The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: cal43
Posted On: 13 Minutes Ago
Replies: 49,470
Views: 8,048,081
0 Keep & Kill
Last Post: Graywolf
Posted On: 17 Minutes Ago
Replies: 19,565
Views: 1,167,365
0 Any experience with REBUILT title?
Last Post: 45Brit
Posted On: 34 Minutes Ago
Replies: 8
Views: 122
0 Hottie of the day, no nudity.
Last Post: cal43
Posted On: 47 Minutes Ago
Replies: 26,046
Views: 2,674,761
0 Hot Chicks on Hot Bikes
Last Post: cal43
Posted On: 48 Minutes Ago
Replies: 11,579
Views: 2,369,890
0 Secret Australian Business
Last Post: Ireeman
Posted On: 1 Hour Ago
Replies: 36
Views: 2,036
0 Smoke and top end job
Last Post: SHAKY DAVE
Posted On: 5 Hours Ago
Replies: 30
Views: 1,963
0 Mimi the Deerslayer: the triple threat
Last Post: thecarfarmer
Posted On: 5 Hours Ago
Replies: 0
Views: 41
0 Gas tank rust!
Last Post: Piemonte
Posted On: 6 Hours Ago
Replies: 21
Views: 1,170
0 Boardtracker Project
Last Post: JonesL
Posted On: 6 Hours Ago
Replies: 644
Views: 131,830
4 2021 - only 3 Sportster models left
Last Post: Whitewalls
Posted On: 6 Hours Ago
Replies: 16
Views: 462
0 gerotor pump details
Last Post: IXL2Relax
Posted On: 7 Hours Ago
Replies: 9
Views: 254
0 1986-90 Evo Sportsters: What every owner should know but were afraid to ask
Last Post: IXL2Relax
Posted On: 7 Hours Ago
Replies: 442
Views: 68,572
0 Sweetwater Motorcycle Rally & Cook-Off
Last Post: sportsterpaul
Posted On: 7 Hours Ago
Replies: 1
Views: 68
0 This week on Craig's list
Last Post: BitterOldMan
Posted On: 8 Hours Ago
Replies: 5,031
Views: 732,314
0 Mid West Meet & Greet
Last Post: Crusty
Posted On: 8 Hours Ago
Replies: 811
Views: 80,747
0 Power vision vs. TTS; Crank Tooth Setting
Last Post: 60Gunner
Posted On: 9 Hours Ago
Replies: 0
Views: 56
0 Identity crisis
Last Post: Iron Mike
Posted On: 10 Hours Ago
Replies: 48
Views: 3,565
0 Paid Hammer, Parts Are In The Mail
Last Post: Turbo Sporty 48
Posted On: 10 Hours Ago
Replies: 9
Views: 530
0 Transformer XR1200
Last Post: Davo_137
Posted On: 11 Hours Ago
Replies: 516
Views: 61,960
0 did .you ever kick a good man when he,, was down
Last Post: Toejam503
Posted On: 11 Hours Ago
Replies: 3
Views: 230
0 valve seals?
Last Post: 11B40
Posted On: 12 Hours Ago
Replies: 31
Views: 1,823
0 Food porn
Last Post: Stairman
Posted On: 13 Hours Ago
Replies: 2,211
Views: 458,874
0 Removing Rear Shock
Last Post: wedge
Posted On: 13 Hours Ago
Replies: 29
Views: 1,119
0 January 19th, 2021 New model launch event
Last Post: jimmyess333
Posted On: 14 Hours Ago
Replies: 11
Views: 861
0 1200S Small retro Air Filter
Last Post: FuriousGeorg
Posted On: 14 Hours Ago
Replies: 1
Views: 82
0 Luggage rails?
Last Post: Mike1nw
Posted On: 15 Hours Ago
Replies: 3
Views: 631
0 Front shock upper bolts
Last Post: Mike1nw
Posted On: 15 Hours Ago
Replies: 5
Views: 509
0 Any Banjo-Playing Sporty Riders here?
Last Post: 45Brit
Posted On: 16 Hours Ago
Replies: 45
Views: 3,213
0 Arlen Ness Big Sucker question
Last Post: Nailz
Posted On: 17 Hours Ago
Replies: 7
Views: 162
More...
Members Birthdays
Tags
bore size, master cylinder, piston

Reply
 
Share Thread Tools Display Modes
  #1  
Old 20th May 2019
Roane Roane is offline
XL FORUM TEAM MEMBER
 
Join Date: Oct 2018
Posts: 137
Sportster/Buell Model: Sportster
Sportster/Buell Year: 1977
Reputation: 19759
Roane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to all
Default what brake master cylinder can I use?

I posted this question in another thread about an electrical problem I am having but thought I should probably separate it as it is related to me but unrelated to you.

