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#30428 08/13/2003 6:43 PM | Joined: May 2003 Posts: 22 Junior Member | | Junior Member Joined: May 2003 Posts: 22 | Well.... I replaced my water pump, truck's running well. Took it to town to have a full exhaust system on her. In the parking lot at the shop I was turning the truck around, hit the brake, peddle to the floor. Pumped it twice and the brakes came back. The shop fixed my exhaust and when I drove home the brakes did the same thing every time I came to a stop. Gotta tell ya it was a nervous ride home. I can't find any leaks, the master and wheel cylanders were rebuilt a couple of months ago and I have new hoses. Any ideas.
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'50 1/2 ton GMC
'50, '59, 1/2T, GMC
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#30429 08/13/2003 6:57 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Did they run the new exhaust too close to any brake lines?
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#30430 08/13/2003 6:57 PM | Joined: Jul 2002 Posts: 385 'Bolter | | 'Bolter Joined: Jul 2002 Posts: 385 | Time to rebuild/replace the master cylinder. If the seals or diaphram are old and hard, they're an accident waiting to happen. Pull the M/C apart and check for pitting/scoring on the piston bore; brake fluid traps moisture and may be eating away the metal from the inside (especially if it's been sitting a while).
Recheck each wheel cylinder, they could be suffering from the same internal corrosion and spitting tiny amounts of fluid; and it's a good idea to completely flush the hardline and replace everything that looks "iffy."
edit: Josiah, I read the post to mean the brake went to the floor before the new exhaust was installed. :confused: | | |
#30431 08/13/2003 8:40 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | First I would inspect the wheel cylinders for leaks. If none, the try bleeding the brakes. If the m/c won't hold you'll have to work on it or replace it. You can rebuild it, but if the bore is pitted, it will have to be sleeved or replaced.
Fred
52 3600
69 C-10
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#30432 08/14/2003 10:19 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Try this,,, pump the brakes until you get some pedal feel. If the pedal slowly goes to the floor while you have pressure on the pedal or if you let up a LITTLE and then press back down on the pedal and it goes to the floor the seals inside the master cylinder are toast  DO NOT DRIVE IT until you get it fixed/rebuilt or otherwise. I would hate to hear that you lost the brakes completely and crashed your truck and you 
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#30433 08/14/2003 3:59 PM | Joined: May 2003 Posts: 22 Junior Member | | Junior Member Joined: May 2003 Posts: 22 | Thanks for all of the advice. Irebuilt all of the cylanders about 3 months ago and the truck was only driven a few miles since. I have tested the brakes during this period and they always worked and had good pressure. I'll try that trick of holding the brake down and see if it bleeds off.
Once again thanks!
'50, '59, 1/2T, GMC
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#30434 08/16/2003 11:58 PM | Joined: May 2003 Posts: 22 Junior Member | | Junior Member Joined: May 2003 Posts: 22 | I found the problem. Air in the line, bled the lines and everything seems very nice.
Thanks for all the advice.
'50, '59, 1/2T, GMC
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#30435 08/17/2003 12:17 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Good to hear things are worked out 
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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