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Old 11-26-2019, 03:06 PM
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Silly brake break-in question

I've never replaced my own brake pads & rotors before, but my son and I are going to give it a shot this weekend.

I've read the instructions and watched videos about breaking in the brakes - go out on an open road and do the 40 mph down to 10 mph five times without coming to a full stop, because a full stop will create some sort of spot on the rotors.

My question is... what if I have to come to a full stop GETTING to the road where I can take it up to 40 mph five times? Won't that screw it up?

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Old 11-26-2019, 03:15 PM   #2
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Originally Posted by mannaggia View Post
I've never replaced my own brake pads & rotors before, but my son and I are going to give it a shot this weekend.

I've read the instructions and watched videos about breaking in the brakes - go out on an open road and do the 40 mph down to 10 mph five times without coming to a full stop, because a full stop will create some sort of spot on the rotors.

My question is... what if I have to come to a full stop GETTING to the road where I can take it up to 40 mph give times? Won't that screw it up?
Follow the bedding procedure recommended by the pad manufacturer as best you can. The basics are you're trying to introduce heat into the rotors/pads in a controlled manner, making sure the pad material adheres evenly to the rotors. Obviously you have to come to a full stop where required prior to getting out on an open road. The hard braking from speed is what helps heat them up evenly so the mating surfaces bed in. Gradual slowing to a stop while driving to an open road will not do any harm. Proper bedding will increase your braking ability and increase life of the pad/rotors.
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Old 11-26-2019, 03:23 PM   #3
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While there is certainly some science involved in tempering things such as brake rotors to give them a chance at lasting a long time, I believe you'll be best served not doing any drastic, hard braking immediately after replacement. It shouldn't hurt anything sticking to gentle braking and/or following a regimen to "break them in" during the first several miles, but leaving yourself lots of space and avoiding putting extreme amounts of heat into them (like holding a constant brake application over a long downhill grade) until they have seen a few normal heat cycles should be fine. Normal driving should season the rotors and bed the pads into the rotor surfaces relatively quickly.

When your Jeep came off the assembly line with its brand new parts, it was probably moved around plenty with several starts and stops before getting to the dealer...throw in being moved around on the dealer's lot, and a few test drives before it got to the owner- I'll bet no break-in procedure was used on the original brakes with no resulting disaster. Using the wrong braking techniques can mess up a brand new set of rotors or a well-used but still serviceable set. Avoiding unnecessary panic stops or excess heat combined with a common sense driving style will help the brakes last as long as they should.
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Old 11-26-2019, 05:47 PM   #4
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It appears the instructions with the PADs called out their Break in procedure - approaching a STOP try not to sit holding pressure on the brakes.. you might even use the parking brake to hold the vehicle if for an extended time; and as I recall the Powerstop's I used said drive for 5 minutes w/o braking after the required 40-10 / 35-5 hard stops and that was when to avoid stopping and holding the brake.

Also, the A/M auto parts store pad do not require break in & the MOPAR do not requrire breakin either. (I have used them both on multiple vehicles multiple times.)
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Old 11-27-2019, 08:59 AM   #5
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Originally Posted by mannaggia View Post
I've never replaced my own brake pads & rotors before, but my son and I are going to give it a shot this weekend.

I've read the instructions and watched videos about breaking in the brakes - go out on an open road and do the 40 mph down to 10 mph five times without coming to a full stop, because a full stop will create some sort of spot on the rotors.

My question is... what if I have to come to a full stop GETTING to the road where I can take it up to 40 mph five times? Won't that screw it up?
My advice is to leave plenty of space and creep up to the full stop, avoiding it if you can. If you brake gently and slowly before you bed the pads in, the rotor is not going to get hot enough for a full stop to cause a problem.

They suggest not coming to a full stop immediately after the bed in process because at that point the rotors are already hot and if you come to a full stop that is when you can create a hot spot in the rotor. It's much more important to avoid this after the bed in process than before.
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Old 11-27-2019, 09:37 AM   #6
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Old 11-28-2019, 08:39 AM   #7
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I've been doing my own brake jobs since I've been about 18, 54 now. I NEVER performed any type of "break in procedures" and never had a problem. Only nagging problem I ever had was a brake hose went bad on our JKUR, which in turn took out a couple of sets of brakes and rotors on the front passenger side. Replaced the hose with a MOPAR replacement (did both on the front) and no issues. Next time I do the rears gonna replace the rears with MOPAR hoses.

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