frenchbus

I have a 1998 GS 300 with 155,000kms. Last week the brake peddle movement increased considerably when brakes are applied. There are no faults lights on the dash. After bleeding the brakes there is no change and Lexus advises that the Power Boost in the Master Cylinder is faulty and suggests replacing the entire unit.....................very expensive. Would anyone verify this advice and advise me if a Master Cylinder at 1/5 the price from a wrecker would be a good idea? :cries: