Jump to content
cyclopticgaze

retracting brake caliper pistons

6 posts / 980 viewsLast Reply

Recommended Posts

I'm having trouble retracting two of the pistons in my brake calipers up front. The brake system has been bled dry, and I've opened the reservoir top and even loosened the bleeding nipples on the calipers. I've managed to get the other pistons retracted by prying between them and the rotor with a flathead screwdriver, but these last two just won't budge. And I've been none too gentle. I've squirted penetrating oil on one and WD-40 on the other and neither has worked. I've even used the screwdriver as a wedge, hammering it in there. Am I missing something, or are these things just bound up really really well?

They're sticking out, by the way, because I pumped the pedal a few times to make sure they would work, prior to bleeding the system dry to replace the hoses. Most work.

And this car sat in some guy's driveway for three years, just so you know where things are starting.

Share this post


Link to post
Share on other sites

Pistons are very brittle. Be extra careful not to break them when prying.

PRY HARDER!!

Use a thin, old brake pad up against the rotor. Bolt the caliper back on the strut housing and try a big 'ol crowbar or a bigger screwdriver. They will free up. Also think about rebuilding/replacing. Ifyour calipers are that frozen they may freeze up again and that's no fun. Once freed up pull back the rubber boot and apply appropriate lube. Work them back and forth a bit before re-installation

Share this post


Link to post
Share on other sites

In our shop we always use channel locks, and that always works. Haven't tried it on 2002 calipers though. If they are frozen we always rebuild them, at least replace the o-rings.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.