Compression Ignition Addict
Join Date: Feb 2008
Location: Jersey Shore (Not Seaside!)
Thanked 87 Times in 73 Posts
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Autozone doesn't rebuild it, they source it from the cheapest rebuilder they can find. All calipers are going to say Ford on it. Ford contracted TRW to manufacture the calipers and they all have the Ford insignia on them.
The point about the bleeder screw is that the calipers left to right are interchangeable, it's only the bleeder screw location that is different and even some shop mechanics have installed the wrong side caliper, especially when the rebuilder puts the wrong caliper in the box. So it's important to check as an upside-down caliper has the characteristics you are experiencing.
So does air in the ABS controller, which consists of electronically controlled valves, pressure pump, and accumulator. If during a caliper change fluid was allowed to drain out of the master cylinder, air usually gets into the ABS unit. That's a bear to get out without having the computer control to activate the valves, pump, and accumulator. There's no bleeder screw on the ABS unit, which on your truck is located near the master cylinder on the driver's side. It has all the hydraulic lines going to it.
Ford went to all vacuum to try to save money. A vacuum boosted system does not have as high of an assisted hydraulic pressure as the hydro boosted units. I agree, with heavy GVW's I prefer the HB in all situations. Until the power steering pump fails. Nothing like loss of assist in both brakes and steering at the same time.
Former Vehicle Test Manager, Friction Products.
03 F350SC 4x4 6.0 Auto 5/30/03
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