They are made of steel but being hollow except for the conical seating surface at the base, they don't tolerate a lot of torque. They simply shear. This has happened to be at least three times and is a major pita. The last time it happened was on my pagoda. I couldn't get a replacement caliper soon enough for a pagoda gathering I organized so I drilled it out. I damaged the caliper threads a bit but it all came out leaving the conical seating surface unscathed. While bleeding some brake fluid would leak past the damaged threads but once tightened it formed an airtight leak free seal. I really don't care to have to deal with this problem again!
Sent from my iPhone On Dec 4, 2011, at 5:45 PM, Allan Streib <str...@cs.indiana.edu> wrote: What are the bleeder screws actually made of? Brass? Steel? Do they so often get stuck due to galvanic action between dissimilar metals or simply rusting? G Mann <g2ma...@gmail.com> writes: Teflon tape should NOT be used in hydraulic systems. The seal effect relys on the cone shape of the tip and the area it sets in.. NOT the threads. More importantly, anti-seize compounds use materials that make a barrier against the thread and the body doing a "rust weld" and becoming one solid piece. Teflon does not do that, and in fact is not a very "tough" material.. ie. a teflon coated cooking pan must always use plastic food turners and such to keep from scratching through the surface. As soon as you thread the bleeder fitting on to the bore, it does exactly that, and you will have metal to metal contact that will rust in a salt / moisture environment. Grant... AZ... "Where diesels roam free" -- 1983 300D 1979 300SD _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
