"Bedding" new brake pads

[Frodo]

Originally Posted by Bobiam

Don't know!!!! I'll look it up on my other PC and attach it soon.

Bob

Hey Bob! What's your definition of "soon"? (I would be interested in reading their recommendations as well.)

[Pat]

Go out and get the brakes as very hot as quickly as possible. Usually for me that means around five or six stops near threshold braking (no ABS) from 90 to 10. Then drive around for ten minutes somewhere you won't have to touch the brake pedal at all.

[Bobiam]

Originally Posted by Frodo

Hey Bob! What's your definition of "soon"? (I would be interested in reading their recommendations as well.)

I'm retired.... "Soon" can be years!

Sorry for forgetting.....Here....

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.