They could of just over heated.
how do i change back brakes on a 1991 toyata corolla
Try putting in neutral at the time and see if it makes a difference. I had a similar problem w/1991 Lincoln and found that it was a recall from Ford. When brakes got warm they would apply, due to defective master cylinder
Bleed the master cylinder.& then rebleed the system.
A 1991 mercury topaz has drum brakes on the rear wheels.
check the power brake vacuum hose for a crack or break
brakes on all 4 wheels
Timing belt.
Alignment, dragging brakes, low air pressure in one tire.
Lincoln Prize was created in 1991.
On a 1991 Lincoln Continental : I'm not a mechanic / technician but I have never heard of aluminum heads for the 3.8 litre Ford V6 engine So , I would assume they are cast iron
I'll bet if you look in the rear fluid container it'll be empty - it either popped the lid and spilled or you have a leak in the line/master cycl or somewhere along the caliper - fill it back with fluid and pump the brakes a few times and see if there's any leaks
NO.