Due to the sheer size and interest in this thread (and my thanks to all involved) I have edited this first post to become a summary and index to all that has been discussed, tested and debated here. The original first post I made is quoted below and if this is your first visit here, welcome, and please read all of this post and follow the links first, as you may well find your question answered. Regards Scaff Summary As the original post above explains the main reason for this thread being written was to dismiss common misconceptions regarding braking, initially in GT4, but this has naturally expanded to cover real world applications. A fine starting point (and to save reading the entire thread) is Skant's excellent summary of the entire threads main points. Skant's summary Why weight is not a significant factor in braking distance and weight transfer is far more important (but neither is as important as your tyres) This is without a doubt the single most widly discussed subject on this thread and you will find the main debate and points covered between pages 5 and 9. Please be aware that the statement above is true and before you wish to question it, read ALL of the related threads and linked details. The true benifits of bigger discs and better pads Again a good discusion was had with regard to this subject, another common misconception that bigger discs and better pads will stop you quicker (not true - as long as your current brakes are up to the job). This has been well covered in these posts:Post 1 and Post 2 Threshold Braking A lot of people have asked what this term means, and to save searching, here is a definition. Threshold Braking ABS What is ABS and how does it work, find all you need to know in this excellent little summary. ABS Compression Braking What is Compression (engine) braking, how does it affect a car and why its application on the road and track are very different. Compression Braking Colin Chapman on Engine Braking - supplied by Alfaholic Setting Brake Bias A quick look at how to set brake bias in GT4 The Brake Balance Controller GT4 Brake Tests A number of regulars to this thread have taken the time to conduct a number of very detailed braking tests, some are designed to test GT4 physics vs the real world and some as just to prove a point. All are useful and of great interest, I hope you agree. FIDO69's First test Lazydog's First test Racing Brakes - Test 1 Racing Brakes - Test 2 ABS Threshold Vs Cadence braking ABS - Tsukuba Wet Ford GT 0 - 100 - 0 - The real world vs. GT4 GT4 Vs Autocar 0-100-0 test database GT4 Compression/Engine braking How long is an ml in the data logger (and Ford GT 70-0mph test) AM V8 Vantage - Brake Balance Controller - Settings test Weight Reduction Vs Tyres - which is better for braking Pagani Zonda 0 - 100 - 0 - The Real World vs GT4 Racing Brakes - A test with racing tyres TCS & Braking - any effect? I hope that we will be able to continue testing the GT4 braking physics and expect to see more tests linked here in the future. Links A series of links that you may find useful, while most refer to real world braking systems and physics, a lot does apply directly to GT4. Braking Systems - In plain english (an excellent starting place) ABS and Big Brake Kits The First Step for Improving Vehicle Dynamics: TIRES Improved Handling with Anti-Sway Bars Autocar 0 - 100 - 0 test 2002 Autocar 0 - 100 - 0 test 2003 Autocar 0 - 100 - 0 test 2004 Autocar 0 - 100 - 0 test 2005 Autocar 0 - 100 - 0 test 2006 Brembo Brakes FAQ Autocar 1999 Tyre test The Physics of Racing StopTech White Papers - All of them ART Chassis Tuning Toe, Caster and Camber Gearing calculations Recomended Reading Speed Secrets (Professional Race Driving Techniques) by Ross Bentley - ISBN 0-7603-0518-8 Going Faster (Mastering the art of Race Driving) by The Skip Barber Racing School - ISBN 0-8376-0226-2 The Anatomy of the Car by Jeff Daniels - ISBN 1-8536-1133-6 (This may be out of print) Race & Rally Car Source Book by Allen Staniforth - ISBN 1-8596-0846-9 In closing I hope that you find this thread useful and enjoyable, and if you do feel compelled to post, please do so, we are a friendly bunch and always keen to help.