Brake feel - Wrist Twisters
 
Thread Tools Display Modes
post #1 of 11 Old 06-05-2014, 01:38 PM Thread Starter
Tesserarius
 
CKutz_GO's Avatar
 
Join Date: Feb 2014
Location: Frederick
Posts: 607
Rep Power: 1
 
Brake feel

Real simple question guys, as i plain just don't remember or no the difference between stainless line and regular (last bike had stainless).

When i first start out on the bike my front brake is weak. after a couple pulls it firms up.. it might loosen up if i don't use it for awhile.. haven't really thought about it. Is this air/moisture in the line that gets compressed and then i don't notice it? or is this how rubber lines perform? or is this how breaks always are haha

I believe SS lines are for preventing expansion of the line (causing inconsistent feel) under hard breaking.. but i thought i'd check as i'm trying to put off doing any work to the bike till i have to! the last bike was being rebuilt till the end of june last year and this year i'm all about the "get on and go" niner and getting in as much as I can. I just rolled over 10k miles so it's probably due for a break bleed anyways but the fluid doesn't look atrocious yet. 2500 miles in 2.5 months.

CKutz_GO is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 06-05-2014, 02:16 PM
(Quintus) Pilus Prior
 
beefsalad's Avatar
 
Join Date: Dec 2007
Location: San Antonio, TX
Posts: 2,777
Blog Entries: 51
Rep Power: 1
 

Awards Showcase
Donation 
Total Awards: 1

It certainly sounds like air in the line to me. Pump it a few times and the bubbles disperse. Try putting a ziptie around the throttle and brake lever overnight. It may let the air bubbles rise into the mastercylinder. I don't see moisture compressing much. I won't comment on the action of SS lines, but they feel better to me. Hopefully they have the same effect on the CBR250 as they did the 919. I swear the CBR250 gives 0 brake feedback.

if you love your motorcycle, set it free.. if it comes back and hits you.. you highsided
beefsalad is offline  
post #3 of 11 Old 06-05-2014, 02:41 PM Thread Starter
Tesserarius
 
CKutz_GO's Avatar
 
Join Date: Feb 2014
Location: Frederick
Posts: 607
Rep Power: 1
 
Good point on the moisture haha

CKutz_GO is offline  
 
post #4 of 11 Old 06-05-2014, 02:44 PM
rmb
Let's go!
 
rmb's Avatar
 
Join Date: Aug 2009
Location: Sussex Couty NJ
Posts: 7,655
Rep Power: 1
 

Awards Showcase
Wrist Twisters Event Attendance Wrist Twisters Event Attendance Wrist Twisters Event Attendance Wrist Twisters Event Attendance 
Total Awards: 9

You might want to replace the brake fluid if you haven't already, when was it changed last? I wouldn't let it go more than two seasons.

rmb is offline  
post #5 of 11 Old 06-05-2014, 02:49 PM
Left of Centre
 
K1w1Boy's Avatar
 
Join Date: May 2011
Location: Auckland, NZ
Posts: 3,611
Rep Power: 1
 
At my last tyre change, I bumped the front brake lever and shot the pistons a fair way out of the calipers - not excessive, just more than the usual travel - and had to lever them back in to make way for the disk as I replaced the wheel.

After the reassembly, I found a lot more early bite in my brakes than was there previously, so the extension/ retraction process must have disturbed some lurking bubbles, and finally chased them away. You might want to give it a try.

K1w1Boy is offline  
post #6 of 11 Old 06-05-2014, 03:01 PM
LDH
Test Rider
 
LDH's Avatar
 
Join Date: Feb 2006
Location: by the ocean
Posts: 4,412
Rep Power: 1
 

Awards Showcase
Trackday Recognition Referral Award 
Total Awards: 2

Old fluid, old lines and a little air in the system can contribute to a lever that requires being pumped up initially, but many times there is a slow leak somewhere that is the real culprit.

Spend the time to replace the fluid and then bleed the lines properly. Once the lever is firm it should remain that way period. If it gets squishy an hour, a day or a week later you have a leak somewhere.

LDH is offline  
post #7 of 11 Old 06-05-2014, 03:09 PM Thread Starter
Tesserarius
 
CKutz_GO's Avatar
 
Join Date: Feb 2014
Location: Frederick
Posts: 607
Rep Power: 1
 
Quote:
Originally Posted by LDH View Post
Old fluid, old lines and a little air in the system can contribute to a lever that requires being pumped up initially, but many times there is a slow leak somewhere that is the real culprit.

Spend the time to replace the fluid and then bleed the lines properly. Once the lever is firm it should remain that way period. If it gets squishy an hour, a day or a week later you have a leak somewhere.
Alright thanks!

CKutz_GO is offline  
post #8 of 11 Old 06-05-2014, 03:10 PM
LDH
Test Rider
 
LDH's Avatar
 
Join Date: Feb 2006
Location: by the ocean
Posts: 4,412
Rep Power: 1
 

Awards Showcase
Trackday Recognition Referral Award 
Total Awards: 2

If you have any problems along the way PM me and I will get you sorted.

LDH is offline  
post #9 of 11 Old 06-05-2014, 03:14 PM Thread Starter
Tesserarius
 
CKutz_GO's Avatar
 
Join Date: Feb 2014
Location: Frederick
Posts: 607
Rep Power: 1
 
Quote:
Originally Posted by rmb View Post
You might want to replace the brake fluid if you haven't already, when was it changed last? I wouldn't let it go more than two seasons.
Yup, not really sure when it was last changed. But sounds like its due for it. Was hoping it was normal for the first couple squeezes to be squishy but sounds like its getting added to the stop-riding-and-maintain list haha

Thanks guys.

CKutz_GO is offline  
post #10 of 11 Old 06-05-2014, 03:32 PM
LDH
Test Rider
 
LDH's Avatar
 
Join Date: Feb 2006
Location: by the ocean
Posts: 4,412
Rep Power: 1
 

Awards Showcase
Trackday Recognition Referral Award 
Total Awards: 2

Use the Valvoline DOT3/4 stuff you can get from any auto parts store. It's about $2.99 a bottle and works excellent even for track use. Saves you a bundle over motorcycle specific brake fluids.

LDH is offline  
post #11 of 11 Old 06-05-2014, 04:36 PM
Tirone Choolaces
 
marylandmike's Avatar
 
Join Date: Aug 2007
Location: USA
Posts: 11,147
Rep Power: 1
 
Garage

Awards Showcase
Wrist Twisters Event Attendance Donation Donation 
Total Awards: 3

Quote:
Originally Posted by LDH View Post
Use the Valvoline DOT3/4 stuff you can get from any auto parts store. It's about $2.99 a bottle and works excellent even for track use. Saves you a bundle over motorcycle specific brake fluids.
That's what I use...being a cheap bastard and all

marylandmike is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Wrist Twisters forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome