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I have a workhorse w 18 chassis ,year is 2000. Pulled into a parking lot today, brake light came on and parking brake

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Customer: I have a workhorse w 18 chassis ,year is 2000 . Pulled into a parking lot today , brake light came on and parking brake locked. In middle of lot , could not move. went under motorhome and saw I could pull the pin on bracket to release parking brake .It worked ,but now I do not have park in the transmission . Does not lock. Still in neutral with no parking brake . All other gears work . WHATS UP?

Answered by mobile-tech in 1 hour 12 years ago

mobile-tech

20+ years of experience

556 satisfied customers

Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs

mobile-tech, Expert

Hello , my name is Joel

I have read your post , and have a question for you.

when you move the shift selector from park , with the key ON , you hear the pump motor running ?

We first need to figure out if your issue is mechanical or electrical.

I will watch for your reply.

-Joel

Customer

Hi Joel ,Jim here. No I do not hear the pump running . Is this a hydraulic pump? The push / pull switch on the dash does nothing . No sounds at all . I have not had time to take the dash off to check for power at the switch .How does it work? Power on till it hits a limit? Are the parking brake and park pawl somehow connected?

mobile-tech, Expert

Ok, thanks for the reply

There is no park pawl in your transmission , the auto-park system is what holds the coach in park.
When you shift out of park , an electric motor driven pump should should build pressure , and overcome a spring inside the actuator cylinder to release the park brake. When the shifter is placed in park , then the fluid pressure is released , and a spring applies the park brake.
system electric power comes through a fuse in the chassis fuse block , and through a fuseable link.
There are several pressure switches involved along with a relay to tell the pump when to run.
To troubleshoot the electrical portion , I would first check for 12 volts from the fuse and from the fuseable link , 12 volts should then be present at the pump relay....there is a pressure switch on the pump assembly - when this switch senses low pressure it triggers the relay to turn on the pump.
Your pump assembly may be underneath the coach on the right inside frame - or it could be in front of the drivers area under the front hood. The parts and electrical system are the same - regardless of location.
Use the electric and component diagrams below.

Be sure to let me know if you still have any questions or concerns .

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mobile-tech

556 satisfied customers

20+ years of experience

mobile-tech

20+ years of experience

556 satisfied customers

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