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4 Piston Slim Caliper Kit

4 Piston Slim Caliper Kit

A high performance brake upgrade kit to suit small to medium sized cars using 15-16″ wheels such as the MX5, Celica, Integra and Suzuki Swift. This kit includes the compact and very rigid 4 piston forged caliper with 300x25mm two piece rotors and comes completely ready to bolt on. The SLIM tag refers to the narrow overall installation of this kit allowing a larger range of wheel choices.

Caliper dimensions length: 275.0mm, width: 140.0mm, height: 71.6mm

300mm x 25mm 2 Piece Rotors

Kit includes caliper body, aluminium bracket, brake pad, 2 piece rotor, teflon brake line, pad support spring and complete set of bolts.


Colour options shown above are made to order. Please contact us for enquiries and pricing.

Piston Seals

The design and quality of the piston pressure seals is very important for both brake performance and your safety. Project-Mu calipers have a dual seal arrangement with a dust wiper seal before the pressure seal to prevent any foreign material entering the pressure system.

Differential Bore Design

For calipers using large area brake pads, it is important to have differing sized pistons to ensure even more force is applied along the pad. This in turn prevents the pads from wearing unevenly which can result in a long brake pedal. Special care is taken when designing Project-Mu caliper piston sizes for this reason.

Forged Calipers

Project-Mu racing calipers are designed to provide maximum braking performance in all situations. These are produced from high grade billet aluminium which is the method employed by all leading racing brake manufacturers around the world. The only downside to this method is the high costs involved due to the manufacturing process. Therefore Project-Mu have introduced a new range of calipers to compliment billet racing called ‘Forged Sports’. The manufacturing process (same as forged alloy wheels) involves less time, resulting in lower costs. Still extremely stiff and robust, this caliper range gives the best of both worlds, strength and reliability but at a reduced cost.

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