MM-BBK - Maruha Motors 4-pot caliper front big brake kit


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Part #: MM-BBK
Notes: THIS ITEM IS A SPECIAL ORDER FROM JAPAN
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Please contact us for pricing & more information.

All Fitments

MAZDA
Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
1989 - 2005 MIATA ALL ALL ALL ALL ALL ALL

Product Description

Maruha Motors 4-pot caliper front big brake kit features:

1. Features of the genuine Miata caliper

We will explain you how the stock caliper works.

The stock caliper sandwiches a rotor in between a single piston on one side and the bracket on the other. Pushing the brake pedal causes the oil pressure towards the caliper piston. The caliper body tends to move outside the car against the pressure.

This repulsion against the oil pressure forces the caliper to slide, in other words, the brake pads in the caliper sandwich the rotor. The stuck rust on the slide pin interrupts the caliper from sliding smoothly. This is a possibility of trouble such as a brake pad rubbing.

Caliper piston sizes are all the same for all Miata model years.

However, the rotor diameters are different. NA6CE has a 234mm and NA8C/NB (excluding NB8 with a 270mm disk) have 252mm rotor disks.

2. Features of Maruha 4-Pot Caliper

Maruha’s caliper body with billet aluminum is much lighter than the genuine ones.
The body housing forging brings our caliper the refined design and the enough stiffness.

The stainless steel piston, works as one of the important functions in the caliper, has rust resistance and can prevent heat from transferring to the fluid. The main feature of our 4 pot caliper is to brake by using the rotor effectively.

A reinforced brake system puts a rotor rim between brake pads. As a single piston diameter becomes larger, the width of the rotor that the pads sandwich turns wider because the single piston tends to push the center of the rotor more than calipers with multiple pistons.

Furthermore, the wider the rotor hits against the brake pad, the easier it results in uneven pad wear. Not only do single pistons have drawbacks, the more pistons calipers have, the more difference in friction coefficient between the pads the rotor in and out have.

Generally, the rotor-in side causes more friction against the pad than the rotor-out side. Different diameter pistons have more friction to the rotor-out. Friction against the rotor in and out sides. Maruha 4 pot calipers are designed to decrease friction.

The caliper makes a great pedal feeling without interfering with the master cylinder as suitably small-sized pistons are used for our product. Moreover, the NB8 after M/C rotor included in the caliper kit is large enough to sandwich the brake pads effectively between the outer rims.

Although there are many users who use 14 inch wheels, larger-sized rotors have advantages to make the brakes perform better. You can prevent the brake pads from the overheat condition and the damages by using large sized rotors whose rims work effectively.

Small rotors, controlled by the pads with high friction and the calipers barely pushing the rotors, are not recommended you use.

3. Why is the NB8 rotor adopted?
It costs less to be supplied the NB8 rotor, whose diameter is 270mm and is large enough to be installed into the Miata as it is a genuine product.

In addition to this, Mazda supplies the rotors steadily and we can provide our customers with them without stock shortages or overstocks.

The NB8 rotor frees us from the necessity to develop two-piece rotors because the genuine product is suitable to be used in every Miata.

The rotor keeps you from worries about the interference with the hub and about the matches with the wheels installed in your car presently.

4. Solid line-up of front brake pads
Don’t you worry whether you have a choice of brake pads for Maruha 4 pot calipers. A large variety of products are available.

a) MARUHA ORIGINAL
• CA-27

b) HAWK
• HPS-High Performance Street
• HP Plus/Autocross

c) Performance Friction (PFC)
• PFC 80 Compound
• PFC 83 Compound
• PFC 93 Compound

d) Endless
• Type CC-R
• Type CC-X

5. Pad settings for daily street driving
It is considered that a lot of customers use Maruha 4-Pot Caliper in daily driving, though it is originally released for circuit. Everyone may have an experience that you drive with radial tires in rain.

It is dangerous to use brake pads with a high friction factor in rainy day. They make the tires locked up easily due to the brake system whose performance has been increasing recently.

In order to avoid the danger, HAWK HPS is adopted as the pad included in our caliper kit.
We are convinced that the HAWK pad is easy to be handled on street with its long life and mild braking.

Furthermore, you can support the brake pads steadily with the hollow fittings and the back plates that Maruha 4 pot calipers contain. Our product prevents your brake system from odd sounds caused by the brake pads.

6. Keep on using your wheel

Is your wheel installed now suited for the Miata and does it have a diameter of 15 inch, 7 inch J with +35 or less offset?

If so, almost all the wheels are acceptable to be installed with Maruha 4-pot calipers. However, it is true that some wheels are unsuitable for our caliper body. To confirm whether your wheel fits the caliper, please feel free to contact us.

7. Separate sale: Mazda Speed slit rotor

You can get Mazda Speed slotted rotor as an optional kit. A slotted rotor helps brake pad dust to be removed from the rotor surface, releasing gas caused by the high heat pad.

All pads make dust. When the rotors without slots have dust on the surface, the pad abrasive allows it to be wiped away.

In severe conditions such as race driving, the brake system is under hard circumstances.
The slit rotor has an advantage to maintain the brake performance. It cleans the rotor surface efficiently by removing dust through the slit grooves.

If you brake frequently, the brake heat forces a pad lubricant to turn gas. It makes the rotor slide against the pad. As the result of it, the heated rotor disk moves relentlessly like a hot knife though butter. This situation brings brake fade.

A slit rotor is designed as a reinforced disk to avoid brake fade, though it is said that the performance is changed by the differences of the width, depth, design, numbers of the groove and so on.

The more slits rotor disks have, the faster brake pads are worn out. It is possible that the slit rotor causes judder and we cannot recommend the street drivers to use it. The slit rotor works efficiently in circuit.

8. Components

We arrange the ideal kit and offer Maruha 4-pot calipers to our customers with reasonable prices. Why don’t you search “4 pot caliper sale” on the internet? Comparing to the others, it will tell you how affordable our caliper kit is.

A caliper is deeply related with a brake that is a safety device. In order to prevent dangers by bad installation or wrong processes, we urge you to have a pro mechanic set up the caliper kit.

Kit Components:

(1): caliper, rotor, brake line, brake pad
(2), hollow fitting plate, back plate, mounting bracket stay, bolt&washer
(1) A fluid is needed separately.
(2) HAWK HPS is included. Other pads you prefer can replace it. When you buy pads you need, the difference with the HAWK pad is added to the kit price. We also have kinds of pads including Maruha’s original pad. For further information, see Maruha 4 pot caliper details page.

Maruha 4-pot caliper kit rotors options:

• Maruha 4-Pot Caliper Kit with NB8 rotor
• Maruha 4-Pot Caliper Kit with Mazdaspeed slotted rotor
• Maruha 4-Pot Caliper Kit without rotors