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Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit
  • Hi Spec - BMW E30 325mm Billet 4 Conversion Kit

Hi Spec - BMW E30 325mm Billet 4 Conversion Kit

Prod Code: HI8AQ9L163

Aluminium Bell Colour:

Brake Caliper Colour:

Brake Disc Style:

Brake Hose Applications:

Brake Pad Applications:


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01159 893 488
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Delivery Costs

The £14.99 delivery charge is a flat rate which we charge to all order to the UK Mainland. This applies to any number of items and will increase for international orders.

Delivery Times

Each product on our website has its own estimated delivery time. This will depend if the product is a stocked main item, if its imported or if it’s a custom hand made product that has options and extras which can take more time to complete.

Fast deliveries and deadlines

If you need to know if the brakes or products can be delivered for a certain date please contact us. If you are on a tight deadline for a show, a magazine feature, your car is booked into a garage or any other reason then please contact us first before ordering your products on-line as once the products are put into production cancellation fees may apply.

For further delivery information:

Please check our delivery information page for further details regarding our delivery policies. We are happy to answer any questions you may have regarding stock and custom items.

Direct replacement kits: All the big brake conversion kits we retail are direct bolt on replacement kits. This means that modifications are not required to the vehicle to fit the new calipers, rotors and parts. The kits are supplied with vehicle specific caliper brackets which aid in fitment. 

How long should it take to fit each kit? We estimate that 1 hour per side should be more than enough time to complete a fitment. Once you have removed the original OEM parts, the new parts will bolt straight on in their place providing your upgraded braking power. 

Sorry, finance is not available on this product

Hi Spec - BMW E30 325mm Billet 4 Conversion Kit

Information:  This Hi Spec Motorsport Billet 4 conversion kit will fit your BMW E30. For small to medium weight road cars, a Hi Spec Billet 4 Conversion is the ideal kit. With disc sizes ranging from 280mm to 325mm giving increased leverage, higher rotation speed of the disc relative to the pad and more surface area to assist with heat dissipation when compared with standard set ups.

Pricing: Product pricing is for a 1 complete Hi Spec kit, (both front hubs).

What does a full conversion kit do? This full kit combines a Billet-4. 4-pot alloy caliper with large two-piece discs to give a significant increase in stopping power. The improved stopping power of the calipers join forces with the greater leverage and heat dissipation properties to take braking performance into another league.

Fitting these alloy calipers and light weight one or two-piece discs has the added benefit of reducing unsprung weight. This is more important than just losing weight from the car. Losing unsprung weight means better handling and response from dampers.

What is a Billet-4. caliper? As its name suggests the Billet-4. caliper is CNC machined from aerospace grade billet aluminium. The result is a super-rigid caliper with almost no flex, (a common problem with other alloy calipers). The Billet-4. features integral dust seals, internal fluid transfer galleries and a fully anodised finish in a choice of three colours.

Kit Content: This kit includes the following parts:

  • 2 x Billet 4 Radial Calipers
  • 2 x Aluminium Bells
  • 2 x Straight Vane Rotors
  • 2 x Brackets
  • 1 x Rotor/Bell Hardware Pack
  • 1 x Bracket Hardware Pack
  • 1 x EBC Standard Road Pads (Upgradeable) 
  • 1 x Dot 5.1 Brake Fluid
  • 2 x Braided Hoses (Optional)

Wheel clearance: Before ordering please check your wheel clearances. HiSpec calipers are wider than the standard sliding caliper, therefore we cannot guarantee fitment for every wheel on the market.  You can check your clearances by clicking the wheel clearance diagram above.  The wheel size listed is for the standard wheel.

HiSpec brakes: For more information regarding HiSpec brakes and their background, please follow this link to our dedicated HiSpec Motorsport article.

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