Is this correct?If brake fluid is being sucked into the engine from the brake master cylinder, both the master cylinder and power brake booster must be replaced?
Yes! Although you might wonder why, but a worn secondary seal on the master cylinder primary piston will allow brake fluid to escape into the brake booster. The brake booster should also be replaced because it has been contaminated by the brake fluid and the internal rubber components will soon fail, so you should replace it.
