View Full Version : Indicator Marks on Critical Component Fasteners

05-03-2014, 11:24 AM
Here is a question that hopefully Clarkz71 can best answer. Many of the critical component fasteners on my car are marked with a dab of red paint. I’ve always regarded this practice as a “torqued to spec” indicator.

Here is an example: 29063

On some fasteners a line is painted across the mating surface to indicate if the fastener is backing off from its set position (ex. brake line fastener to master cylinder reservoir).

Question: Did the cars come from the factory to the dealerships with these, and/or is this a standard practice done by MB factory trained technicians when they replace these components?

Looking back thru the car's service receipts, all previous work was done either by MB dealership or MB-specific independents.

05-03-2014, 02:12 PM
Porsche did these markings during production.
They did the same on their own cars as well.

05-03-2014, 02:26 PM
Torque stripping striping is the aerospace standard. Multiple colors, so the mechanic and quality can both show they did their jobs... and you can see if the fastener loosened or moved.


05-23-2014, 09:36 AM
Good to know. I'm using this industrial marker on my work.29382