Leak where Master Cylinder connects with Booster

Hi.
My ’95 Bonneville lost brake fluid and the pedal sunk while driving. I noticed I have a leak at the master cylinder right where it connects to the booster. I’m wondering what I need to do to fix this?? I’m thinking I need a whole new master cylinder?
Thanks,
Matt

You are correct. You will need a new master cylinder as the seal in the end has gone bad. Just remember when you change the master cylinder to bleed the master cylinder before installing.

Thanks for the help.
However, I have another problem. I currently don’t have a garage or any space to work on the vehicle at this time and I need to get it fixed very soon. I need to take the car in somewhere and want to avoid a huge bill. I was wondering if it would be smart to go and buy the remanufactured part for $60 and then asking a shop to just install it??? Do shops even do that? This way I would avoid the diagnostic fees and avoid paying $200 for a new master cylinder. Maybe I could just request a remanufactured part and hopefully they don’t go ahead and charge a huge “hydraulic system inspection” fee. Any tips on how I could avoid a large repair bill?

Some local mechanics will use the parts you bring in but will charge you a slightly higher labor rate. Your idea is sound in trying to save money that way but I would call around to some of the local garages first to see if they are willing to work with you. If you can't find a shop to use the parts you purchase then tell them exactly what you need done, what you need replaced and tell them to limit the repairs to only replacement of the master cylinder and bleeding both the master cylinder and brakes. Advise them that you know what is wrong and won't need a diagnostic. Remember, if you have ABS you will need to have the system bled as well and it will cost a little more. Good Luck!