Diagnosing A Hard Brake Pedal : OBS Powerstroke
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- Опубліковано 27 лип 2024
- Step by step guide to diagnosing a hard brake pedal on an OBS Ford Powerstroke, there are common failures but with anything, it's always best to diagnose before replacing parts.
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Great job brother.
Good video beautiful rig
Thanks!
I experienced a hard pedal yesterday. I just replaced my vacuum pump a month ago. I wonder of it is bad already. I'm going to perform these tests you suggest.
Thanks for posting.
I always recommend Motorcraft parts on these old Fords especially the vac pump, if you find your pump is bad go motorcraft.
I have the same issue. It started as an intermittent stiff pedal, usually fine at higher RPMs, then it became stiff all the time. That new constant stiffness was accompanied by a new belt/pulley noise.
I do have vacuum but it’s “choppy” would be the best way I could describe it. Assuming that combined with the grinding/clinking noise coming from the pump is indicative of a bad pump.
The vacuum pump may have a failing check valve internally.
What did the pulley sound like. My brake pedal all of a sudden got really hard to press then a small chatter came from the engine I got scared it was injectors
@hermeztorres5867 the vacuum pump can make noise, usually the diaphragm inside fails but bearing failure is also somewhat common. Use a mechanic's stethoscope to isolate the noise and replace that part.
@@RogueWrenching would the sound of a bad vac pump get faster/louder as you speed up then slower and quieter as you slow down because that’s what happens to me along with the external hard brake pedal
@hermeztorres5867 Yes it could. Feel free to email me a video and I can maybe give you a better direction RogueWrenching@gmail.com
I miss seeing this truck almost as much as i miss caboose
It's a pretty fabulous truck.
I replaced the vacuum pump/pully about 5 months ago (because the pully was jacked) and my brakes became incredibly stiff with a lack of vacuum a few days ago. I thought it was the brake booster, however my AC went out today. Can a faulty brake booster cause a loss of AC? Thank you in advance for your help!
Technically no, but the hvac in these trucks is run off vacuum, so if it only blows out the defrost vents that's a pretty good indicator you've got a vacuum issue. But the AC compressor / system that actually gets cold is unrelated to the vacuum system. But if that cold isn't getting put the dash vents that could be a vacuum issue.
Could you do a video on vacuum pump replacement that would be great
The new part will be here hopefully by the 30th, and I'm hoping to get the replacement video filmed / edited / posted this weekend.
New Video Just Dropped:
ua-cam.com/video/mUziAM24TzE/v-deo.html
What if I only have have a hard brake pedal at idle? But the booster works when higher rpm? Driving around parking lot, hard pedal. On the highway get a few good applications before it goes hard.
Check the check valve on the booster. It's also possible your vacuum pump is weak, connect a vacuum guage to the vacuum manifold while driving, and see if you run out of vacuum at idle. Also, if your booster has a leak, this can also present in the same fashion.
@@RogueWrenching So I did some checking today. Check valve is working. The pump is working but pretty weak at idle much stronger at 2000rpm (had the wife Rev it while I checked). Will try to track down a vacuum garage Monday.
@@Holow599did you figured out the problem? I’m having the same issue
@@esTaleCSGO yup it was a bad vacuum pump. I guess it could make some pressure at high rpm but none at idle. Pretty easy fix. Need a puller to remove the pulley from the pump though.
@@Holow599 oh okay,I’m planning to replace it when I get it! Thank you,I’ll just double check it just in case. Luckily I didn’t buy the brake booster
So what if you do have suction but the A/C is also acting up? Would it then be the solenoid that has gone bad?
What is the base problem? Hard brake pedal or ac only blows on defrost?
My vacuum pump is only putting out alil but I can feel it coming out of the check valve but it’s not much. Is that a sign of the pump, or check valve or should I replace both
Bad pump. Replace the pump and retest.
if those dont work the praportion valve on the frame also goes bad its bad in my 95 ps. it also has the same symptoms. just throwing that out there
Most often proportioning valves don't cause a hard unassisted feel, they cause reduced braking because when they fail you're still using the brake booster but only braking one axle (Front or Rear), the RABS valve can cause a sinking pedal, but then a master cylinder can cause a sinking pedal also.
Thanks for your comment and sharing your experience, often sharing abnormal cases like yours help other people searching for answers.
how many of gh should be coming out of the pum?? when you test it??
It should pull down to 26in/hg as soon as it's capped.
@@RogueWrenching thank you for youre answer