Mechanics

I HAVE W/455CU,AUTO,PS,PB,AC -4 WHEEL DISC BRAKES-WHEN I DRIVE THE CAR THE BAKES WORK GREAT BUT AFTER DRIVING 2-3 MILES HIGHWAY OR CITY THE 4 WHEEL DISC START TO TIGHTEN UP & THE BRAKE PEDAL IS VRY HARD W/LITTLE TRAVEL.-I HAVE REPLAC

1979 Pontiac Trans Am • 75,000 miles

4 wheel disc tighten up w/o touching pedal
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Tomgonz
October 21, 2011.



Check that you have pedal free play, there should be a little free movement befor the master cylinder piston moves, you should be able to feel this with your hand pushing the pedal slowly.

Mhpautos
Oct 28, 2011.