I got back from a trip yesterday and started my 98 Yukon after 4 days of not driving it. It started fine, but when I tried to use the brakes the dang pedal sank to the floor and the brake light came on the dash for a second.
I got it home and this morning inspected and bled the brakes. Its better, but still not right at all.
The master cylinder is only about a year old. I don't see any leaks.
Sounds like the master cylinder has gone bad...it is bypassing around the piston. Get a new master cyl. Bench bleed it and install it and bleed your brakes and you should be good to go.
Went thru about 4 of these things in the 80s on my 79.
Silly brakes only worked when they wanted to.
Scary feeling when the pedal goes to the floor, eh?
Must have got a good one last time around----still working like it shoud.
I was thinking about taking this one apart to see what the heck happened during that 4 day sit.. I might just rebuild it for the practice.. Never tried that before.
I have over the years re-built master cylinders as well as wheel cylinders. Just clean them up, hone them out, and replace the rubber cups or O rings etc. I found they did not hold up like mew ones. But then I got to thinking about it....You do take off some metal honing and increase the bore size just a tad. The rubber parts are still standard size not oversized a tad to compensate. I then quit doing it....brakes are just too important to play around with. Even the rebuilt parts. I always buy new parts and I like the name brand stuff like Wagner, etc. It might cost more but it could save your life or somebody elses.
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