In vacuum assist brakes there is a motor mounted on the booster. When I start the truck the elec motor turns on and runs for about 1 mim then shuts off. My display in the dash says to service brake booster I check the wires and the blue that pluge into the elec motor says 12 + volts when I start the truck but when the elec motor on the booster turns on the volts drop to 4+ in 1 minute the elec motor shuts off and the volts jump from 4+ to 12+ back and forth. What do I need to do?I tried following:disconect battary to clear codes, did not workcycle the key off and on 5 times, did not workread codes Nonechecked fuses, okchecked the alternator, ok
have the same problem?
Sunday, April 8th, 2012 AT 6:18 PM