Catalogue, part numbers & downloads

The original equipment part number issued by the vehicle manufacturer. It is the most reliable way to identify the correct replacement cylinder, and the number your customers will quote to you. It is stamped or cast into the original unit, not printed on the invoice.

The number an aftermarket brand such as TRW, LPR, Metelli or A.B.S. assigns to its equivalent of an OE part. One OE number often maps to several aftermarket references, and one reference can cover several OE numbers — which is why a cross-reference alone is not enough for hydraulics.

The internal diameter of the cylinder, written in millimetres or in fractional inches. It sets how much fluid the piston displaces per millimetre of travel, so it decides pedal travel and pedal effort. A 7/8 inch bore is 22.23 mm — not 22 mm.

A clutch slave cylinder built around the release bearing and mounted on the gearbox input shaft, replacing the external cylinder and the release fork. It cannot be repaired and must be bled with a pressure bleeder rather than by pumping the pedal.

The two most common glycol-based brake and clutch fluid specifications. The seals in a cylinder must be compounded to suit them — EPDM and SBR are the correct families. Mixing fluid types or using a mineral-based fluid destroys the seals.

During-production inspection. We monitor the line early in a run so deviations are caught while they can still be corrected on the same batch, rather than at pre-shipment when it is too late.