Brake pedal goes to floor after 4 day sit. - Hot Rod Forum : Hotrodders Bulletin Board
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  #1 (permalink)  
Old 02-08-2009, 02:35 PM
weirdbeard's Avatar
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Brake pedal goes to floor after 4 day sit.

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.

What could cause this?

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Old 02-08-2009, 02:53 PM
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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.
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Old 02-08-2009, 02:59 PM
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That's what I am thinking too HH. Just don't seem right cuz the M.C. is so new, but I did get it from Advance.
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Old 02-08-2009, 03:06 PM
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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.
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Old 02-09-2009, 03:55 PM
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I pulled the M.C. off today and there was brake fluid behind it! I installed another one and it seems fine for now.

It really makes me mad that they can't make these parts last longer than a year.
Just ain't right.
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Old 02-09-2009, 03:58 PM
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Oh yeah Bryan it is a scary feeling when that brake pedal sinks to the floor! My heart sinks with it every time.
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Old 02-09-2009, 04:11 PM
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i agree with Henry.i have had it happen to me .and seen it on others also.m c goes bad bypassing to the booster.good call henry.
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Old 02-09-2009, 04:48 PM
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Quote:
Originally Posted by eloc431962
i agree with Henry.i have had it happen to me .and seen it on others also.m c goes bad bypassing to the booster.good call henry.
Brake fluid can ruin the booster too, so forewarned is forarmed!
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Old 02-09-2009, 04:55 PM
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Quote:
Originally Posted by flynbrian48
Brake fluid can ruin the booster too, so forewarned is forarmed!
Dang! I did not even think to clean that old fluid up behind the M,C!
Now I am just imagining it corroding my dang booster..

Maybe I will just try and spray some wd-40 back there.
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Old 02-09-2009, 05:36 PM
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I haven't had one apart since they were singles, but we used to just put in a new "O" ring. Maybe a little honing if needed. Much cheaper.
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Old 02-09-2009, 06:31 PM
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Quote:
Originally Posted by Cape Cod Bob
I haven't had one apart since they were singles, but we used to just put in a new "O" ring. Maybe a little honing if needed. Much cheaper.
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.
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Old 02-09-2009, 06:38 PM
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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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Old 02-15-2009, 08:17 PM
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Do Not Hone An Aluminum Master Cylinder!
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