Cannot loosen the brake bleeder bolts

GMC C1500
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71CHEVELLE
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Hi, i have 1994 GMC 1500 truck. i put new brake lines on front to rear, now i can't loosen the bleeder bolts. do you know what size they are? if so can i bleed them another way? what can i use to brake the bleeder bolts loose? they are rusty and one is stripped. can i bleed them through the front somehow through the master cylinder? Thank you, Jayson
Nov 9, 2007 at 9:36 AM
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KASEKENNY
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You will want to soak them overnight in penetrating oil to have any chance at breaking them loose. Make sure you use a brake bleeding wrench. They are sold in a set so you will have all the common sizes. Pictured below. This will make sure you have the best chance of not rounding the bolts.

If you do not bleed through the bleeder, then you run the risk of having air in the caliper or wheel cylinders. So you don't want to do this and make sure you get them bled. If you cannot then you will need to replace any of the wheel cylinders or calipers that you can not break loose.

Please let us know if there are questions. Thanks
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Mar 26, 2020 at 5:01 PM