siezed callipers

mud_slinger · Post by **mud_slinger** » Fri Jan 04, 2008 1:29 pm

i have a rear seized calliper on my mu so far i have covered the it in crc and also under the dust seal round the piston, i have a 6 inch g clamp pushin on it wit a old brake pad and it not budgin i even put a longer bar on it and ended up bendin the handle on it :roll:

Anyone have any tips or lil secrets that could help? wood be much appreciated

nz4x4 · Post by **nz4x4** » Fri Jan 04, 2008 2:40 pm

I would pull the caliper off and replace the piston or give it a good clean. Only takes about an hour to fully rebuild a caliper.

WACKO · Post by **WACKO** » Fri Jan 04, 2008 4:36 pm

nz4x4 wrote:I would pull the caliper off and replace the piston or give it a good clean. Only takes about an hour to fully rebuild a caliper.

but to do that he needs to get the piston moving.... :wink:

try "inox". its a crc type stuff. works wonders. other than that you could maybe try a bit of heat? will stuff the seals tho.

dazza85 · Post by **dazza85** » Fri Jan 04, 2008 5:58 pm

Hi Mudslinger,
There is a trick with Isuzu rear disc's.
You need to back off the alan screw that adjusts the handbreak

Have a look about half way down ...

http://www.offroadexpress.co.nz/modules.php?name=Forums&file=viewtopic&t=8853

nz4x4 · Post by **nz4x4** » Fri Jan 04, 2008 6:23 pm

WACKO wrote:
nz4x4 wrote:I would pull the caliper off and replace the piston or give it a good clean. Only takes about an hour to fully rebuild a caliper.

but to do that he needs to get the piston moving....

try "inox". its a crc type stuff. works wonders. other than that you could maybe try a bit of heat? will stuff the seals tho.

Pull the caliper off and blow compressed air into the brake fluid inlet, make sure ur get a good seal so pressure builds up, the piston will come out with a lot of force if its seized well so be careful. I reccomend a block of wood in front of the piston so it doesnt do any damage.

wopass · Post by **wopass** » Fri Jan 04, 2008 7:07 pm

dazza85 wrote:Hi Mudslinger,
There is a trick with Isuzu rear disc's.
You need to back off the alan screw that adjusts the handbreak

Have a look about half way down ...

http://www.offroadexpress.co.nz/modules.php?name=Forums&file=viewtopic&t=8853

what he said.... dazz beat me to it :roll:

4wdnuts · Post by **4wdnuts** » Fri Jan 04, 2008 8:09 pm

nz4x4 wrote:
WACKO wrote:
nz4x4 wrote:I would pull the caliper off and replace the piston or give it a good clean. Only takes about an hour to fully rebuild a caliper.

but to do that he needs to get the piston moving....

try "inox". its a crc type stuff. works wonders. other than that you could maybe try a bit of heat? will stuff the seals tho.

Pull the caliper off and blow compressed air into the brake fluid inlet, make sure ur get a good seal so pressure builds up, the piston will come out with a lot of force if its seized well so be careful. I reccomend a block of wood in front of the piston so it doesnt do any damage.

compressed air only works on one piston. youll still have trouble getting the others out.

Big-AL · Post by **Big-AL** » Fri Jan 04, 2008 10:17 pm

haha i spent hours trying to push my MU's piston back in, finally took it to a mechanic, and he showed me the little allan screw that needs undoing.

the funny thing was, we had pushed the other side piston back in with very little effort :shock:

haha something must not have been right.

mud_slinger · Post by **mud_slinger** » Sat Jan 05, 2008 9:09 am

well thanks guys for the help, never encountered the allan key before :roll:

guess it called a mysterious utility for a reason :twisted: