Second Hand Peugeot 306 Brake Master Cylinder

Yes, every Peugeot 306 has a brake master cylinder — it is the hydraulic pump that pressurises the brake fluid when you press the pedal, and it is fitted to all variants of the 306 regardless of engine, body style, or trim level.

The Peugeot 306 ran from 1993 to 2001, with a significant facelift arriving in 1997 that brought revised front and rear styling; the brake master cylinder bore size can vary with engine and braking system specification, so a unit from a pre-facelift car may or may not match a post-facelift car even if the engines look similar on paper. You should confirm with the breaker that the part number or bore diameter matches your registration before buying. Never assume a pre-1997 and a post-1997 unit are a straight swap without checking.

Yes, it can — larger or more powerful engines were typically paired with bigger braking systems, and the master cylinder bore size is matched to the overall brake specification of the car. A cylinder from a 1.1 or 1.4 petrol 306 may not be correct for a 1.8 or 2.0 petrol variant, and the HDi or XUD diesel variants may differ again. Always quote your exact engine size and registration to the breaker so they can match the right unit.

Trim level alone does not determine which brake master cylinder you need — the 306's trim grades like LX, XR, SR, and GLX reflect interior and cosmetic differences rather than changes to the braking hardware. What actually matters is the engine size and model year, since those govern the brake system specification. When sourcing from a breaker, lead with your registration, engine size, and year rather than the trim name.

Yes, ABS-equipped 306s use a brake master cylinder that is designed to work alongside the ABS modulator, and it may differ from the unit fitted to non-ABS cars even when the engine size is the same. When contacting a breaker, make clear whether your car has ABS so they can supply the correct unit. Fitting a non-ABS cylinder to an ABS car, or vice versa, can compromise brake performance and safety.

The master cylinder is determined by the braking system specification — engine size, ABS fitment, and model year — rather than by body style, so a unit from an estate or cabriolet 306 could be correct for a hatchback if the spec matches. However, you should still confirm the part number against your registration with the breaker, as there may be subtle differences between production runs regardless of body style. Do not assume body style alone is enough to confirm compatibility.