Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Hard Brakes › Reply To: Hard Brakes August 18, 2020 at 1:44 pm #963128 Sam SnowParticipant Yes, as mentioned I have 20 inches of vacuum going to the booster. However, in the linked article you sent they mentioned a combination valve. I’ll have to find & check it, hopefully that fixes my problem. Thanks 4 the reply and stay SAFE!