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Post by slowray on May 2, 2014 17:40:44 GMT -6
Ok all, pulling what little hair I have left out. Blew a front brake hose last night. No problem been an auto/airline mechanic for years. Got two new hoses left and right and figures it was a good time to put the new calipers on. Job done and here starts my dilemma. CANT GET THE BRAKES TO BLEED!! The better half has legs that look like Charlie Atlas. 45 mins of pumping brakes for me, air still in the system. Bought a vacuum pump for bleeding, still air, lots of it. Pedal goes to the floor. No external leaks. IS there a mantra you have to repeat over and over to get the brakes to bleed. I actually took the calipers back off and bench bled them still gobs of air in the system. ABS? I was looking at my factory manual and it references a reader to put the ABS system into a maintenance mode? Any of this make any sense? Looking for suggestions. It's a 98.
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Post by Toronado3800 on May 2, 2014 20:09:09 GMT -6
I have not even done pads on my Aurora, but my 89 Toronado fought me with brake bleeds.
I put it up on a rack at the shop, removed the wheels and opened every bleeder a bit. I think I had the cap off the master cylinder. After a few hours of refilling and making a mess I closed them all, bled it normally which yeilded few if any bubbles, and then it was fine.
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Post by slowray on May 3, 2014 10:46:37 GMT -6
Finally took off the new calipers and bench blead them a second time. Was a little more diligent this round. No air in system nice clean fluid but still no pedal. Thinking I may have torn up the seals in the master cyl by repeatedly pushing it to the floor during the bleeding process. So I guess since that's not that big a job that's where Ill go next. Day two of a project that should have taken about 3 hours. Kind of makes ones head hurt.
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Post by slowray on May 3, 2014 14:51:04 GMT -6
No luck after the master cyl change. Went to the back calipers pax side bled easily drivers side has more air in it than my x-wife. Cant understand where all the air is coming from. Closed system, no leaks, but tons of air.
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Post by slowray on May 19, 2014 16:05:23 GMT -6
Week two update. Completely removed the ABS/TCS system. Re-plumbed the brake system. Should be the fix, back to simple power brake system with no computer or pump pack telling the brakes what to do and hiding air in the system. No fix. If with the new plumbing I block off the front brakes at the master cyl I have a rock hard pedal. However with the rear blocked no pedal. Here is the confusing part. If I block off one of the front calipers, doesn't matter which I get pedal. Seems the master cyl isn't pushing enough fluid for both the calipers. Remember its a new master cyl. No leaks anywhere and absolutely no air in the system. Thinking a proportioning valve for the front brakes may remedy the problem or a larger bore master cyl. Any body have any thoughts.
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Post by slowray on May 20, 2014 16:48:40 GMT -6
Problem solved. New calipers were not marked, boxes were. Evidently calipers got swapped from box to box. If the caliper is installed on the wrong side the bleeder port will be below the feed line. Not a good thing, physics will tell you air stays in caliper since your bleeding it below the air pocket. With the buggers on the correct side all is well. Lesson learned.
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Post by mattn on Mar 8, 2019 13:44:53 GMT -6
Who would have thought that was the problem? So much work over such a silly thing.
i was looking for procedure to bleed my brakes, and saw your thread here. It got me worrying. Thanks for posting the final resolution. Now I just need to find a good procedure for bleeding my brakes by myself.
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