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Jan 23, 2013 | 08:45 AM

haaaammmmmm

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brakes

Hey fellerrsss, I'm about to pull my hair out, I have a 1988 f350,with a 7.3, and now on these cold mornings my brake petal will throw itself to the floor when touched, it pulls back up and doesn't do it at every use, but is this vacuum related or from the master cylinder, would appreciate any intell, thanks

Jan 23, 2013 | 08:53 AM

Rocky RaetzIDI

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From: Naples FL

umm sounds kinda like a master cylinder but a vacum pump woukld cause a hard vary hard pedal .. i woul check MC ...

Jan 23, 2013 | 09:29 AM

kc0stp

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From: Co

Might check fluid levels and for any leaks, clutch on my racecar did the same thing when the (new) slave cylinder had a slow leak.

Jan 23, 2013 | 09:29 AM

haaaammmmmm

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Well its kinda wiered, because the power steering acts funny too, if I'm sitting in like a drive through with the wheel half pinned or so, the steering wheel will almost like pulsate, kind of jerk back and forth

Jan 23, 2013 | 10:38 AM

Rocky RaetzIDI

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From: Naples FL

ohh is it a hydrobooster ??? if so i belive its run off the power steering pump may have a weak P/S pump dose it wine ??

Jan 23, 2013 | 01:16 PM

joshofalltrades

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Quote:

Originally Posted by haaaammmmmm

my brake petal will throw itself to the floor when touched, it pulls back up and doesn't do it at every use

when you say it throws itself to the floor, are you saying it just about falls to the floor cause theres no pressure pushing back on it, or that it pulls itself away from your foot? does it stop at a normal height?
do you have the usual vacuum powered brake booster, or did someone convert to hydroboost? assuming you're on vacuum brakes, your steering pulse has nothing to do with your brakes

i used to have an f150 with a bad booster that would suck the pedal down whenever the engine was started, and couldn't be pulled back up with the engine running. the booster was obviously the problem there.

on some of these cold mornings, my van has had the brakes be very touchy or grabby, i'll barely touch the pedal and just about lock em up. tightening the rear brakes helped a bit.

Jan 23, 2013 | 04:14 PM

haaaammmmmm

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They are regular power brakes, its when I start to push the pedal down it will go down more then normal, but it will just like jump off of my foot, have to pull it back up with my foot when driving, but now I just replaced my glow plug controller and its not activating, any idea on that, I accidentally bumped a wire together and it arched, could it have blown the fuse??!!!!