CALIPER ALLOY BLACK 4 POT FOR 7.5"DISC WITH S/STEE...
C-AJJ4023

£391.43 exc vat

£469.72 inc vat

Out of stockOut of stock
Pair of 4-pot alloy calipers for 7.5" diameter brake discs with 10" wheels. Kit includes pad retaining pins, but not brake pads. As used on Peter Baldwins mini

miglia challenge winning car for 3 years

Note: uses Metro pads which have to be modified by cutting/filing off a small corner part of the metal on two pads. This does not impair the quality of this fitment.


The advantage of alloy calipers is that they dissipate heat quicker, reducing fluid boiling. The design also helps to expel pad dust and heat from the contact area. The 4 pot design provides a much more uniform pressure and far superior braking by virtue of 2 pistons each pushing against the pad, increasing pad contact and brake efficiency.

For vented discs you will have to machine down the 8.4 disc or purchase GBD497 but this will cut most of the vented part away and may not greatly improve the breaking efficiency much more, using vented discs will require drive flanges NAM6450F and a spacer kit C-AJJ4021 for increasing width of calipers. Please state if being used for vented discs.



Another Quality feature of the Minispares Calipers is that they are fitted with 2 larger bleed screws for ease of bleeding when servicing, we have noted other competitors calipers which only have the one small bleed screw become corroded, seized and break off causing much inconvenience.



Please ensure all the old brake fluid is removed from the system before fitting the new calipers as this prevents any bits in the old contaminated brake fluid from becoming lodged under the bleed nipples which could cause obvious problems.



the C-AJJ4023 calipers will fit under the minispares C-21A1071 rose petal wheel, but only when used with solid discs. they will not fit if the calipers are used with vented brakes

£391.43 exc vat

£469.72 inc vat

Out of stockOut of stock

Recommended products

Carbon metallic pads for 4 piston calipers.

These require special bedding in and fitting intructions are available if new to this type of pad for racing.

Mintex MRM1802 (formerly M1144) pads for Metro Turbo calipers. Competition only pads, not for road use.

A set of split pins and metal retaining clips are available as GBK1025

Granville DOT 4 brake and clutch fluid 1LTR.

Kit to fit alloy calipers C-AJJ 4022 or 4023 when converting Minispares 4 pot calipers for vented discs. Contains 4 spacers, seals. Longer bolts and correct brake pad retaining pins. The brake disc will require machining down from 8.4" to 7.5" for us...

Used on all 4 pot alloy calipers as well as standard fitment for Metros.

A set of split pins and metal retaining clips are available as GBK1025

3.300"wide

7.5" Vented brake disc, suitable for use with our vented alloy 4 pot calipers (C-AJJ4023 together with C-AJJ4021). These are sold individually but should always be replaced in pairs. These are in fact 8.4" vented discs machined down

to 7.5" ...

For use with 4 pot calipers as per Metro or Minispares own alloy type these are our favourite road brake pads as the reduce contamination on alloy wheels by virtue of less brake pad dust, plus they work well with good anti fade properties. A set of s...

Kit products

Full 7.5" brake disc conversion with 4 pot alloy calipers.

No matter how well your Mini handles, you still have to stop sometime, and if the car in front of you has ABS you'd better be able to stop right now! At one time the only way to get ...

12" wheel to 10" wheel running gear conversion kit. Less wheels.

This kit will convert your 8.4 disc set up to the Cooper S 7.5 discs to allow fitment of 10" wheels, kit includes discs, 4 pot aluminium calipers, kevlar pads with split pins a...

Kit contained products

Pack of 4 pins, always required when changing pads--on 8.4 size brake discs as fitted from 1984 onwards. For kit with retainer clips see GBK1026. See GBK1025 for vented discs.

The pins also fit the Austin 1100/1300 ...

Special washer for the caliper retaining bolts on Mini Spares alloy calipers.

