You seem to be tackling the repair the correct way, but you need to go further and inspect/repair caliper pistons and seals.
I respectfully suggest you should not be driving this vehicle on the highway - you really are tempting fate and while your life is your own -you are of course potentially risking the lives of others.
Can you not just leave the car on your mechanics premises?
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NormanB
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K
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