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Still hard of seeing from Kent, UK. Some good write ups on the brakes. Thankyou very much everyone. My next question is do I/should I go for grooved or drilled discs or both? What are the pros and cons for either?

Pip
1999 M5 (Too poor to afford a post 2000 one!!):3:
 

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Drilled rotors are for looks. It's the Porsche look. Grooved rotors (it depends a little on how the grooves are oriented) are better for serious performance applications. Either grooves or drilled holes are better than flat rotor surfaces, in terms of facilitating removal of gas created by pad wear during hard braking and water during rain driving.

One of the reasons for the above preference for grooved rotors is that grooved rotors are less susceptible to crack propagation and catastrophic failure of the rotor. Note that all rotors subjected to track levels of braking heat stress will develop surface cracks and will need to be replaced once cracks become prominent (the fingernail test).

For the street, pick what you think looks best.

Regards, Dick Roberts
 
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