3/8" high tensile Bolt but 3/16" longer at 1.5" long for use on our 7.5" 4 pot alloy calipers or any other usage when longer bolts are required for mounting the calipers to the hubs. With correct length shank. The ERA turbo used Metro 4 pot calipers ...

People also bought products

Cooper S 7.5" complete brake disc kit, except for disc shields, with Mini Spares own cast standard calipers. If you want or have 10" wheels this is the kit to convert from drum brakes to discs brakes.

This kit includes every nut bolt and co...

PRICED INDIVIDUALLY per disc but should always be fittted in pairs for safety and efficiency..

THERE IS AN ALTERNATIVE GROOVED AND DRILLED PAIR OF DISCS SOLD AS C-GBD496.

High tensile 3/8" bolt 1.3125" long, to hold the standard calipers to the hub on disc brake models. Correct length shank and material. T grade 62 ton rating with vickers 287 reading-25-32 rockwell. The ERA turbo used Metro 4 pot calipers and used spe...

Kit to fit alloy calipers C-AJJ 4022 or 4023 when converting Minispares 4 pot calipers for vented discs. Contains 4 spacers, seals. Longer bolts and correct brake pad retaining pins. The brake disc will require machining down from 8.4" to 7.5" for us...

Genuine Lockheed seal rebuild kit for Cooper S brake calipers. One kit needed per caliper. When it comes to safety critical parts, only fit the original suppliers' parts as repair kits. The kit includes all the seals needed to do both pistons in one ...

Genuine oil seal between the two halves of the original cooper S caliper

and is only supplied by Rover. AP suggest you should buy the bolts to hold the 2 halves together as well when undertaking this repair, see 17H8765. Sold si...

Stainless steel "S" caliper piston for calipers that take 7.5"wide brake disc as used on all Cooper "S"variants and early 1275GT. These are correctly ground for long life and fitment against the seals,but nore importantly have the raised crown sectio...

Correct size and length brake pad pin for the caliper using 8.4" disc size and vented calipers.

For use on 8.4" wide standard brake disc calipers, 2.920"wide.

This is the Ultimax upgrade which produces less brake dust which destroys alloy wheels. For the upgraded version of this see C-AHT16GREEN.

A set of split pins are availa...

A great street upgrade for 4 pot calipers giving off less brake dust and better efficiency.A set of split pins and metal retaining clips are available as GBK1025

Our favourite pads as the give less brake pad dust which destroys alloy wheels.

Very durable and great for most road usage. The green upgrade for fast street is C-8G8995GREEN.

For Cooper S 7.5" wide discs these are our favourite road brake pads as the reduce contamination on alloy wheels by virtue of less brake pad dust, plus they work well with good anti fade properties.

For use with 4 pot calipers as per Metro or Minispares own alloy type these are our favourite road brake pads as the reduce contamination on alloy wheels by virtue of less brake pad dust, plus they work well with good anti fade properties. A set of s...

7.5" Vented brake disc, suitable for use with our vented alloy 4 pot calipers (C-AJJ4023 together with C-AJJ4021). These are sold individually but should always be replaced in pairs. These are in fact 8.4" vented discs machined down

to 7.5" ...

A pair of 7.5" brake discs and one set of Kevlar road brake pads.

Adjustable original brake proportioning/balancing valve for racers only.

The most common brake system on the Mini has Disc brakes in the front and drums in the rear. The weight bias on the car is all in the front and thus under hard braking...

Used on all 4 pot alloy calipers as well as standard fitment for Metros.

A set of split pins and metal retaining clips are available as GBK1025

3.300"wide

From 1989 minis which have the brake servo built into the master cylinder and it is very difficult to work in the engine bay, especialy clutch changes because of the extra room taken up by this dual cylinder. By replacing the 2 metal brake pipes from...

This stainles steel caliper piston fits all Minispares 4 pot calipers plus Metro and ERA turbo 4 pot calipers.