bedding brakes?
Thread Starter
Heel & Toe
Joined: Aug 2007
Posts: 22
Likes: 0
bedding brakes?
i just got new rotors and pads on, and my pass front pad seems to be lightly touching the rotor at all time, and it's making a really annoying noise. i tried bedding them, but i've never done it before and i dont know how long i have to do it for. does that even sound like a pad problem, and will i just need to continue bedding them for a while longer?
Burning Brakes
Joined: Apr 2007
Posts: 763
Likes: 1
From: Oceanside Ca
Disc Brake Pads
From what I know, disc brake pads always "touch" the rotor. That is one of the reasons disc brakes work so well, very little mechanical movement to engage the brakes. There are check valves in the system that always sustain a certain pressure so immediate braking is always available.
Team Owner
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sounds like they may be glazed....a few hard stops from 50 or so should fix that...
as for beddding it depends on the manufacturer....may wanna check their site
as for beddding it depends on the manufacturer....may wanna check their site
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
here's a great lnk on brakes...
read the Technical guides especially on bedding theory.
http://www.stoptech.com/tech_info/te...e_papers.shtml
read the Technical guides especially on bedding theory.
http://www.stoptech.com/tech_info/te...e_papers.shtml
Racer
Joined: Jan 2006
Posts: 479
Likes: 2
From: Hollywood Maryland
Check Rotor Lateral Run Out also
If you're going to a brake shop have them check for lateral run out on the rotor. make sure it's within tolerance. Recognized issue with C5s. There's a TSB out on it. Mostly causes pulsating, but should check anyhow while its in the shop.
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Racer
Joined: Apr 2005
Posts: 475
Likes: 1
I have done it on three diff cars
GTP, the Vette and Suzuki SUV:
After install drive and be gentle on brakes (as little as possible and no hard breaking unitl you do the 60-30 series) find road where you can do 60-30 rapid breaking 5-8 times, afterwards drive for another 10 minutes to let brakes cool and you are good to go. No problems on any of my vehicles.
After install drive and be gentle on brakes (as little as possible and no hard breaking unitl you do the 60-30 series) find road where you can do 60-30 rapid breaking 5-8 times, afterwards drive for another 10 minutes to let brakes cool and you are good to go. No problems on any of my vehicles.
Thread Starter
Heel & Toe
Joined: Aug 2007
Posts: 22
Likes: 0
yeah, i think the problem was initially, was when i was leaving the shop there was a lot of stop and go traffic and i had to slam on them from people cutting me off and what not. so...i'm taking it tomorrow. we'll see
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Ok guys, the Idea of being gentle on your brakes was written by lawyers.
Go find a nice quite, low to no traffic straight road. Day light only.
Do 3 to 5 easy 40 to 10 mph stops. ( This puts heat into the rotors and pads) Do them one right after another
next do 3 to 5 HARD 40 to 5 mphs. Hard means stomp on that brake peddle to activate ABS. Almost like doing a motorcycle stoppie, put the nose on the ground.
Next do 3 to 5 HARD 80 to 5 mph stops. again STOMP on that brake peddle.
Then drive aroud for 30 to 50 min too cool the brakes down and put your car away and dont drive it for 24 hours to finish the brake cooling period
No ***** foot stopping. HEAT comes from friction, Heat is used to bed in brake pads to rotors. Bedding of each is the transfer of brake pad material to the rotor.
Hard braking also teachs straight line emergancy braking.
Go find a nice quite, low to no traffic straight road. Day light only.
Do 3 to 5 easy 40 to 10 mph stops. ( This puts heat into the rotors and pads) Do them one right after another
next do 3 to 5 HARD 40 to 5 mphs. Hard means stomp on that brake peddle to activate ABS. Almost like doing a motorcycle stoppie, put the nose on the ground.
Next do 3 to 5 HARD 80 to 5 mph stops. again STOMP on that brake peddle.
Then drive aroud for 30 to 50 min too cool the brakes down and put your car away and dont drive it for 24 hours to finish the brake cooling period
No ***** foot stopping. HEAT comes from friction, Heat is used to bed in brake pads to rotors. Bedding of each is the transfer of brake pad material to the rotor.
Hard braking also teachs straight line emergancy braking.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
This is really not that complicated.
You only need to do 20 consecutive stops from 30 mph. After the pads are installed and your ready to roll, start off go to 30 and apply solid firm brake to a stop, take off again to 30 and bring it to another stop, repeat this until you have done 20 stops. Bring the vehicle to a stop and let the brakes cool down and your good to go.
By the time you have reached about the 18th stop, you will start to smell the pad material heating up and depending on the type of pad installed you may start to experience fading through to the 20th stop. This is normal and expected, also a good time to learn what brake pad fade feels like.
You only need to do 20 consecutive stops from 30 mph. After the pads are installed and your ready to roll, start off go to 30 and apply solid firm brake to a stop, take off again to 30 and bring it to another stop, repeat this until you have done 20 stops. Bring the vehicle to a stop and let the brakes cool down and your good to go.
By the time you have reached about the 18th stop, you will start to smell the pad material heating up and depending on the type of pad installed you may start to experience fading through to the 20th stop. This is normal and expected, also a good time to learn what brake pad fade feels like.
Le Mans Master
Joined: May 2004
Posts: 5,683
Likes: 1
From: Houston Texas
Bedding brake pads is also a good way to find out that you probably need to flush your brake fluid too if you haven't already done so.
Old fluid + heat = pedal to the floor. Lots of fade.
Old fluid + heat = pedal to the floor. Lots of fade.
Thread Starter
Heel & Toe
Joined: Aug 2007
Posts: 22
Likes: 0
ok well i got it back yesterday and it is fixed...finally! anyways he ordered ceramic coated pads, supposedly acdelco's best pads. they're on now and haven't made any noise or anything. the old pads were pitted real bad. MTI refunded my money. i think the rotors produced more heat than the OEM pads could handle.
Melting Slicks
Joined: Jul 2004
Posts: 2,340
Likes: 35
From: Folsom Lake CA
When I was checking my front wheels the other day for a bad bearing I took a real good look at my pads and rotors. To my surprise, I found that there is very little (read NONE) tolerance between where the pad meets the braking surface of the rotors and the rotor "hats". I was shocked beyond belief to see that the edges of the pads actually ride ride up next to the hats, if not touch them slightly. What a lousy design!
With that said, could it be that your new pads actually sit in a way that the edges of the pads slightly exceed the braking surface of the rotors and slightly overlap onto the rotor hats, which are slightly raised compared to the braking surface? If so, the pads' edges are being chafed by the rotor hats, which might explain what you are experiencing - more than normal drag, and even some noise. If that's what's happening, provided the pads are just over the edge onto the rotor hats, I would expect that over a short period of time the edges of the pads will wear off enough that they would no longer "drag" on the hats or make noise.
With that said, could it be that your new pads actually sit in a way that the edges of the pads slightly exceed the braking surface of the rotors and slightly overlap onto the rotor hats, which are slightly raised compared to the braking surface? If so, the pads' edges are being chafed by the rotor hats, which might explain what you are experiencing - more than normal drag, and even some noise. If that's what's happening, provided the pads are just over the edge onto the rotor hats, I would expect that over a short period of time the edges of the pads will wear off enough that they would no longer "drag" on the hats or make noise.