Group ND Proposal

Braking system must remain as original ie Drum-Drum, Disc-Drum or Disc-Disc

Brake modifications are restricted as follows:-

• Disc rotors, drums and hydraulic cylinders may be dimensionally changed.
• Calipers may be changed but with no more than 4 pistons on front and 2 pistons on rear and no water cooling. Calipers must remain of period style and appearance.
• Handbrake systems are free,
• Brake discs must retain period appearance with either slots or thru-holes, but not both, and no J hook surfaces.
• Any 2 piece brake discs must have a rigid mounting system between the rubbing face and the mounting hat,
• Brake pedals may be changed in detail but their location in the bodywork must remain.
• Brake air ducting is permitted provided no new intakes are cut in body panels or any moulded plastic front bumper

Any hydraulic or electronic components associated solely with operation of Anti-lock braking systems, are free.

Note: The size of the disk or drum assembly that can be used will be limited by the rim size. 

Justification and Rationale

The proposed Nd requirements aim to find a sensible balance between cost to purchase and maintain, improved braking performance and period appearance. 

In this PERIOD, braking systems became much more complex with the advent of dual circuit master cylinders, ABS and 4-wheel discs and this can make repair and/or modification complicated.

In some cases, an ABS system cannot be effectively modified for competition use and/or its control devices repaired.

Allowing this package of freedoms improves safety by allowing competitors to choose the best system that will fit under the wheels

Retaining a period appearance for calipers and disks will not adversely impact the overall look of the vehicle.