Tapered Pad Wear

[The Critic]

16 E350, 147K.
This set of pads has 53K. The originals went 93k+. Both sets of pads were Genuine MB.

This is an ATE style caliper. The pads were fitting correctly in the caliper (not difficult at all to remove), guide pins were smooth and piston retracted smoothly.

Any ideas?

 

[Eddie]

The caliper was cocked or loose.

 

[Trav]

Are both tapered the same?

 

[The Critic]

Are both tapered the same?

No, they are not....which is the puzzling part.

 

[Trav]

Can you post a pic of how they were in the caliper?

 

[Trav]

I think I see the problem. It may have been free once the caliper was removed but in operation it looks like it may have been hanging.

 

[2EHA]

same thing happened to a car i changed the pads on.

ears sticking on bracket caused accelerated and tapered wear

 

[The Critic]

I think I see the problem. It may have been free once the caliper was removed but in operation it looks like it may have been hanging.

View attachment 61419

I think you are correct. I will give the bracket a good cleaning and lube the ears. Previously, I had used 3M copper anti-seize brake lube. Perhaps that was inadequate.

 

[Trav]

Yeah I think you are right, it isn't very long lived in this application. I have had good luck with this one.

https://www.amazon.com/CRC-Brake-Caliper-Synthetic-Grease/dp/B000M8PZGE?th=1

 

[The Critic]

Yeah I think you are right, it isn't very long lived in this application. I have had good luck with this one.

https://www.amazon.com/CRC-Brake-Caliper-Synthetic-Grease/dp/B000M8PZGE?th=1

Looks like that is silicone grease with some moly mixed inside.

 

[JHZR2]

Looks like that is silicone grease with some moly mixed inside.

??

polypropylene glycol monobutyl ether…

 

[MParr]

Yeah I think you are right, it isn't very long lived in this application. I have had good luck with this one.

https://www.amazon.com/CRC-Brake-Caliper-Synthetic-Grease/dp/B000M8PZGE?th=1

Is there any difference in the applications for the CRC Synthetic Brake Caliper Grease and the CRC Silaramic Brake System Grease? I’ve been using the Silaramic.
https://www.crcindustries.com/products/silaramic-174-brake-system-grease-5-wt-oz-05361.html

 

[SoNic67]

I think you are correct. I will give the bracket a good cleaning and lube the ears. Previously, I had used 3M copper anti-seize brake lube. Perhaps that was inadequate.

That area is hard on lube. High temperature and pad dust.
I prefer to have synthetic high temp grease there, and new stainless steel or brass hardware on bracket (if the design has those).

PS: That's from my 2000 Sonata. Brembos came with their own grease and SS hardware.

 

[The Critic]

??

View attachment 61437

polypropylene glycol monobutyl ether…

News to me, thanks for sharing. When I have used it, the product reminded me of a somewhat thick silicone paste with moly. But I guess it is something else.

Is there any difference in the applications for the CRC Synthetic Brake Caliper Grease and the CRC Silaramic Brake System Grease? I’ve been using the Silaramic.
https://www.crcindustries.com/products/silaramic-174-brake-system-grease-5-wt-oz-05361.html

In my limited experience, the silaramic product was very short lived once exposed to the elements. It is probably fine for lubricating OE style two-piece shims. I think I gave the tube to @nthach.

That area is hard on lube. High temperature and pad dust.
I prefer to have synthetic high temp grease there, and new stainless steel or brass hardware on bracket (if the design has those).

Unfortunately, this style of caliper does not use stainless steel shims in that area.

After further review, I used 3M's copper brake lube on the contact points of the caliper bracket. It appears that several brake pad manufacturers and vehicle OEM's have stated to not use copper based lube. Is it possible that the copper lube that I previously used, resulted in corrosion on the surface?

 

[nthach]

??

View attachment 61437

polypropylene glycol monobutyl ether…

Sounds like a surfactant to me. Butyl ethers are decent to good solvents and cleaners.

 

[nthach]

News to me, thanks for sharing. When I have used it, the product reminded me of a somewhat thick silicone paste with moly. But I guess it is something else.


In my limited experience, the silaramic product was very short lived once exposed to the elements. It is probably fine for lubricating OE style two-piece shims. I think I gave the tube to @nthach.

Unfortunately, this style of caliper does not use stainless steel shims in that area.

After further review, I used 3M's copper brake lube on the contact points of the caliper bracket. It appears that several brake pad manufacturers and vehicle OEM's have stated to not use copper based lube. Is it possible that the copper lube that I previously used, resulted in corrosion on the surface?

View attachment 61465
View attachment 61466
View attachment 61467

Well, if New Flyer trusts Plastilube on a bus that weighs up to 28 tons, it’s good enough for me to use it on non-rubber parts.

Yes, I do have that tube of Silaramic. I’ve used it on a drum brake job I did a while ago. The Prius is starting to be a little “chatty” lately - I’m going to try it out on that. Currently, I’m using Permatex’s new orange silicone lube.

 

[KGMtech]

Why the cautions about copper paste for brake parts applications?

 

[The Critic]

Why the cautions about copper paste for brake parts applications?

That is what I am trying to understand as well.

 

[Timmastertech]

AC Delco 10-4019 brake grease on the pad contact points and the slide pins. Looks like a pad or guide pin isnt sliding freely. The delco silicone is the best brake grease I have ever used and I have used almost all of them over the last 20 years. Its the same grease that is included in a genuine gm pad set

 

[The Critic]

AC Delco 10-4019 brake grease on the pad contact points and the slide pins. Looks like a pad or guide pin isnt sliding freely. The delco silicone is the best brake grease I have ever used and I have used almost all of them over the last 20 years. Its the same grease that is included in a genuine gm pad set

Yeah, I think the 3M copper anti seize left the surface a bit gummy. The wear on the bracket probably did not help.

But it is all better now. I cleaned the bracket well, lubed the contact areas with Permatex purple and buttoned it back up. Rotors were still smooth and well above minimum thickness so they were reused