I found this video to be very informative. Somewhat long, but it was a great refresher for this job. The comment you made about internal combustion engines being giant air pumps was interesting, too. Thank you for your efforts and sharing your process!
Thanks for the comment. Yeah, thinking about ICE engines as air pumps really changes how you think of them. The thing I forgot in this video that is also relevant is gas engines make vacuum because they have a throttle plate. When you are at WOT, the throttle plate is mostly open, hence little vacuum. When at idle, throttle plate is almost closed, so max vacuum. The reason why diesels have to have vacuum pumps is they don't have a throttle plate.
Check valve is fine, though I did have to make my own HVAC vacuum tank. I made a video about that actually. Wound up strapping it under the passenger dash and no more issues with the vents going to the floor under acceleration.
So you push down the brake pedal, but it does not return? That makes me think your master cylinder plunger is getting stuck in it's bore, or you have one or more multiple soft brake lines that are not allowing fluid to return to the master cylinder. Old soft lines are known to do this. The interior lining of the brake hose breaks down and then begins to function as a check valve, allowing fluid through on the heavy push of the brakes but not letting it back on the weaker return pull. I would also eyeball your ABS pump. A common issue on the Ford's of this era is the brake pedal will start to slowly drift down to the floor board and not want to stay up, with the ABS pump having an internal seal failure being the culprit.
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I found this video to be very informative. Somewhat long, but it was a great refresher for this job. The comment you made about internal combustion engines being giant air pumps was interesting, too. Thank you for your efforts and sharing your process!
Thanks for the comment. Yeah, thinking about ICE engines as air pumps really changes how you think of them. The thing I forgot in this video that is also relevant is gas engines make vacuum because they have a throttle plate. When you are at WOT, the throttle plate is mostly open, hence little vacuum. When at idle, throttle plate is almost closed, so max vacuum. The reason why diesels have to have vacuum pumps is they don't have a throttle plate.
You need to replace your vacuum canister and check valve. Plenty of TH-cam videos on it.
Check valve is fine, though I did have to make my own HVAC vacuum tank. I made a video about that actually. Wound up strapping it under the passenger dash and no more issues with the vents going to the floor under acceleration.
When I push the brake it, it stays compressed on the rotor. Any solutions or thoughts?
So you push down the brake pedal, but it does not return? That makes me think your master cylinder plunger is getting stuck in it's bore, or you have one or more multiple soft brake lines that are not allowing fluid to return to the master cylinder. Old soft lines are known to do this. The interior lining of the brake hose breaks down and then begins to function as a check valve, allowing fluid through on the heavy push of the brakes but not letting it back on the weaker return pull.
I would also eyeball your ABS pump. A common issue on the Ford's of this era is the brake pedal will start to slowly drift down to the floor board and not want to stay up, with the ABS pump having an internal seal failure being the culprit.