Re-bend the 'spring wire' retainer to tighten up master cylinder cap .. Use care when installing cap & retainer as not to bend or distorted the clamping spring wire! .. IF this is done right, the leak is fixed!
RepairPal Certified shops can diagnose and repair your 1990 Oldsmobile Cutlass Supreme. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.