Front caliper rebuild - 600RR.net
Troubleshooting Having trouble with your bike? Common know issues or trobuleshooting questions here.

 
LinkBack Thread Tools
post #1 of 6 (permalink) Old 02-23-2009, 02:10 PM Thread Starter
 
Join Date: Nov 2008
Posts: 255
Images: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Question Front caliper rebuild

The front brakes on my '91 have become just about useless, and I know it's not air in the lines (I checked) or the lines themselves (they're ss). So I have to face the messy truth - I need to rebuild the calipers. Besides taking the pistons out and removing any gook that might have become plastered on there and inside the caliper, and replacing the dust seals and the piston seals, is there anything else to it? Thanks all,
Nappy Priest is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 02-23-2009, 04:08 PM
World Superbike Racer
 
dcope17's Avatar
 
Join Date: Feb 2007
Location: Dana Point, Ca
Posts: 2,120
Thanks: 0
Thanked 12 Times in 11 Posts
Feedback Score: 1 reviews
If the seals on the calipers aren't leaking... then assuming everything you said is correct, something else is bad.

Calipers... bad if they're leaking or the brakes are dragging excessively. Rebuild means cleaning and replacing the seals.

MC. Its a piston that pushes the fluid into the lines. And if looses its seal... if you put a rubber band on the brake lever... it will look good when you first pull it but after a while... the lever will be pulled all the way to the handle.

If it feels spongy... I'd look at new fluid, look at new pads and bent rotors.

Ride hard today, Ride harder tomorrow,!
Walk close to Christ today, Walk closer tomorrow

How to fix headlights... Dreamzboy's excellent write-up
https://www.600rr.net/vb/showthread.php?t=138034
dcope17 is offline  
post #3 of 6 (permalink) Old 02-23-2009, 04:26 PM Thread Starter
 
Join Date: Nov 2008
Posts: 255
Images: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by dcope17 View Post
If the seals on the calipers aren't leaking... then assuming everything you said is correct, something else is bad.

Calipers... bad if they're leaking or the brakes are dragging excessively. Rebuild means cleaning and replacing the seals.

MC. Its a piston that pushes the fluid into the lines. And if looses its seal... if you put a rubber band on the brake lever... it will look good when you first pull it but after a while... the lever will be pulled all the way to the handle.

If it feels spongy... I'd look at new fluid, look at new pads and bent rotors.
Thanks bro. I have no leaks whatsoever, and the lever feel is firm - but no matter how hard I squeeze the lever, I just can't get much gripping power at the rotors. The rotors look/feel straight, and there's no wobble on the wheel when I squeeze the lever or any weird noises. There's plenty of meat left on the pads. I have not replaced the fluid in a long while - but I don't see how the fluid could become so compressible, even after so many years??
Nappy Priest is offline  
 
post #4 of 6 (permalink) Old 02-23-2009, 04:36 PM
Moto GP Racer
 
MXRider's Avatar
 
Join Date: Mar 2007
Location: Virginia
Posts: 9,216
Thanks: 70
Thanked 144 Times in 91 Posts
Feedback Score: 17 reviews
the seals could be swollen, which i recently found is common in 10 year old (and older) brakes.
this will cause them to drag excessively, so go for the rebuild man.
MXRider is offline  
post #5 of 6 (permalink) Old 02-23-2009, 05:41 PM Thread Starter
 
Join Date: Nov 2008
Posts: 255
Images: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by MXRider View Post
the seals could be swollen, which i recently found is common in 10 year old (and older) brakes.
this will cause them to drag excessively, so go for the rebuild man.
Thanks bro - that's what I'll do.
Nappy Priest is offline  
post #6 of 6 (permalink) Old 02-27-2009, 03:34 PM
Knee Dragger
 
Join Date: Mar 2008
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Yup most likely old seals - brake fuild does tend to eat at things after time 8-)
twilkinson3 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the 600RR.net 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



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

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