[jlaa]

Mine rounded off when trying to remove it (even w/ a flare nut wrench), and a new one is $43. Surely there must be a generic equivalent one can use after I get this out. Thanks.

 

[khomer2]

good Q.

Brake caliper bleed screw - what size?

I'm trying to bleed the brakes on my '85 500SL after re-installing the ABS unit & of course one is seized solid. I know how potentially bad this is but with luck I'll get it out without snapping it. :bowdown: I know I can get replacements from the main dealer but I would rather avoid having to...

www.benzworld.org

bleed screw/valve on the ABS side?
M8x1.25 OR
M10x1.0 ?

 

[sbaert]

That is not a generic brake bleeder screw. The $43 is trivial, but the trick will be to get the old one out.

My suggestion is to get a can of PB blaster or Bulldog and apply several times over a 72 hour period.

And then use a sacrifical socket to weld onto the rounded bleeder screw.

use a inductive heating coil to heat up the area around the bolt, but not the bolt itself.

Then remove using a ratchet.

 

[jlaa]

That is not a generic brake bleeder screw. The $43 is trivial, but the trick will be to get the old one out.

My suggestion is to get a can of PB blaster or Bulldog and apply several times over a 72 hour period.

And then use a sacrifical socket to weld onto the rounded bleeder screw.

use a inductive heating coil to heat up the area around the bolt, but not the bolt itself.

Then remove using a ratchet.

Thanks. Don't these induction coil things heat the bolt and not the area around the bolt (opposite what you suggest)?

Induction Ductor Magnetic Heater Kit Bolt Remover Flameless Heat Tool +Soft Coil | eBay

Features: 1.Flameless Lossless Heating system Green&Safety 2.1 minute Removal process/97%Lower power consumption by/1 cent removing 1 bolt only cost you 1 cent/1.9 Kg weight with 3. adopt heat conduction technology, no flame, safe and environmental protection. It greatly reduces the risk of...

www.ebay.com

 

[sbaert]

The idea is to make the ABS block expand since it is made from aluminum. Aluminum expands quicker than a steel bolt.

The expansion will cause the galvanic corrosion on the threads of the bolt to let loose.

 

[sbaert]

One more thing, before welding on a vehicle make sure you disconnect and remove the battery.

Otherwise you are likely to cause a host of electrical issues and/or vehicle damage.