JCW 4 pot BREMBO with BMW M3 brake discs
#1
JCW 4 pot BREMBO with BMW M3 brake discs
R56 JCW Brembo calipers are the most beautiful among all R56/F56 MINI calipers for my taste. Their main downside is narrow OE 316x22 mm (12.44”x0.86”) brake discs. The OE discs’ ability to dissipate heat is limited by the narrow ventilation air gap. At the same time R56 Brembo calipers have right brake pads. The pads provide wide friction track (55,6 mm) on the discs and thus substantially bigger disc friction surface than the majority of aftermarket BBK for MINI, even with bigger diameter discs. People usually buy the diameter of the discs as it is the most visible and understandable discs’ characteristic. Not all people even pay attention to the width of the discs. And very few people pay attention to other also very important parameters. One of the most underestimated parameters is the size of friction surface/annulus of the discs. The bigger the surface is the lower its peak temperature is during extreme hard braking from high speed. Heat has some time lag in spreading throughout the internals of the discs – that’s why big friction surface is important. Thus OE calipers and pads have very good potential. To unlock this potential JCW calipers need discs that can not only absorb high volume of energy but also dissipate it quickly to be ready for the next hard braking.
The most cost-effective upgrade for JCW Brembo calipers is to pair them with 315x28 mm (12.4”x1.1”) BMW M3 E36 discs. The disks have curved directional vanes and 13.5-13.75 mm air gap, they are cheap (at least one-piece) and easy to buy. They are light – 7,4-7,7 kg for one-piece, two-piece discs weigh about 7 kg. JCW 316x22 discs weigh 7,4-7,5 kg. The drilled one-piece Zimmermann is lighter (7,4 kg) than other one-piece discs. It has a bit wider air gap (13.75 instead of 13.5 mm) and wider air intake.
To place BMW discs on the hubs I use 7.5 mm steel spacers. The weight of each steel spacer is 0.35-0.5 kg. The spacers with open windows are lighter and provide ventilation of the hubs. I prefer galvanized steel brake disc spacers since they provide better heat protection of the hubs and they are more durable and predictable than aluminium spacers. The weight difference between aluminium and steel spacers is minimal. This weight is concentrated near the centre of rotating mass and its influence on dynamics is negligible.
To work with 28 mm discs the calipers require 6 mm insets, additional seals and longer high-strength screws. Two screws are enough for one caliper. Two OE screws can be reused. The modification of pad springs is also required – they should be 6 mm wider.
The caliper gets 6 mm wider and the brake disk spacer is 7.5 mm wide. So no wheel spacers are needed. The wheels are centered on the hubs. JCW calipers are very tolerant to X-factor of the wheels. Usually big brake kits with 28 mm wide discs require big wheel spacers.
BMW M3 brake discs 315x28
316x22 vs 315x28
7.4kg vs 7.7kg
Wide air intake
Standard air intake
Brake disc spacer
Vented brake disc spacer
Brake pad springs
The most cost-effective upgrade for JCW Brembo calipers is to pair them with 315x28 mm (12.4”x1.1”) BMW M3 E36 discs. The disks have curved directional vanes and 13.5-13.75 mm air gap, they are cheap (at least one-piece) and easy to buy. They are light – 7,4-7,7 kg for one-piece, two-piece discs weigh about 7 kg. JCW 316x22 discs weigh 7,4-7,5 kg. The drilled one-piece Zimmermann is lighter (7,4 kg) than other one-piece discs. It has a bit wider air gap (13.75 instead of 13.5 mm) and wider air intake.
To place BMW discs on the hubs I use 7.5 mm steel spacers. The weight of each steel spacer is 0.35-0.5 kg. The spacers with open windows are lighter and provide ventilation of the hubs. I prefer galvanized steel brake disc spacers since they provide better heat protection of the hubs and they are more durable and predictable than aluminium spacers. The weight difference between aluminium and steel spacers is minimal. This weight is concentrated near the centre of rotating mass and its influence on dynamics is negligible.
To work with 28 mm discs the calipers require 6 mm insets, additional seals and longer high-strength screws. Two screws are enough for one caliper. Two OE screws can be reused. The modification of pad springs is also required – they should be 6 mm wider.
The caliper gets 6 mm wider and the brake disk spacer is 7.5 mm wide. So no wheel spacers are needed. The wheels are centered on the hubs. JCW calipers are very tolerant to X-factor of the wheels. Usually big brake kits with 28 mm wide discs require big wheel spacers.
BMW M3 brake discs 315x28
316x22 vs 315x28
7.4kg vs 7.7kg
Wide air intake
Standard air intake
Brake disc spacer
Vented brake disc spacer
Brake pad springs
Last edited by cooper a; 03-26-2017 at 08:19 AM.
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