I'm selling (have a buyer) my 77 CJ7 Quadra Trac. Haven't driven it much since summer and too busy with other projects to get it read to sell. Took it to my regular repair shop to have the drum brakes checked, since I had a hard pedal. After two days of them telling me that the brakes were fine, I paid them $45 and drove home. The buyer is from out of town and hasn't driven the Jeep. I told him about the brakes and he asked that I get them repaired. I agreed that was the right thing to do. So started looking here and elsewhere for reasons for a hard pedal. It appeared that it had to be a lack of engine vacuum or the vacuum check valve, since brake operations (at the wheels) and the vacuum booster appeared to be operating correctly (pump pedal with engine off and keep light pressure on brakes, then start engine and pedal moves forward). Couldn't find a check valve kit listed for the Jeep, so headed to the nearest parts store. It happened to be Auto Zone and I got lucky. The guy behind the counter was actually knowledgeable and $5 later I as on my way home. Took 2 minutes to replace the valve and all is well. Going to call the shop this morning. I should have know after the first time they told me the brakes where fine that they had no idea about working on old cars. I have used them for my "modern" vehicles and had great luck. But I wouldn't trust them again for any CJ work.