Standard new disks and pads

[leorest]

Quick question
Just had new disks and pads fitted to the Mundano. (All standard Ford bits)
Do they need beding in? If so how?
What's the down side to not doing it?
Leo

[nords]

Bed them in by going fast on a straight road and brake reasonably hard down to 10 mph and then pick up speed to cool them off. You want to get them evenly hot around the disc (by braking, accelerating, braking etc) and then at the end of doing this cool them gently as you drive normally home. You are altering the structure of the metal in the discs to make it stronger, by this heating cycle process.

Don't do it and they will take longer to do this and not work as well as normal until done. The other risk is that working them hard without doing this will cause hot spots which turn into differing patches of 'friction' for want of a better phrase. This will give you judder as the pads slip and then grip and then slip (for a constant pedal pressure) and is the thing normally known as 'warping the discs'. Actually making the discs go out of tolerence (real warping) takes some doing, it is the first process which is far more common, and is solved by a garage skimming the discs.

Best to do it!

[leorest]

nords said:

...This will give you judder as the pads slip and then grip and then slip...

Dead on the money! My last set of disks wern't beded in and started to judder (after 20Kish)with moderate breaking pressure at high speed.
Thanks
Leo