Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
XT600 3AJ Rear Master Cylinder Alternatives XT600 3AJ Rear Master Cylinder Alternatives
Register FAQ Calendar Today's Posts
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Brad-Houghton, of Parque Nacional Eduardo Avaroa, Bolivia

Destination ANYWHERE...
Adventure EVERYWHERE!


Photo by Brad-Houghton,
The Stone Tree,
Reserva Nacional de
Fauna Andina Eduardo Avaroa
(Eduardo Avaroa Andean Fauna
National Reserve)
Bolivia



Like Tree1Likes
  • 1 Post By Jimmy The Web

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 21 Jul 2020
Registered Users
New on the HUBB
  
Join Date: Jul 2020
Posts: 3
XT600 3AJ Rear Master Cylinder Alternatives
Hi, does anyone know if there alternatives from newer bikes for XT600 3AJ master cylinder.
Planning trip in a week's time and have rear brake problems. Wondering if cylinder bore is worn.
Reply With Quote
  #2  
Old 21 Jul 2020
Grant Johnson's Avatar
HU Founder
Veteran HUBBer
  
Join Date: Dec 1997
Location: BC Canada
Posts: 7,348
What's the exact problem, and have you tried changing fluid and careful bleed?
__________________
Grant Johnson
Seek, and ye shall find.
------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
Reply With Quote
  #3  
Old 21 Jul 2020
R.I.P. 25 November 2021
Veteran HUBBer
  
Join Date: Feb 2010
Posts: 688
Quote:
Originally Posted by Jimmy The Web View Post
Wondering if cylinder bore is worn.
Nope wont be worn, possible new seal on the piston but its not leaking correct? so its not your master cylinder.

Service your caliper (sticking/tight piston?) fresh fluid & bleed it properly.

Mezo.
Reply With Quote
  #4  
Old 21 Jul 2020
Registered Users
New on the HUBB
  
Join Date: Jul 2020
Posts: 3
Hi Grant, Mezo

Fitted new seals to caliper and master cylinder. Bled the brakes (normal method) but very long travel on brake pedal, and just slows down bike a little.

Next thought was to to bleed brakes by reverse method (very small syringe hopeless), and was going to put two thin pieces of plastic between brake pads and pump them together, then fill through nipple. However, I could not pump the brake pads together fully.

Prised them apart and (in order to check the seals were fitted properly) tried to pump piston out, but piston now stuck most of way out (and I cant force it back in). I will take off the dust seal and then try again with a newly filled system.

Maybe seals restricting piston movement?

Massive syringe arrives today which should make reverse bleeding easier and cleaner.

I hope that you are both correct, and it is just air in the system.

My thoughts about the bore in the master cylinder being worn was that, with the new seals on, the piston fitted very easily into the bore. How does it manage to generate the force with such an easy fit?

Anyhow, going away with my 2 sons in a weeks time....Got to fix it.

Thanks for your help.
Reply With Quote
  #5  
Old 21 Jul 2020
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 622
m/c seals are very soft, they start sealing as soon as there is minimal pressure behind.



most likely there are still bubbles in there.
Reply With Quote
  #6  
Old 25 Jul 2020
Registered Users
New on the HUBB
  
Join Date: Jul 2020
Posts: 3
Never would have thought this was the problem!
I finally sorted out the poor rear braking. It wasn't the hydraulics. I stripped the caliper twice, checking seals and piston and reverse bled. I was confident there was no air in the system.

It turned out to be the brake pedal. The mounting hole was worn. Oval rather than round. This was causing excessive play in the whole assembly. So when pushing the pedal it was moving sideways, as well as down. This meant less effective movement on the piston. Only a few mm, but enough to make a significant difference.

Shimming the pedal to remove sideways movement sorted the problem.
Reply With Quote
  #7  
Old 25 Jul 2020
R.I.P. 25 November 2021
Veteran HUBBer
  
Join Date: Feb 2010
Posts: 688
Glad you got it sorted & good of you to give us the feedback it all helps for future diagnosis.

Mezo.
Reply With Quote
Reply

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 

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
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
XT600 Rear Suspension 1600 Yamaha Tech 107 6 Oct 2019 16:38
Rear master rcylinder xt 600 gwel Yamaha Tech 1 1 Sep 2017 19:33
xt600 55W front master cylinder Dolpheus Yamaha Tech 4 17 Mar 2012 01:06
XT600 3AJ seat and rear plastic cover for sale goodwoodweirdo Yamaha Tech 0 2 Mar 2012 14:00

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now, and add your information if we didn't find you.

Next HU Eventscalendar

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27
Queensland is back! May 2-5
Germany Summer: May 29-June 1
Ecuador June 13-15
Bulgaria Mini: June 27-29
CanWest: July 10-13
Switzerland: Aug 14-17
Romania: Aug 22-24
Austria: Sept. 11-14
California: September 18-21
France: September 19-21
Germany Autumn: Oct 30-Nov 2

Add yourself to the Updates List for each event!

Questions about an event? Ask here

See all event details

 
World's most listened to Adventure Motorbike Show!
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...

Adventurous Bikers – We've got all your Hygiene & Protection needs SORTED! Powdered Hair & Body Wash, Moisturising Cream Insect Repellent, and Moisturising Cream Sunscreen SPF50. ESSENTIAL | CONVENIENT | FUNCTIONAL.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)



Ripcord Rescue Travel Insurance.

Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.

Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers and travel is covered on motorcycles of all sizes.
(ONLY US RESIDENTS and currently has a limit of 60 days.)

Ripcord Evacuation Insurance is available for ALL nationalities.


 

What others say about HU...

"This site is the BIBLE for international bike travelers." Greg, Australia

"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK

"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia

"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA

"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada

"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa

"This is the answer to all my questions." Haydn, Australia

"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany

Lots more comments here!



Five books by Graham Field!

Every book a diary
Every chapter a day
Every day a journey
Refreshingly honest and compelling tales: the hights and lows of a life on the road. Solo, unsupported, budget journeys of discovery.
Authentic, engaging and evocative travel memoirs, overland, around the world and through life.
All 8 books available from the author or as eBooks and audio books



Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!

Your ad could be here, on EVERY page of the HUBB, or the whole website, or as many as you like!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.



All times are GMT +1. The time now is 22:19.

Contact Us - Horizons Unlimited Motorcycle Travellers Website - Archive - Privacy Statement - Top