Alan Pitts
New Member
Parking brake won't release.
electrical or hydraulic issue
I reposted this under wheelloaders
I would check your brake pressure first. Remove the small cover attached to the lower right of your cab. There should be a test port for your brakes. I don't remember exactly but I believe it should be between 1800- 2000 psi. If you have the brake pressure, then its more than likely a electrical problem. There is also an accumulator valve that the brake pump output line goes into first, that's where the pressure switch is. I had one of those valves grenade on a 621.i am checking a 621D and the parking brake on the dash is on it will not go forward or reverse. any suggestions on that
The switch for the brake light is in the accumulator valve, inside the main frame right side of the machine next to the engine.i will check the pressure, where is the pressure switch located.