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Showing results for tags 'brake servo'.
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Hello All, I have a basically stock 1973 240z thats been lowered by the previous owner. Probably cut springs. I drive the car about 3-4 times a year so obviously it sits for long periods of time. I knew from a while back the brakes seemed to be dragging. Well I went to drive it yesterday and the rears are really dragging. The car will not roll even on a slight incline. If you jacked up the rear you cannot turn the wheel. The car will move forwards and back by the power of the engine in first gear but it will not roll. Let off the the power and it will not roll. I changed the master vac a while ago using a Cardone A1 reman unit. I recently verified that the reaction disc is in place. A new master cylinder was installed at the same time. So I need to know the proper steps to diagnosing this. If I unbolt the master cylinder from the master vac there is no change, the rear drums stay locked. The emergency brake is in the down (not engaged) position. I'm wondering if its the master cylinder but I have no idea how to test it on the car or off. The stock front brakes also seem to be dragging but nothing like the rears. Not even close. Still leads me to the master cylinder. In regards to adjustment of the rod from the master vac...not possible Maybe some are adjustable but mine would not budge a mm. Yes I can see it has threads behind the acorn shaped end piece but they appear to be simply decoration as that thing doesn't budge. I havent tried any PB Blaster on it though. If I open the rear hydraulic lines for each rear drum brake will that release the brakes? All brakes lines appear to be in working condition. I'm not sure if I had the emergency brake on when it was sitting for the last long period or not. Just want to drive this thing and now I can't. Thanks for all the help in advance.
