Squealing Brakes - Reply From Pagid
 

My brakes on my Cayenne squeal terribly. I send an email to TMD Friction, the company that makes Padid pads to see if they made a pad that would solve the problem. I was surprised to receive such a thorough reply even though they could not solve the problem by just getting a different pad. Thought others may be interested in their reply.

Good morning Duffy,

Unfortunate to hear about your brake system making noise. Since the car is a 2011 model, has the dealer attempted to address your complaint? If so what was their response?

Pagid and Textar are the factory brake pads on all Cayenne’s and do to the size of the Cayenne Turbo brake system it will be difficult to find anything in an aftermarket brand.
The warranty return rate on these brake pads are some of the lowest in our company.

A possible reason for the brake noise could be the brake rotors are glazed over or the brake pads. This is caused if the brake pads were not correctly bedded in.
I would suggest to have the dealer replace the brake rotors and pads and follow the correct bedding in procedure which I have attached for your reference.

Best regards,

Patrick Natorp

Here is the attachment both copy and pasted here and as an attachment in case anybody wants to print it.


BRAKE PAD BEDDING IN PROCEDURE


New brake pads have to be bedded in upon installation. Correct bedding guarantees that new brake pads and new rotors work flawlessly together. In order to function optimally, organic brake pads must develop friction coal on its surface. This friction coal develops at a temperature of about 280 degrees C (537F). It is very important that this temperature is reached continuously and slowly. This process results that the temperature not only is penetrating the surface of the brake discs and pads, but also evenly through the whole disc and pad material. This is essential when using new brake discs, since the disc often shows signs of strains (due to the casting process and fast cooling) in the materials. A steady and careful warming and cooling process guarantees a good release of both materials.

The bedding in/brake in procedure should be done as follows:
Drive at around 35 mph (60 kmh) about 500 – 800 yards (solid discs about 500 yards, vented discs 750 yards) with slightly dragging brakes (a.k.a. light brake pedal pressure) (brake pressure < 5 bar). This process allows the brake temperature to slowly and evenly build up to 300 degrees C (572F).
Now if possible drive about 2200 yards maintaining same speed without braking to allow the pads and discs to evenly cool down. At the end perform a regular brake application from 35 mph to 0. However, no Panic Stop.
Now the friction surface evenly developed friction coal, the pads bonded with the disc surface, and tensions in the disc materials disappeared.
Only trained master mechanics should perform this procedure – not the car owner.
This bedding process is only suitable for the front axle not the rear.
This is related to the brake distribution of front and rear axles. In order to reach 300 degrees C (527 F) on the rear pads you would have to drive several miles with dragging brakes. However, at that time on the front axles you will have glowing red, hot discs thus destroying the front brakes.
Final note – please never forget to clean hubs and check wheel bearings. Also the brake fluid should be replaced at least every 2 years.

Can you bed them if you've put 1000 miles already and there are noisy from Day 1?

Sorry, but their reply is crap. Replacing the pads/rotors isn't going to fix a bedding problem. They bed within the first few hundred miles. The problem is simply brake pad dust. You're not going to get a "bad bed" or anything like that ever. The pads float, and the rotors are fixed. However they mate together is how they mate together. It's impossible that somehow the pads or rotors are bad and causing the noise unless the pads and/or rotors themselves are "bad" in some way. That would be the only possible reason the "bedding" didn't work. Otherwise, if the parts are good, that's just the way it is.