i appreciate you sharing your experience, i feel it’s gonna lead to that.I know it's been said several times but it's most likely the master cylinder. I just went through this last week with my non- G Body, my 1978 Delta 88. It happened on my way back from a car show. The pedal got spongy and went to the floor several times but I was able to get home without incident. I checked the fluid level and it looked good. Climbed under the car and didn't see any visible external leaks. Took off the rear drums and everything looked good. No external leaks but was still losing pressure. Replaced the master cylinder and the problem was solved.
Yup, a hard pedal that goes almost all the way to the bottom before you get brake; at least that is how it happened to me and it was the booster that was the culprit. Have had them die on me in traffic without warning more than once. I did say that the booster is an outside possibility after all here.A bad booster gives a hard pedal, not spongy.
thanks for the tip, was not aware of that!!A couple of other thoughts. If the brake fluid container has been open for more then a week or two at the most it collects
moisture. That's why I only buy the small container. Also I had this condition quite a while ago because I used silicone
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