My brakes seem to apply by themselves when I am driving in town 35mph and just coasting, like off and on pressure to the pedal. Almost feels like down shifting then up shifting quickly. Also makes a ticking sound that quits with slight pressure on brake pedal. Put the truck up on blocks, put it in drive while running and depressed brake pedal, master cylinder made a grinding or chattering sound when almost at the end of braking pressure then noise stopped at full brake pedal travel. I replaced pads shoes front calipers a while back and brakes work fine otherwise. Power boost unit shows that fluid at one time leaked a bit from master cylinder, paint crinkled, but no fresh fluid leak is visible now. Applying brakes causes idle to slow down some too.
Feb 2, 2008 at 5:40 AM