Blinker and Brake Pedal RPM Jump...Vacuum Pump? Baffled - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 12-17-2013, 07:35 PM Thread Starter
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Blinker and Brake Pedal RPM Jump...Vacuum Pump? Baffled

I have read other users post on here that when their vacuum pump goes out the pedal becomes really hard to press. Well my brake light is coming on and the pedal will push fine the first pump then hardly nothing on the second pump and then hard as a rock like a block of wood under it and will barely stop the truck on the third pump. This happens while driving and in park.

I can give it gas for about 8 seconds while in park and the brake light will go off and I will have pressure (sound) and normal brake again on the first pump but the same as before on the second and third pumps and then the brake light comes back on again.

The thing I cannot figure out is I can be driving down the road doing 60mph running a bout 2k rpm and when I turn on the blinker to change lanes the RPM's will jump 200-400 and when giving it steady gas and tapping the brake pedal it will jump more like 300 to 500 RPMs. Is this the vacuum pump or brake booster. Just replaced front calipers, rotors and pads.

What I cannot figure out is the blinker issue? Why would the RPM's and vacuum change when the blinker is turned on? It will do it when turning on the left blinker and the right. Do you think it is the vacuum pump? I would appreciate any insight on this one. You all have come through for me before! Thanks so much! This is a 95 F250 BTW

Last edited by Freebird; 12-17-2013 at 07:44 PM.
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post #2 of 5 Old 12-19-2013, 02:14 PM
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See the other thread that you posted to ^^^^^.
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post #3 of 5 Old 12-27-2013, 04:09 PM
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Dont know if you have resolved this...?

But I had the rpm change when using a blinker and found it was a bad bulb in a taillight, computer thinks you are applying the brake and shifts out of OD.
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post #4 of 5 Old 01-06-2014, 08:31 PM Thread Starter
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Originally Posted by Johne. View Post
Dont know if you have resolved this...?

But I had the rpm change when using a blinker and found it was a bad bulb in a taillight, computer thinks you are applying the brake and shifts out of OD.
Yep, that was it Johne thanks it ended up being the third brake light above in the top of the cab. Amazing how it was something so simple. My vacuum pump was bad too but the light fixed the RPM change. Thanks!
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post #5 of 5 Old 01-30-2014, 06:40 PM
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I had my pump go out in traffic while pulling my brothers 32ft boat, thank god for trailer brakes
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