Brompton Lower Stop Disc Set Mk3 Part No. Q102074

The Brompton Lower Stop Disc Set Mk3 is a replacement brake component designed for Brompton folding bikes fitted with hub gears and 16-inch wheels. This is the mounting hardware that sits at the rear of the frame, positioned to work with the rear brake calliper on standard Brompton setups. The part number is Q102074, and this particular unit comes opened and resealed.

The lower stop disc is part of the brake assembly that keeps the calliper in the correct position relative to the wheel. On a standard Brompton with hub gears, it bolts to the frame directly below where the brake calliper sits. If your Brompton has been modified with aftermarket brakes or a different brake system, the mounting points may no longer line up, which means this component won't fit as intended. For riders running original Brompton equipment or planning to return their bike to standard spec, this is a straightforward replacement part that gets the brake geometry back to factory tolerance.