rebuilt boosters
Bob:
It is not uncommon for a vacuum leak OUTSIDE the booster to cause your symptom. Such leaks are often associated with rough-running engine ... even dying when brakes applied /near idle. You make no mention of stalling so I'm leaning toward either a failing booster or faulty hydraulics.
Due to rubber degradation from routine heat, age, stress ... I'd try to skip the junkyard boosters. MANY boosters are available as rebuilt ... I've seen where you can have yours rebuilt and returned ... sorry but I don't recall where ... if I do, I'll post here.
You might begin your search for a freshly rebuilt booster at your local auto parts store. I would insist that any rebuilt booster shall include NEW, recently manufactured diaphragm(s) and a strong warranty. The preferred rubber used for today's vbb diaphragms is EPDM. To my knowledge vbb diaphragms aren't routinely available to general public. To add insult to injury, a diaphragm sells to booster-makers for about a buck. Anyway, unless you've got spare eyes and fingers ... you should also skip trying to disassemble a booster. I didn't stay at the Holiday Inn Express last night, but I once was Q Mgr for a major global OEM manufacturer/supplier of vacuum brake booster diaphragms. We'd all be interested to learn the diagnosis & solution??? Good luck.
JACK:gap
