gunmetal72
Life is a dark ride
The brake booster on my 72 Duster is not working properly, Has anyone rebuilt one or is it better just to buy a replacement?
i just put a booster and master cyl. from a 74 dart on my 72 brackets. worked fine. i think it ran me 135 bucks at orielys.I checked at NAPA about 2 yrs ago, and they said nothing was available as a stock replacement. You could try Rock Auto, but don't know if you will do any good. I would say, look in the Hemmings Motor News under "Services Offered" and see about a rebuilder like Booster Dewey, it will probably be pricey, will be done right, and should last your car a lifetime.
I want to make sure it is the booster and I think it should hold vacuum after I turn off the engine but when I pulled off the hose coming from the intake, there was no vacuum left in the booster. Hose was pulled off the booster about 10 sec after the engine was turned off. So, does this mean the booster is done?
So are you saying the cam I am using is not good for power brakes? I am not that knowledgeable when it comes to cams and vacuumMy experience with that booster and a 292/509 is not good. With a [email protected] it was not bad. With a [email protected] I threw it in the corner for a bigger one off a 73 Dart.
The check valve, if good, should easily hold enough vacuum for at least one stop from 60mph with the engine shut off.Sometimes they hold vacuum for at least 10 minutes after the engine is shut off.
I fear yours has a bad diaphragm, or a bad control valve, or the pushrod adjustment is preventing the control valve from seating.
If your engine runs rough with the brake applied,or the idle jumps around when you pump the pedal,it may be sucking air through a perforated diaphragm.If no change, then I would loosen the booster and space it towards the rad, about a quarter of an inch and let it sit there, at it's normal attitude.Hang it from the underside of the hood if you need to, or block it up. Then charge the booster by running the engine for a half a minute or more, at fast idle. Shut it off, and wait for ten minutes; then check for vacuum, by manipulating the check-valve. If none found I would assume the control valve is bad.
I am much happier with the large diameter single diaphragm.