67speeda Posted July 1, 2014 Report Share Posted July 1, 2014 Its been a while. hopefully you guys can help me out yet again 2004 SSS AWD I recently did the 07 Tahoe front brake upgrade with SS lines. I also bled the rear brakes (fluid was horrible. almost black.) everything was fine for about 500 miles then i get "service brake system" light and message when i use the brakes medium to hard every so often. never when lightly braking. The message always clears itself, usually after a few seconds. brake fluid is full. Thanks for any and all input Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 1, 2014 Author Report Share Posted July 1, 2014 mods can you please move to the right forum Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted July 1, 2014 Report Share Posted July 1, 2014 mods can you please move to the right forum Done Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 2, 2014 Author Report Share Posted July 2, 2014 Might be the secondary vacuum pump or a leak. No codes found Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted July 2, 2014 Report Share Posted July 2, 2014 Might be the secondary vacuum pump or a leak. No codes found Could just be a "happen so" that something in the system has picked this time to go bad. Is your fluid staying up? You might try bleeding them again. Check your master cyl. for leakage. (They can be hard to spot if it leaking into the vac booster.) Good luck. Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 2, 2014 Author Report Share Posted July 2, 2014 thanks for your thoughts. Fluid is full and does not appear to be leaking or lowering at all Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted July 2, 2014 Report Share Posted July 2, 2014 I have read that if you introduce air into the anti lock brake module, (For instance, during bleeding), that it can cause similar problems. I don't have personal experience with this, have just read about it. Good luck man. Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 2, 2014 Author Report Share Posted July 2, 2014 I have read that if you introduce air into the anti lock brake module, (For instance, during bleeding), that it can cause similar problems. I don't have personal experience with this, have just read about it. Good luck man. Ugh I am positive i let the master run dry one time. long story. but that was about a year ago.... anyway to bleed the abs system without a tech 2 my train of thought: No ABS, weaker brakes, "service brake system" under hard braking, fluid full, no leaks found, Parking brake sensor disconnected, for some reason my master does not have a fluid level sensor Things that may be bad: Master Brake booster auxiliary vacuum pump maybe i will do the hydoboost swap effectively replacing all 3 Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted July 3, 2014 Report Share Posted July 3, 2014 Ugh I am positive i let the master run dry one time. long story. but that was about a year ago.... anyway to bleed the abs system without a tech 2 my train of thought: No ABS, weaker brakes, "service brake system" under hard braking, fluid full, no leaks found, Parking brake sensor disconnected, for some reason my master does not have a fluid level sensor Things that may be bad: Master Brake booster auxiliary vacuum pump maybe i will do the hydoboost swap effectively replacing all 3 Hydraboost For the Win. :thumbsup: I've got the parts just need to park the truck long enough to install. Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 8, 2014 Author Report Share Posted July 8, 2014 I got a bleeding tool and used something like 60+ ounces of fluid bleeding the brakes. No leaks anywhere same problem I really think the master is shot Got a new master on the way also go a hydroboost unit for the swap Although i did get a master and pump with the hydroboost i am going new with the master and reusing my old pump with a T fitting hopefully the money pit will be fixed soon Quote Link to comment Share on other sites More sharing options...
67speeda Posted July 12, 2014 Author Report Share Posted July 12, 2014 It must have been the master. Did the hydro booster swap and it stops better than ever now. However I now have a noise when accelerating. ...I really hope the pump is ok Quote Link to comment Share on other sites More sharing options...
Blown 346 Posted July 12, 2014 Report Share Posted July 12, 2014 If the master was going bad, push on the brakes and see if the pedal goes to the floor. I had a bad master but never had the warning message. I would re bleed the brakes and do the front and back. I use this method. Start the the passenger rear, thenr driver rear, passenger front, then driver front is last. I never had an issue. Quote Link to comment Share on other sites More sharing options...
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