2004 Porsche Boxster 3.2L Petrol · RB04 BOX

A concerning brake hydraulic failure at the rear and an associated inability to complete a brake performance test dominate the recent roadworthiness picture of this 2004 Porsche Boxster. The 2026-01-05 test was failed with a Dangerous defect recorded against the nearside rear brake pipe, which was leaking on the hydraulic braking system. The same test also produced a Major defect for an inoperative offside front position lamp and a further Major because brake performance could not be assessed. A retest the following day, 2026-01-06, returned a clean pass with no defects recorded, indicating the leaking brake pipe was rectified between the two tests. The previous three tests in 2025, 2023 and 2022 were all clean passes with no advisories, meaning the rear hydraulic line issue has emerged only at the most recent assessment after several years of unrecorded problems in this area. Mileage of 153,386 across roughly twenty-two years equates to an average accumulation of about 6,972 miles per year, which is broadly typical for a car of this age. The recorded tests are annual at the back end of the cycle, with consecutive entries in 2022, 2023, 2025 and 2026, although there is a noticeable gap where no 2024 test is listed. For a mid-engine sports car of this vintage, accumulated mileage of this level implies meaningful wear on suspension bushes, coil springs, drive belt services, intermediate shaft bearings, and the dual-mass flywheel or clutch components if manual, while the brake hydraulic seals, pipes and callipers will be approaching the kind of age where regular replacement is expected. For any prospective purchase, the priority inspection area is the rear hydraulic braking circuit, given the recorded leak on the nearside rear brake pipe at the most recent failure. The brake pipes on a 986 Boxster of this age are known to corrode along the underbody and within the engine bay, particularly where they run near the rear subframe and along the chassis outriggers, so a thorough examination on a lift or with the undertrays removed is strongly advised. On a road test, listen for any hissing or fluid dripping sounds after the handbrake has been released, and verify that the rear calliper pistons retract cleanly without binding, which can manifest as a dragging rear brake, hot rear wheels after driving, or a pulling sensation under heavy braking. Further to the brake concern, the front position lamp failure should be confirmed as a fully resolved repair rather than a temporary fix, and all lighting functions should be checked for consistent and sustained operation. Given the cumulative mileage, the test drive should include deliberate inputs over uneven surfaces to expose worn suspension bushes, failed drop links, top mount bearings and any knocking from the front strut assemblies, all of which are common wear items on high-mileage Boxsters. Steering should be evaluated for vagueness or fluid leaks around the rack, and the gearbox and clutch should be exercised with the engine warm to detect any judder, slip, or difficulty selecting ratios. With the recent rear brake pipe leak having been the only recorded failure across five tests, the remainder of the mechanical record is largely clean, but the age and mileage mean that a thorough pre-purchase inspection focused on the hydraulic system, underbody corrosion, suspension wear, and the flat-six drivetrain remains essential.