrong is put in one of the MC piston seals backwards (both are cupping in the direction of compression), I figured the one on the bottom is a secondary seal and would cup in the same direction as the first. Any help would be greatly appreciated.


Reply With Quote


  #2  
Old 08-30-2017, 05:02 AM
VilluEST VilluEST is offline
Member
 
Join Date: Oct 2015
Location: Estonia
Posts: 53
Default

Do I understand correctly that if the master cylinder is attached you can't push the piston back in? It goes in only when master cylinder is detached? If so, then probably it can be the seal as you noted. Did you also take the rear piston out and clean it and also the piston seal? They get really dirty and even if you can push the piston back in, the brakes would still heat up.
Reply With Quote
  #3  
Old 08-30-2017, 08:12 AM
Aggie Aggie is offline
Member
 
Join Date: Aug 2017
Posts: 16
Default

Yes, you are correct. I'll try to swap the direction of one of the seals to see if that's the problem later on. I did clean the piston and it's seal, still no luck though. The only other thing could be that the port to the MC reservoir is blocked. Most brakes have two of such holes, but this one seems to only have one, or is it at the bottom of the reservoir?
Reply With Quote
  #4  
Old 08-30-2017, 10:55 PM
Aggie Aggie is offline
Member
 
Join Date: Aug 2017
Posts: 16
Default

Well, I finally figured it out. It turns out the cupped washer (not sure of the technical term) that goes above the circlip on the MC was in the wrong direction. The correct direction would be for the cup to bulge away from the piston, not towards. It seems it cupping towards the piston positions the piston such that it blocks the hole between the cylinder and reservoir (forgot the technical term...)
Reply With Quote
  #5  
Old 08-31-2017, 08:05 PM
(F5)'s Avatar
(F5) (F5) is offline
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 2,063
Default

Cameras on phones are great things now they work properly and storage is infinite ish.

Click as you take apart.
__________________
'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
Reply With Quote
  #6  
Old 08-31-2017, 10:51 PM
Aggie Aggie is offline
Member
 
Join Date: Aug 2017
Posts: 16
Default

I agree, but I bought it that way. I sure wish the parts diagram had piston shown, may have saved me some headache.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
2012 EC300R Rear Brake Aggie Enduro Chassis & Body 0 08-26-2017 09:21 PM
2012 rear brake Cox76y Enduro Chassis & Body 4 06-19-2017 07:52 AM
Rear Brake Problem StuJohnson Enduro Chassis & Body 15 02-01-2013 12:03 PM
2012 ec300 brake problem. nato Enduro Chassis & Body 11 04-28-2012 12:15 AM
Rear Brake Problem nsgasser Enduro Chassis & Body 0 06-03-2008 11:16 AM




All times are GMT -5. The time now is 10:29 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org