1992 toyota corolla, initial problem was brake pedal became stiff after several miles and some braking. This would cause passenger front brake to engage enough to cause vibration and require extra gas and downshift to continue. Brakes never locked. Replaced calipers, brake lines, pucks. hapeenend again within 20 miles. Used the car imtermittently vibrated intermittently. Did some research replaced the master cylinder this weekend. Problem still occurs but only intermittently. Happened again today and when I stopped to make a left turn pressed the pedal as hard as I could. By the time I got home 1 mile later the problem was subsiding. Problem subsides if I let the car idle for several minutes without the brake engaged or turn off the car for the same amount of time. Any ideas. Vacuum leak or is it the b power booster?
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