Rear BBK (Big Brake Kit), JHM 300mm (11.8″) for B5 A4-S4

PROUDLY DESIGNED AND BUILT IN THE USA

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Due to popular demand, all of our 2-piece, lightweight rotors will now come with black anodized rotor hats featuring Type 3, hard anodizing, the highest quality and hardest anodizing available for aluminum. This will make the rotor hats more resistant to fade and wear and will hide brake dust better. Due to popular, demand all lightweight rotor rings will also feature zinc plating. This high quality coating will slow the effects of corrosion and keep your rotor rings looking good through the winters.

IN STOCK AND READY TO SHIP!

FINALLY a low cost rear BBK (Big Brake Kit) for your B5 A4/S4. NOTE: A4 requires S4 rear calipers and caliper hangers to do this conversion. Use the drop down box on the ordering page to add these.

Stock vs. JHM
-Rotor OD: Stock B5 S4 = 256mm(10.07″), Stock B5 A4 = 245mm(9.64″), JHM = 300mm(11.8″) – Almost 2 full inches LARGER for B5 S4 and over 2 inches for B5 A4 for better braking performance.
-Rotor Weight: Stock = 12lbs(each), JHM = 9lbs(each) – 25% LIGHTER, 3lbs less each
-Rotor Cooling Air-gap: Stock = 8.5mm(.334″), JHM = 13mm(.511″) – LARGER for better cooling
-Rotor Cooling Center Fin Design: Stock = Straight Fin, JHM = Airfoil – MORE EFFICIENT for better cooling
-Rotor Thickness: Stock = 22mm(.866″), JHM = 22mm(.866″) – SAME
-Bolt pattern: – SAME (fits like an OEM rotor would)

INSTALL NOTES: Due to the relocation of the rear caliper making it more outboard you are required to unsnap and release the plastic sleeve for the parking brake cable in the lower rear control arm. This is necessary to allow the cable to be pulled rearward some so it can reach the caliper without kinking or excessive stretching. (NOTE: This sleeve is usually brittle and prone to breaking and sometimes hard to release, so do not be worried if it breaks when performing this mod. As long as you can get it so the cable can be pulled rearward some you did the job correctly)

INCLUDES:
2 – JHM 2-piece Lightweight 300mm (11.8″) Rear Rotors. (Each rotor weighs 3lbs less than stock for a total of 6lbs weight savings.) 25% lighter!
2 – Caliper adapter brackets made from 1/2″ SS.
4 – Caliper adapter bracket mount bolts
2 – DOT Stainless Brake Lines for B5 S4 calipers
-Works with stock replacement B5 S4 rear brake pads. Such as OEM, Hawk, PBR, Mintex, Etc. We sell pads as well, if you don”t see the ones you want contact us for details.

NOTE FOR B5 A4 OWNERS:  You need these parts to complete the kit (new or used) 

1 x 8D0615423C – LR Caliper
1 x 8D0615424C – RR Caliper
2 x 8D0615425 – Caliper Hanger (each)
4 x N10240901 – Caliper to Caliper Hanger bolts
4 x N10181502 – Caliper Hanger to Spindle bolts

Outer ring specs:
We worked closely with a race brake manufacturer that supplies many NASCAR racers and a couple major brake kit companies. Due to their expertise we chose to have them build us the outer rings to our specs to fit the B5-S4. 12 attachment points for durability and strength.

Center hat specs:
We CNC machine the Aluminum center hats in house based on their recommended materials and thicknesses for durability. 12 attachment points for durability and strength. We also engrave JHM in them in 3 locations equal from each other, it looks clean and doesn’t jump out or look tacky.

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NOTE: With the installs we have done we have found that our slot design is whisper quiet.
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Note – This brake upgrade only fits under 17″ wheels or larger.

Please note: JH Motorsports does not recommend using EBC brake pads with our 2-piece lightweight rotors. Customer have reported and we have found EBC pads leave excessive pad deposits that can cause brake pulsation. Many EBC pads have a break in coating that reacts with the zinc plating used on our rotors.

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