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I've got a rude thing to say about that Brake Failure Light!!!
I had two worthy mechanics work on my brakes and they both said if the Brakes are good (4 new rotors and two new calipers in my case) and the Brake Pedal has strong pressure.... and new fluid loss or leaks,,,, that the extra effort to get the light to turn off isn't worth it:
quote the "Swedish Pit" mechanic: "You don't want to open a can of worms with the master cylinder." They said tape over the light and ignore it as my brakes are working fine (after a good deal of work) ... unless i wanted to spend even more bucks (already about $800 for getting my old brakes back to perfection ...except that pesty light!!....
I am not totally satisfied. But I trust my brakes. You may have to compromise. Perhaps the better mechanic, who did the rear brakes but didn't finish the front, he said, that he'd have to bleed the lines three times and perhaps replace yet another caliper before he'd get the line to work. Both shops are more concerned with safty, than appearance and don't consider the light to be the valid indicator of worthiness, but only actual inspection by a mechanic (in our state, yearly inspections of brakes by mechanics are required...)
Thus the compromise: either have a qualified mechanic check your brakes, or trust the work you've done and maybe consider disengaging the light (if a mechanic says your brakes are fine, most cars don't have these lights anyway)... but probably don't just replace masters. You're probably wasting money. It could be "imbalanced" bleeding of calipers and lines are effecting "pressure" indicator.... (as suggested by the former mechanic who did my back brakes (but not a Volvo specialist... and I am a little surprized that the Volvo specialist didn't think the light was worth the hassle!!)
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