Any idea the bore size of this master cylinder (is OEM for my bike I think... 1977 sporty) but it’s running to dual calipers (no idea the number of pistons and there are no markings anywhere I can find stating bore size anywhere).
The calipers look like they might be V-Twin.
https://www.jpcycles.com/product/241...left-and-right

This is the pricey master I want to use, which comes in 9/16" or 11/16"
https://www.rolandsands.com/product/...r-mount/chrome

Here are the links to the pics from my bike.
http://xlforum.net/forums/attachment...5&d=1558298552

http://xlforum.net/forums/showthread...2072109&page=3
Reply With Quote
  #2  
Old 21st May 2019
mickey t's Avatar
mickey t mickey t is offline
Land Speed Record
 
Join Date: Jan 2015
Posts: 734
Sportster/Buell Model: ironhead sporty
Sportster/Buell Year: 79
Reputation: 109791
mickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud of
Default

72xlh....where are ya I need ya...cashh is waiting n did they make headlights like thos

Sent from my LM-X210APM using Tapatalk
Reply With Quote
  #3  
Old 21st May 2019
Roane Roane is offline
XL FORUM TEAM MEMBER
 
Join Date: Oct 2018
Posts: 137
Sportster/Buell Model: Sportster
Sportster/Buell Year: 1977
Reputation: 19759
Roane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to all
Default

nice bike mike... any thoughts on my master cylinder possibilities...
Reply With Quote
  #4  
Old 22nd May 2019
just1pepsi's Avatar
just1pepsi just1pepsi is offline
Greasemonkey
 
Join Date: Jan 2005
Posts: 113
Reputation: 2482
just1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the roughjust1pepsi is a jewel in the rough
Default

https://www.joesracing.com/master-cylinder-math/

The link above contains probably everything you could ever want/need to know about brakes.

Basically: Smaller bore's are more difficult to push, and must be pushed farther to move the same amount of fluid as a larger bore.

The bore size on a 1983' that came with dual disc's from the factory is: 3/4" (12/16")

I ran the 70's style Master Cylinder for years, and it was admittedly more difficult to pull, but did the job - It did however, eventually seize up, but that I attribute more to it being a Chinese copy.

GMA makes some fairly priced USA made master cylinders in several bore sizes with various finishes and switch options. When I replaced my Chinese knock-off 70's style MC, I used a GMA with a 5/8" (10/16") bore - It works fine for me.

Here is their part list - Look for the part numbers starting at: GMA-HC

http://beltdrives.com/wp-content/upl...st-For-CCI.pdf
__________________
- 83' Iron -
Reply With Quote
  #5  
Old 22nd May 2019
Roane Roane is offline
XL FORUM TEAM MEMBER
 
Join Date: Oct 2018
Posts: 137
Sportster/Buell Model: Sportster
Sportster/Buell Year: 1977
Reputation: 19759
Roane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to all
Default

Thanks,
I'm not sure what's on there now but the connection to the brake lines is pretty small diameter. Is it advisable to get new connection hardware? I've not done this before so apologies if this is usual.
Reply With Quote
  #6  
Old 22nd May 2019
Iron Mike Iron Mike is offline
Custom Bike Builder
 
Join Date: Dec 2014
Location: Phoenix
Posts: 2,298
Sportster/Buell Model: xlch
Sportster/Buell Year: 1964
Sportster/Buell Model #2: XLCH IR EFI
Sportster/Buell Year #2: 1971
Other Motorcycle Model: BMW K1200RS
Other Motorcycle Year: 2001
Reputation: 1726771
Iron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond repute
Default

Single disc requires less displacement of fluid per amount of lever travel---smaller bore
Dual requires more--larger bore
Large bore with single disc will displace more than enough fluid required in less lever travel resulting in very firm short travel
Small bore with dual will result in long travel and softer lever
Reply With Quote
  #7  
Old 26th May 2019
Roane Roane is offline
XL FORUM TEAM MEMBER
 
Join Date: Oct 2018
Posts: 137
Sportster/Buell Model: Sportster
Sportster/Buell Year: 1977
Reputation: 19759
Roane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to allRoane is a name known to all
Default

So, I bit the bullet and got an 11/16 master cylinder. I neglected to get a banjo fitting though. Any idea which size I need?
Reply With Quote
  #8  
Old 27th May 2019
ryder rick's Avatar
ryder rick ryder rick is offline
Senior Master Custom Bike Builder
 
Join Date: Jun 2008
Location: Cornelius, OR
Posts: 9,510
Reputation: 1114996
ryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond repute
Default

I use a small master with dual single piston calipers on the FXR.
If I use more than 2 fingers on it I will lock the front wheel.
__________________
Ryder Rick "I know right from wrong, but sometimes, wrong feels right"
Reply With Quote
  #9  
Old 27th May 2019
Sadsack's Avatar
Sadsack Sadsack is offline
Senior Chief Harley Engineer
 
Join Date: Dec 2012
Location: Southwest Virginia
Posts: 1,030
Sportster/Buell Model: Xlh
Sportster/Buell Year: 1978
Sportster/Buell Model #2: FX
Sportster/Buell Year #2: 1983
Other Motorcycle Model: Road King
Other Motorcycle Year: 2014
Reputation: 65828
Sadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud ofSadsack has much to be proud of
Default

Quote:
Originally Posted by Roane View Post
So, I bit the bullet and got an 11/16 master cylinder. I neglected to get a banjo fitting though. Any idea which size I need?
No way of telling for sure without seeing it. Any auto parts will have what you need and will be able to match your parts.
__________________
I've often run with the devil, but I've never made any deals....
Reply With Quote
  #10  
Old 27th May 2019
ryder rick's Avatar
ryder rick ryder rick is offline
Senior Master Custom Bike Builder
 
Join Date: Jun 2008
Location: Cornelius, OR
Posts: 9,510
Reputation: 1114996
ryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond reputeryder rick has a reputation beyond repute
Default

10mm or 3/8" banjo bolt threads (not interchangeable)
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 +1. The time now is 09:38.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC