Brake Bedding question

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Apr 29, 2011 | 09:44 AM

ssdeuce

Thread Starter

Burning Brakes

Joined: Oct 2007

Posts: 1,249

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From: Harriman Tennessee

Brake Bedding question

So I put new pads and rotors on bedded my brakes and cracked a rotor in the process

so my question is do I need to bed my pads in again after I replace the rotor?

Thanks!

Apr 29, 2011 | 11:32 AM

Gordy M

Melting Slicks

Joined: Feb 2001

Posts: 2,797

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From: Northville, MI

I was always told to bed the rotors with the old pads and then put in the new pads to continue the bedding process. Even then its a drive slow and gradually apply new bad material in the rotors, then some medium braking and finally start applying the brakes hard 4 or 5 time change pads and do it again.

Apr 29, 2011 | 01:47 PM

Liquid1

Instructor

Joined: Feb 2010

Posts: 151

Likes: 1

From: MA

Here's a very helpful article, with links to more related content at the end.

http://www.stoptech.com/tech_info/wp_bedintheory.shtml
http://www.stoptech.com/tech_info/wp_bedinstock.shtml

Apr 29, 2011 | 02:06 PM

torque*is*cheap

Instructor

Joined: Jan 2011

Posts: 175

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Definitely...you want to transfer some pad materials to the rotors' friction surfaces. I like to do about five hard stops from about 80 mph to 30 mph...preferably at night on a deserted road!

Apr 29, 2011 | 02:57 PM

JRitt@essex

Supporting Vendor

Joined: Oct 2009

Posts: 1,835

Likes: 509

From: Charlotte NC

Yes, you should do another bed-in. Here is a video and article I did on bedding in brakes (give it a minute to load, it is a substantial vid in high def). I discuss the theory, so it should be clear as to why you need to re-bed after watching it. Thanks.

Apr 29, 2011 | 06:21 PM

Bill Dearborn

Tech Contributor

Joined: Oct 1999

Posts: 41,013

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From: Charlotte, NC (formerly Endicott, NY)

Have cracked many a rotor at HPDEs. I change the rotor and then go out and take it easy (.7 or .8) for 2 or 3 laps slowly working my way back up to speed.

Bill

May 1, 2011 | 09:57 PM

RaleighSS

Drifting

Joined: Jun 2005

Posts: 1,681

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From: Seven Devils NC

I have never herd of cracking a rotor in the bedding process .....

May 1, 2011 | 10:32 PM

KNSBrakes

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Joined: Jul 2007

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From: Raleigh NC

Quote:

Originally Posted by ssdeuce

So I put new pads and rotors on bedded my brakes and cracked a rotor in the process

so my question is do I need to bed my pads in again after I replace the rotor?

Thanks!

Kinda funny....

You may have went a bit overboard. But more likely it was the thermal shock to a new casting. With cast iron - especially the cheap stuff that most rotors are made from now...

-Warm it up slow - then keep it hot once it.s hot - and try to cool it evenly.

-Lesser heat cycles when new to slowly heat treat it.

It hates temperature differential, rapid temperature change or uneven heating.