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I have been upgrading to front disc brakes, new MC and Power Booster. Went to bleed the brakes and I can't get the old or new bleeder screws to loosen to bleed. Anyone have any suggestions. I sprayed everything down with Kroll but not sure what do next. Afraid I will round the heads. Any advice would be greatly appreciated.
Bleeder screws where? On the new disc calipers or the rear wheels? If it’s rears, replace the rear wheel cylinders.
Use a 6 point socket to loosen the bleeders.
You said old OR new....is it both?. New ones should be no problem if you have the right size wrench. Be careful with new wheel cylinders, which could be metric! Try heat. Have a butane microtorch?
It's gonna sound backwards. But tighten them just a frog hair first. Thread pitch will always tighten easier, than to loosen. Then carefully back them out.
I can at least offer sympathy. Been fiddling with the brakes the past few days on my truck. A socket or box wrench stands much less chance of stripping the heads than an open wrench (wanna know how I know?). If some sort of penetrating oil doesn’t do it the suggestion of heat is a good one. If the wheel cylinders are original the heads should be 3/8’’ (at least mine were). The new replacements I got were 10mm.
Tap them wth a hammer and cold chisel. Don't beat them to death or bugger them up, just tap them. Tap your wrench lightly. Don' t over do it. Same concept as an impact wrench.
Lube tap.....Lube tap....go to the next...it might take a while.
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