Stuck brake bleeder screws

[Leroy93]

'93 coupe, LT1. Need to flush/bleed brake system. Front bleeder screws don't budge turning counter clockwise. Using correct 10mm brake bleeder box wrench. Have applied one application of penetrating oil, no luck.
Have FSM and following it's steps a "simple" procedure except for the first step, "Loosen bleeder screw". (I had an '84 nine years and completely rebuilt its brakes with no such problem, also other cars over 45 years).
Have owned my '93 since new, now 83,000 miles, and I'm doing lots of service before caravaning to Bowling Green this Sept.

Any suggestions?

 

[gmjunkie]

'93 coupe, LT1. Need to flush/bleed brake system. Front bleeder screws don't budge turning counter clockwise. Using correct 10mm brake bleeder box wrench. Have applied one application of penetrating oil, no luck.
Have FSM and following it's steps a "simple" procedure except for the first step, "Loosen bleeder screw". (I had an '84 nine years and completely rebuilt its brakes with no such problem, also other cars over 45 years).
Have owned my '93 since new, now 83,000 miles, and I'm doing lots of service before caravaning to Bowling Green this Sept.

Any suggestions?

I heat them with a butane torch,and then shoot them with PB Blaster while there cooling!Sometimes it takes a couple times!!But they'll break loose!!

 

[aklim]

A crazy stupid trick that seems to work most of the time for me is to use a propane torch, heat the thing up and while it is cooling down, melt candle wax on the bleeder screw threads.

 

[jmccloud]

Brake bleeder screws

Use a 6 point socket to break the screw loose then use the box wrench to do the bleeding.

 

[Leroy93]

Thanks for the tip on PB Blaster. Used it. Applied it several times for two days to the front bleeder screws, used a long six point 10mm box wrench and they loosened. The rears only needed the longer box wrench. Job done. The front wheel areas get more water, gunk than the rear. Heat does work, just was a last option not knowing if heat would damage caliper pistons or any rubber in the area. Thanks!