Is there a diagram of the brake lines for an 89 Oldsmobile regency brougham?

Yes, you can typically find a diagram of the brake lines for a 1989 Oldsmobile Regency Brougham in the vehicle's service manual or repair guides. Online automotive forums and websites that specialize in classic car repairs may also have downloadable schematics. Additionally, you might find helpful diagrams by searching for specific repair or maintenance resources dedicated to that model.