Originally Posted by qdeezie
Ok, this thread has my attention.
I just had a problem with my Ford Focus brake calipers seizing up using this stuff and did not connect the dots. I figured dirt somehow got into the caliper boot and caused the pin to seize up. I replaced the pins and boots on both sides of my vehicle literally on Wednesday this week and lubed them with Permatex Purple. I went to Amazon to read about this product, then made my way over to the source itself - Permatex's site - and this stuff is meant for metal to metal contact.
Great. My car has rubber boots (metal to rubber contact).
Looks like I have to tear into my brakes right now and get this stuff off and hope it hasn't already caused damage to my rubber boots.
In y'all's opinion, would it make sense just to order new rubber boots and play it safe or hope that no damage has occured to the new boots over the last few days?
The marketing is extremely, extremely confusing. The Permatex bottle says for metal-to-metal contact on the back. The front says fine for caliper slide pins. Eric of South Main Auto on YouTube uses this stuff on everything without a care in the world. The Permatex website says metal-to-metal contact only. This datasheet from Permatex (linked below) says that the purple stuff conforms with JIS K2228 8.10 standard, which is a Japanese standard about compatibility of substances with rubber and EPDM (like caliper boots). JIS K 2228 specifies a non-petroleum base rubber lubricant.
https://441py33rout1ptjxn2lupv31-wpengine.netdna-ssl.com/wp-content/uploads/tech_docs/tds/20354.pdf
So, really, everyone is saying different things. I decided to return the Permatex purple and got some 100% silicone paste grease instead. I'm not in the business of supporting businesses that can't even get their information straight.