I am taking my 67 New Yorker in for some service tomorrow but a new problem has reared up and I'd like a pointer or two before I ask them to look at it. The power brakes aren't working and at idle the car pulls very hard. When I depress the brake pedal it's not soft or hard but it makes a wooshing sound. I replaced the power booster a couple of years ago so I hope that's not it. I did read it could be a leaky master cylinder gasket. The fluid is fine, no leaks. Any ideas would be helpful.