I've just been out doing my rear brake pads and found the nearside piston seized so i cracked the bleed nipple to release some pressure and the nipples come away complete with threads. Is this a case a new caliper? I hope not as i'm already pissed off and have been loaded with the flu all week :cry:

cut a thread one size larger and insert the appropriate thread ring corresponding to the thread size of the bleed nipple...that might work

using one of these things >>>

 

http://etrade.daegu.go.kr/co/g/gtscorp/img/oimg_GC01421327_CA01421773.jpg

You may get away with drilling and tapping out the caliper to accomodate a larger bleed nipple, however make sure any metal fragments that get into the bleed hole are cleaned out..

The only problem using a helicoil as suggested above it that they require a much bigger hole and may be too close to edge of caliper and make it weak around the outer edge.

Failing that i'm afraid a different caliper, it's possibly yours is already N/G as its already sticking.. hope you get it sorted either way

Thanks guys, i've got the piston free now so i'll try the drilling and re-tapping route first before i try a heli-coil. I thought that bleed nipples were a standard size so hopefully i'll be able to get a slightly larger threaded nipple and i'll cut the thread to suit.

"heli-coil." ah..so that´s what you call them :)

Thanks guys, i've got the piston free now so i'll try the drilling and re-tapping route first before i try a heli-coil. I thought that bleed nipples were a standard size so hopefully i'll be able to get a slightly larger threaded nipple and i'll cut the thread to suit.

 

You may be able to use an imperial rather than a metric one. Find a friendly engineering shop, or a motor factor who'll yet you look at all the similar sized bleed nipples.

You may be able to use an imperial rather than a metric one. Find a friendly engineering shop, or a motor factor who'll yet you look at all the similar sized bleed nipples.

Are the imperial nipples bigger than the metric? This might work out if they are.

Cheers Andy. :duffer:

imperial threads to have different pitches from the metric. If your going to drill it out, i'd go for another metric thread.

Yeah, but if the thread is already gone and you're going to tap it to a larger size, then the coarser imperial thread is more suited to soft alloy.

Yeah, but if the thread is already gone and you're going to tap it to a larger size, then the coarser imperial thread is more suited to soft alloy.

 

Good point!