Brake bleed nipple seized

Z

Zikim

Active member
Have just upgrade the front brakes to 325mm discs but unfortunately could not bleed system properly due to one of the rear caliper bleed nipples stuck/seized. Did not want to force it just in case it broke, does anyone know a way of loosening it?
 
Its not an easy one!
Heat may help but caliper would need removed.
unless you have accetylene like this guy https://www.youtube.com/watch?v=KnJ4IQVritU

Once you snap its a caliper off :cry: I take it you are using a Hex socket not multi point socket.
You could bleed the system to the caliper by slackening a union before the caliper. Messy and would not bleed the caliper body

Also
https://www.youtube.com/watch?v=gn-CvqvXguU

Good luck :thumbsup:
 
Easiest way is to drown it in wd40 and leave it overnight, next day get a spanner on it and don't hold back, if it snaps you've lost nothing, if it rounds off then get some mole grips on it then go buy a new bleed nipple, they cost pennies :thumbsup:
 
try tapping the nipple with copper hammer, while putting pressure on the spanner, if you wreck nipple just get replacement. :D
 
If you have access to heat ie acetylene or a small blow torch,just warm the nipple up,it should free up.
 
Buy a new bleed nipple with the intention of fitting it before you start again. Then wrap a small rag around the nipple and soak it with Plusgas or diesel fuel and leave it over night. Then apply a pair of mole grips to the hex of the nipple and make sure it's on tight and if possible put a metal pipe over the handles to make a long lever and apply force slowly and remove the nipple and replace.
 
Smartbear said:
don't use wd40 as its not a penetrating oil, it's a water dispersant
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I should have been more specific, wd40 is now a brand name, i should have said:
WD-40 Specialist Fast Release Penetrant :thumbsup:
 
Thanks for all the replies guys. Soaked it in penetrating oil all night and then applied a bit of extra force and it came loose :thumbsup:
 
A bit of good advice with tight bolts. Try tightening a little before undoing. It moves the thread a little in the direction it stressed. That is very often enough to get it moving brake a rusty bond without braking the bolt. :thumbsup:
 
Machine monkey said:
A bit of good advice with tight bolts. Try tightening a little before undoing. It moves the thread a little in the direction it stressed. That is very often enough to get it moving brake a rusty bond without braking the bolt. :thumbsup:
Click to expand...

+1 :thumbsup: This trick works.... my Dad taught me this one MM
 
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