I noticed while detailing the engine bay last night that the brake master cylinder in my car has been leaking from where it meets the servo unit and brake fluid has run down the inner fender well and dissolved the paint down to bare metal over a fairly large area.

After a quick web search I found that the master cylinder is NLA so I ordered the seal kit. Has anyone rebuilt their master cylinder? How difficult is it? Any tips? Any special tools needed?

Also any advice on how to prep the bare metal surface of the inner fender well to prevent rust before I go about repainting it? Any product recommendations for this?

Thanks in advance!

 

 

 

How do the plastic fittings come out of the top? Do they just pull out?

 

The fittings just pull out. They they have barbs on them. When I bought a kit, it came with replacement barbs. If yours does, you can cut the rubber seals a bit to help it out, since the originals will be very stiff at this point.

Clean everything and lube the assembly with brake fluid when reinstalling.

Remove loose rust on the damaged panel with a scotchbrite pad. Spray Ospho on area and wipe off residual after 30 minutes or so. come back and scuff panel again 24 hrs later. Prime, paint, done.

Try to see if any fluid has gotten back into the booster.