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PostPosted: May 2, 2019, 10:12 pm 
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Joined: June 8, 2010, 8:02 pm
Posts: 619
Location: White Rock, BC, Canada
Hey guys.

Since we have so many bright people here I'll throw a problem out there in hopes of some input. For the last 20yrs or so car makers are designing the clearances between the pads and the caliper bracket too tight. This reduces pad life significantly and is the main cause of brake wear on most modern cars. It more common than not to have to hammer the pads out of the brackets when removing. What happens is the pads and the caliper bracket rust, get thicker, and get tight on each other. The worst area is underneath the abutment clips where it creates a hard scale, preventing the pads from sliding.

So, as a mechanic I have two questions:
-what tools would you use to remove the scale build up on the caliper bracket? Current technique involves wire wheel, air chisel to gently break scale, and a square file.
-what product would you coat the area under the abutment clip to reduce future rusting? I've been using NeverSeize, but was wondering if silicone grease may last longer.

On personal vehicles I spend the time to grind down and shaped the pads to have more clearance, but it's not viable to do so on most customer cars.

Thanks for any input.
Cory

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PostPosted: May 2, 2019, 11:25 pm 
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Joined: April 5, 2008, 2:25 am
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Location: Fort Worth, Texas
I've never seen this on any of my cars.

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PostPosted: May 3, 2019, 8:54 am 
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Joined: July 17, 2008, 9:11 am
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Location: West Chicago,IL
On my cars, I simply apply wheel grease. I too, wire wheel the caliper. I also file the brake pad backing to fit the caliper if necessary. If I had the time, I would try some form of rust converter on the caliper as wire wheels do not get the root of the rust, only the top surface. In a shop situation, there is no time for that to dry.

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PostPosted: May 5, 2019, 9:21 am 
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Joined: February 2, 2017, 1:02 am
Posts: 63
Location: Illinois
I wire wheel the caliper brackets after the stainless clips are removed. Replace the clips. Then use a light coating of brake parts lubricant. My favorite so far has been some purple stuff made by permatex. Available at most parts stores for around $18. I haven't seen any more brake pads seizing since I've been doing brakes with this stuff (my cars or customer cars). I have found anti seize can't take the heat of disc brakes and tends to cook and/or wash off quickly.


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