Cleaning caliper pistons/ Cleaning???



5 replies to this topic
  • Jimmy_K

Posted January 06, 2002 - 08:20 AM

#1

I put new pads on my 400f and now my brakes drag (front). Someone on this board suggested I nedd to clean the pistons. What is the proper method for doing this? I checked to make sure the pads are flat , and they are. I also put my old pads back in and the problem was gone (no more drag).I am assuming that whoever said the pistons are sticking is correct.Whats the next step??

  • Ronin

Posted January 06, 2002 - 05:04 PM

#2

how bad are the pads dragging??? if they only hit a little bit and make a scraping sound it is not a problem. if they actually make the wheel slow down then your calipers need to be cleaned. just remember the only force pulling back the pads is the return of the master cylinder. there is no spring the pads simply rub a bit without applying much pressure. to clean the caliper you must remove all the fluid from the system and dismantle the caliper per the instructions in your service manual. use a good quality brake parts cleaner that wont flashover so that you dont have any happy little fires in your garage. good luck, I have never dismantled the caliper on my WR but on my Buells it is a very simple procedure that only takes a few minutes.

later,
Ronin

  • cwisa

Posted January 06, 2002 - 05:58 PM

#3

sa dah tay

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • DaveJ

Posted January 06, 2002 - 09:29 PM

#4

Jimmy,

There are a few reasons why the pads will drag.

First thing, reset them by pushing them back into the caliper slightly. Then pump them back out. If they still drag, you either have sticky pucks or too much fluid in the master cylinder.

The only way to clean the caliper is to remove it from the bike. Compresses air, some small wood or plastic blocks, (and some safety glasses) will allow you to blow out the pucks.

Yamaha recommends replacing the seals at each rebuilt. For the price, I would do it.

Clean things up with brake cleaner followed by compressed air then reassemble.

In some cases, certain high performance brake fluids don't mix well and cause some sticking as well, so you may want to rebuild the whole system if you have been doing this.

Also keep in mind that you'll need to tap the caliper, line and cylinder when ever you refill them (get's the air bubbles out). And of course, park the pucks before you bleed as well.

Be patient and do all you can to consider where the air get's trapped. Goes along way.

Hope this helps.

DaveJ

  • forloop

Posted January 07, 2002 - 04:39 AM

#5

The above advice is great. I just wanted to second checking your fluid level. Since I neglected to mention that when I posted about the brake caliper.

I'm sure this is a simple problem.

Good Luck,

  • Ronin

Posted January 07, 2002 - 07:51 AM

#6

the fluid level is the first thing to check....damn, I always forget to tell/do that. Hmmm....no wonder I always screw stuff up on my bikes. attention to detail, attention to detail, attention to detail.





Related Content

Forums
Photo

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride


Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies
Forums
Photo

YZ450FX OR YZ450F by MESSMAKER


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017
Forums
Photo

The "going back to the other darkside" adventure... by Monk


Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.