NismoSkyZ Posted November 14, 2006 Share Posted November 14, 2006 Hey i was just wondering if anyone experienced the same problem or knows how to fix the problem that I am having. On long trips, after about and hour and a half of driving an average of 70, I go to brake the the pedal just drops to the floor. There is slight pressure applied on the brakes, but definitly not enought to stop the truck in case of an emergancy. It happens on every single trip, but not durring city driving. After I pump the pedal a few times after it goes to the floor it goes back to normal. Any suggestions? Link to comment Share on other sites More sharing options...
FUELER Posted November 14, 2006 Share Posted November 14, 2006 Sounds like you have some air in your brake lines.... This definitely messes with the brake pedal and also changes with altitude. Try bleeding your brake lines? Link to comment Share on other sites More sharing options...
vengeful Posted November 14, 2006 Share Posted November 14, 2006 Your master cylinder is on it's way out. Get it replaced ASAP. Link to comment Share on other sites More sharing options...
NismoSkyZ Posted November 15, 2006 Author Share Posted November 15, 2006 Are you sure its the master cylinder? Is it difficult to replace it myself? I have the service manual and have done a lot of work on the truck. Link to comment Share on other sites More sharing options...
vengeful Posted November 15, 2006 Share Posted November 15, 2006 Well, the brake system is not holding hydraulic pressure in the lines, that's why the pedal goes to the floor. After pumping it a few times, it builds the pressure back up. You either have a leak in the lines that is allowing air into the system, or your master cylinder is on its way out. Pezzy had similar problems a while back....paging Pezzy. Link to comment Share on other sites More sharing options...
94extreme Posted November 15, 2006 Share Posted November 15, 2006 yeah, it's your MC. it's not hard to replace at all. you'll have to bench prime it and then bleed all the lines. while you're also doing this it's a good idea to thoroughly check the braking system. new MC will apply more pressure to the parts. so if they look old/worn then you ought to exchange them now too. i'd still just bleed it to start with unless you can hear a slight gurgling sound coming from the vac booster to which the MC is attached. Link to comment Share on other sites More sharing options...
NismoSkyZ Posted November 23, 2006 Author Share Posted November 23, 2006 Thanks everyone, Ill have to deal with it for a month more Link to comment Share on other sites More sharing options...
MichiganAve Posted November 23, 2006 Share Posted November 23, 2006 Waiting a month while driving it? Not worth it my friend, brakes=life. Link to comment Share on other sites More sharing options...
Simon Posted November 23, 2006 Share Posted November 23, 2006 Pezzy had a air in the lines causing her rear brakes to not engage. Her's just needed to be bled. Before going and ripping out the MC....I'd suggest flushing the brake system, and filling with new fluid. Basically, take out all you can from the reservoir with a turkey baster or something, then start bleeding, back to front, until all you see if fresh fluid coming through the lines. It could just be that some moisture, or something has contaminated the lines, and is burning off as you drive......causing the lack of pedal pressure. IT's worth a shot. Link to comment Share on other sites More sharing options...
NismoSkyZ Posted November 23, 2006 Author Share Posted November 23, 2006 I will bleed the lines tomorrow, Im okay as long as i tap the pedal periodically on long trips and I have no problems at all when city driving. This is what is confusing me...what happens on these trips? Link to comment Share on other sites More sharing options...
pathfindervirgin Posted November 24, 2006 Share Posted November 24, 2006 Hey, Im having a similar problem. I tend to lose pressure after the truck has been parked and turned off. Do you think it would be the same thing? Link to comment Share on other sites More sharing options...
NismoSkyZ Posted November 26, 2006 Author Share Posted November 26, 2006 (edited) I'm not sure if it is the same, but its quite baffiling that mine only does this on long trips. Virgin, it kind of sounds like you have a leak. If your truck is off and you pump the pedal, you should only be able to get about 3 pumps in because the pressure builds so much. Edited November 26, 2006 by NismoSkyZ Link to comment Share on other sites More sharing options...
RedPath88 Posted November 26, 2006 Share Posted November 26, 2006 Im okay as long as i tap the pedal periodically Your "ok" until that seal blows completely... then your screwed and maybe dead along with other people. Master Cylinders on thier way out are nothing to take lightly... one light you have brakes and the next your explaining to the officer why you did not stop As mentioned above.. not worth it my friend This is what is confusing me...what happens on these trips? City driving you are constantly applying and releasing the brakes, so the pressure is never allowed to bleed completely off like it is on a long trip. Link to comment Share on other sites More sharing options...
NismoSkyZ Posted November 26, 2006 Author Share Posted November 26, 2006 Thanks, looks like another job to do in the college parking lot Link to comment Share on other sites More sharing options...
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