Emergency Brake
Elder User
Joined: Jun 2007
Posts: 853
Likes: 1
forgive me if I'm wrong,maybe its different on a 550.But the e-brake is a mechanical device.Comprised basically of a cable run from a lever to the rear brake drum.Nowhere at all is it involved with engine function.therefore I dont see how it could efect the operation of the engine.I dont mean to sound like an ash,just trying to understand this.
Edit:just noticed you are new to the forum.So let me welcome you.
Edit:just noticed you are new to the forum.So let me welcome you.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Edit: Joe may be onto something. When releasing e-brake hold your foot on it and let it release slowly and see what happens.
Elder User
Joined: Jun 2007
Posts: 853
Likes: 1
E-brake on manual tranny is interconnected to PCM, at least the switch to turn on e-brake warning light. A manual tranny truck wil not high idle if e-brake is not engaged or e-brake lamp is burnt out
Gone Fishin for Mark
Joined: Nov 2004
Posts: 1,354
Likes: 2
From: West of Houston
Our ambulance with an auto tranny won't high idle without the PARKing brake either. Good thought there too.......
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Brett Foote
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I have a 550 and the parking brake is the same as the little brothers.
I also think that the thud of the brake lever releasing is shaking something electrical.
I would begin my investigation in that area.
I also think that the thud of the brake lever releasing is shaking something electrical.
I would begin my investigation in that area.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
You unplug it from under the hood by unscrewing the single screw in the middle of the plug, 6mm bolt with a 10mm six point bolt head right in the middle. The whole thing will walk out when you unscrew the bolt.
Go inside and unmount it from the screws after that.
I'm more suspicious of the fuse panel inside the truck right next to the PCM. But it is helpful to remove the PCM to gain easier access.
