Royal Enfield KAB00216/A – OEM Rear Caliper Piston Kit (Rear Brake) for Classic 350 Reborn, Meteor 350, Hunter 350 & New Bullet 350 (J-Series)

Restore factory-fresh rear braking performance on your J-Series 350 with the genuine Royal Enfield KAB00216/A Rear Caliper Piston Kit. This OEM kit is used in the ByBre rear disc brake caliper fitted to the All New Classic 350 Reborn, Meteor 350, Hunter 350 and New Bullet 350. Royal Enfield’s official online parts books list KAB00216 as the rear caliper piston kit for Classic 350 Reborn, Meteor 350 and the 2023-on Bullet 350 rear caliper, confirming exact OE fitment.

Unlike generic “universal” repair kits, this set matches the original piston diameter, finish and seal profile designed for the J-Series 350 rear caliper, ensuring correct braking pressure, smooth piston movement and long seal life. Leading multi-brand spares portals also catalogue KAB00216/A as “Brake Piston Kit” for Meteor 350, Bullet 350, Hunter 350 and All New Classic 350, further validating cross-model compatibility within the J-platform.

Ideal if your rear brake is dragging, feeling spongy, or showing uneven pad wear, this kit lets you rebuild instead of replacing the full caliper, saving cost while keeping everything 100% genuine Royal Enfield. Perfect for workshops and DIY owners who want reliable braking, reduced leaks and precise pedal feel on long rides.

Not suitable for older UCE Classic / Bullet / Electra / Thunderbird or 650 Twins / Himalayan calipers – J-Series 350 rear disc models only.

Key Features 

• Genuine Royal Enfield OEM part – Rear caliper piston kit KAB00216/A, supplied to dealerships worldwide.

• Designed for ByBre rear disc caliper used on J-Series 350 bikes (Classic Reborn, Meteor, Hunter, New Bullet 350).

• Includes correctly sized piston and sealing components for a precise, leak-free rebuild (OEM spec, not local copy).

• Restores smooth piston travel, reducing rear brake drag and uneven pad wear.

• Maintains original braking feel and performance as tuned by Royal Enfield & ByBre.

• Cost-effective alternative to replacing a complete rear caliper assembly.

• Manufactured to Royal Enfield quality standards and listed under HS code 87141090 (motorcycle parts & accessories) in official price lists.

• Backed by Underthehood’s strict fitment verification and packaging standards to minimise returns and mis-orders.

Compatibility Table

Platform: Royal Enfield J-Series 350 (Rear Disc Brake Models Only)

PLEASE CHECK PART NUMBER BEFORE PURCHASE 

Explicit exclusions:

• Not for older UCE Classic 350/500, Bullet 350/500, Electra, Thunderbird (different calipers & kits).

• Not for Himalayan 411/450 or 650 Twins (they use different rear caliper kits such as 594696/A).

Variants

• Single Variant:

  • Type: Rear Caliper Piston Kit (Rear Brake)

  • Part Number: KAB00216/A

  • Position: Rear wheel only

  • Quantity Required: 1 kit per rear caliper

(No LH/RH, colour or size variants – one standard OEM kit.)

What’s in the Box

• 1 × Genuine Royal Enfield rear caliper piston (KAB00216/A spec)

• 1 × Matching OEM seal / sealing components for the piston (as supplied by RE in this kit)

• 1 × Manufacturer packaging with part label for authenticity

(Exact internal contents may vary slightly batch-to-batch as per Royal Enfield packing, but always to KAB00216/A spec.)

Installation & Fitment Notes

• Recommended to be installed by a qualified mechanic or experienced DIYer familiar with hydraulic brake systems.

• Clean caliper thoroughly, inspect bore for scoring or corrosion, and replace pads if excessively worn.

• Always use fresh brake fluid and properly bleed the system after installation.

• Avoid mixing aftermarket seals/pistons with this OEM kit – use this set as a complete matched group.

• After fitment, check for leaks, free wheel rotation and correct brake pedal feel before road use.

FAQs 

Q1. Will this KAB00216/A piston kit fit my old UCE Classic 350 / Classic 500?
A: No. This kit is only for J-Series 350 rear disc brake calipers (Classic 350 Reborn, Meteor 350, Hunter 350, New Bullet 350). UCE models use different calipers and repair kits.

Q2. Is this piston kit for the front or rear brake?
A: It is specifically for the rear caliper. The front caliper on J-Series 350 models uses a different kit, typically KAB00215/A, so make sure you choose the correct axle.

Q3. Do I need one kit per side or per bike?
A: You need one KAB00216/A kit per rear caliper. Each rear caliper has a single piston, so one kit services one bike’s rear brake.

Q4. Can I use this kit on Interceptor 650 / Continental GT 650 or Himalayan?
A: No. Even though some generic sellers list those models, OEM microfiche and official kits show different rear caliper repair part numbers for Himalayan and 650 Twins. Use the correct kit (e.g., 594696/A major rear caliper kit) for those models.(INT AND GT 650 KITS ARE AVAILABE SEPERATELY)

Q5. What symptoms indicate I should replace the rear caliper piston and seals?
A: Common signs include rear brake dragging, uneven pad wear, brake fluid leakage around the caliper, or a spongy pedal that doesn’t improve after proper bleeding.