Help 2nd set of new brake pads squeaking

Z Bear

My wife drives our 2010 370z to and from work with easy highway driving and not much braking. At about 70k miles we developed a very loud squeal from rear brakes. Our mechanic seems to really know his trade and we trust his work and craft. He inspected the brakes and said they were getting close to needing replacement. I gave him the go ahead and asked that he use the Nissan stock pads. He turned the rotors too. We picked the car up and the very next morning when my wife backed out of the garage...the loud squeal was back. It happens every time the car sets for awhile and then is backed up.
I took the car back and our mechanic said he replaced the stock pads with Akebono's. We picked the car up yesterday and we are right back where we started ....still squealing when she is backed up. After eight years of braking, could the rotors metal be changed so that even with turning and new pads they squeal ? Please help ! My wife is embarrassed at work with squeaky brakes when she back out of her parking spot

Spooler

Sounds like a backing plate is rubbing. This is the plate on the back side of the rotor that protects it from debris.

Quicksilvers

+1 Sounds like a backing plate is rubbing. Pretty easy to fix and a common issue with our brakes.

SouthArk370Z

Check the backing plate, as mentioned above. If the shield is OK, go through the brake bedding procedure.

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Z Bear

Thanks guys, I will try those tips and post an update here

Rusty

The pads need bedding. 2 new set of pads and never bedded them.

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Z Bear

Rusty, are you saying you went through two sets of pads like me before you finally eliminated the squeaking by doing the bedding procedure ?

Rusty

Sent you a message. Guess you never read it.

Rusty, thank for you input. When you said "The pads need bedding. 2 new set of pads and never bedded them." Did you mean you had the same problem with two sets of pads before you tried bedding ?

No. You had 2 sets installed. And they was never bedded properly. You need to take the Z out and bed the pads. Find a straight piece of road. Go to about 80 mph. Stomp on the brakes hard. Slow down to about 40 mph. Take the speed back up to 80. And repeat. Do this for about 5 times or until you get brake fade. Once done. Drive around for awhile until the brakes cool off. Don't stop until then. If you do. You will get a pad build up in one spot, and it will feel like a wrapped rotor.

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SouthArk370Z

Definitely this. Most of the "warped rotor" problems I've run into were caused by making a panic stop and staying on the brakes; solved by bedding.

FWIW: For the OEM-spec pads I've installed over the years, 2-3 runs of 60-10 has done the trick. It may take more for hi-performance pads.

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Z Bear

I have been running on the 2nd new set of Pads (Akebono's this time) for about two weeks with the same original squealing when backing. I have not bedded the new pads yet but to those of you that suggested the bedding procedure: Do I need to start with a new freshly turned rotor or is it ok to go thru the bedding procedure now after two weeks (approx. 1500 miles on the new pads) ? The squealing only happens briefly when backing after she sits for awhile and only about 50% of the time. Never squeals going forward and I think it's only coming from the left rear.

Rusty

You bed the pads without turning the rotors. I've done it. You should hear Carbotech XP 10 and XP 8 combo on Racing Brake rotors before bedding. Can you say slowly killing a cat!

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Z Bear

Rusty, could you give me a link where I can hear or view the Carbotech bedding procedure ? I searched Youtube but didn't find it...

SouthArk370Z

Bedding Procedure
1) Find someplace where you can do the following safely.
2) Get car up to about 60 mph.
3) Hit the brakes hard (if ABS doesn't kick in, you're probably not doing it hard enough) and slow to about 10 mph. Do not come to a complete stop.
4) Repeat steps 2 and 3 a few times.
5) Drive around until pads and rotors cool off. Slow speed; no stops; use brakes as little as possible.
6) Done.

Edit: Carbotech bedding procedure

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JARblue

I would add a note that ABS kicking in is a ok reference point on the first bedding cycle. But once the rotors heat up, you really do not want ABS kicking in. You want to brake as hard as you can without triggering ABS. The way ABS pulses the brakes does not help with the bedding process.

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OptionZero

Yeah folks under estimate the effects of bedding to correctly install new pads

I remember my college roommate and I each had S14s. I had the Porterfield R4S (street) and he had the Porterfield R4's (race)

Bedding mine were so much easier.

His required like 10 runs and mine required maybe half. His brakes were basically an on-off switch though. Insane stopping power

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