Brakes

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May 6, 2014 | 10:07 PM

buttwheat

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From: North West

Brakes

I rarely drive my truck. Today I got in and went to take off and it felt like the E brake was on it was my brake pedal in the pressed down position. I pulled it up with my foot and it released the brakes. It continued to stick down after every use. Any ideas guys?
The truck '78 F250 4x4 camper special 400 A/T

May 6, 2014 | 11:50 PM

wyckedcombo17

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From: Suburbs of Chicago

The cables are starting to freeze up on you. Try spraying PBlaster on/in the cables while working them released and applied. If you don't have PBlaster use atf

May 7, 2014 | 08:09 AM

buttwheat

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From: North West

Quote:

Originally Posted by wyckedcombo17

The cables are starting to freeze up on you. Try spraying PBlaster on/in the cables while working them released and applied. If you don't have PBlaster use atf

Are not the brakes hydraulic? Maybe My explanation wasn't written clear. It is like the the emergency/parking brake was on but it wasn't or hadn't been used, This is the brake pedal that is sticking down.
Thank you for your answer and I probably should lube the cables.

May 7, 2014 | 01:47 PM

Tim C

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Joined: Apr 2004

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From: Fayetteville, NC

Try lubing the pedal linkage behind the brake booster. There's some linkage back there that is bad about rusting from rain dripping down the firewall on these old trucks. If that doesn't fix it id start checking the master cylinder out.

May 7, 2014 | 11:05 PM

buttwheat

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From: North West

I will give that a try. Thank you Tim

May 13, 2014 | 02:13 PM

crazy96863

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Joined: May 2011

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From: Northern California

My guess is the issue is either the brake pedal linkage binding or the brake booster. The master cylinder engages with the pushing action from the plunger that goes between it and the booster... If the MC had an issue, pulling the brake pedal would not likely resolve it as the plunger cant transfer that pull since its not connected; its merely positioned up against the MC. The MC, being spring loaded, returns on its own pushing the pedal back (and everything inbetween) to the unpressed position.

If some spray lube doesnt help, look into a new booster; they go out after a few decades of use.