This message is a reply to an archived post by jeffro_bodine2000 on May 03, 2013 at 16:16:28.
The original subject was "F700 Lucas Girling system brakes".
One quick and dirty check here-
States that the truck stops fine but the electric motor comes on - this would indicate that the park brake is de-energized (normal operation) or that someone disabled park brake.
Does the park brake work - pull the brake knob and try to move the truck.
Check the switch/pressure. The park brake hydraulic line is seperate from your service brakes, runs down the pass. side under truck. Is there pressure in the park brake line - remove the brake pressure switch - it is near the right rear wheel and put a pressure guage (0-150 psi will do)on the line,start the truck - park brake OFF. I think that switch actuates at about 15 - 20 psi. If the pressure is above that, replace the switch, if below - go after the 2nd power steering pump and lines.
The original subject was "F700 Lucas Girling system brakes".
One quick and dirty check here-
States that the truck stops fine but the electric motor comes on - this would indicate that the park brake is de-energized (normal operation) or that someone disabled park brake.
Does the park brake work - pull the brake knob and try to move the truck.
Check the switch/pressure. The park brake hydraulic line is seperate from your service brakes, runs down the pass. side under truck. Is there pressure in the park brake line - remove the brake pressure switch - it is near the right rear wheel and put a pressure guage (0-150 psi will do)on the line,start the truck - park brake OFF. I think that switch actuates at about 15 - 20 psi. If the pressure is above that, replace the switch, if below - go after the 2nd power steering pump and lines.
