brakes
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Junior User
Joined: Dec 2010
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brakes
hi all been awhile
1994 1/2 7.3 psd it has been sitting a few months I have a few problems 1. when engine running I have to pump the brakes continuely pedal just bleeds off no fluid lose , with engine off pedal is hard no bleed off any ideas ? the second problem is if I turn on lights or air my voltage drops below 10vdc the third is hard start I know I need a glow plug relay as no voltage passes through also I bet all the plugs are shot the ambient temp out is over 100 thx
1994 1/2 7.3 psd it has been sitting a few months I have a few problems 1. when engine running I have to pump the brakes continuely pedal just bleeds off no fluid lose , with engine off pedal is hard no bleed off any ideas ? the second problem is if I turn on lights or air my voltage drops below 10vdc the third is hard start I know I need a glow plug relay as no voltage passes through also I bet all the plugs are shot the ambient temp out is over 100 thx
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Junior User
Joined: Dec 2010
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ok i found a small white i assume is a vacuum line to the vent rotten and broke the brake pedal is still sinking and i have to pump to stop ,, the vacuum pump is sucking air when i unplug the hose it will pull my finger onto it , does anyone know what suction pressure this should create ? i also think i need to run all new main ground and positive battery wires , thx
Lead Driver
Joined: Apr 2016
Posts: 7,213
Likes: 1,342
From: Bahstun
might need a zero loss brake booster
mine does similar once in a while when at a light it will sink to the floor but can be pumped up
is your Alt pig tail loose? its not the best connection to begin with and many spice a new connector in
good hit list here with battery cables
https://www.ford-trucks.com/forums/1...ou-cranky.html
pump pressure
https://www.ford-trucks.com/forums/1...ke-vacuum.html
mine does similar once in a while when at a light it will sink to the floor but can be pumped up
is your Alt pig tail loose? its not the best connection to begin with and many spice a new connector in
good hit list here with battery cables
https://www.ford-trucks.com/forums/1...ou-cranky.html
pump pressure
https://www.ford-trucks.com/forums/1...ke-vacuum.html
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Junior User
Joined: Dec 2010
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knottyrope thank you for the links
have a few hours again this morning to work on truck again , ok at idle i have 21 " at vacuum manifold pedal is still sinking but not as bad since fixing the line leak to firewall
i also rigged a 2/0 ground wire from one battery to the frame my voltage drop is only maybe one volt now so i will make new cables from welding cable or buy new , fired right up this mornin have to get a gpr and plugs when i go to town still dont know about the 0 loss booster from what i am reading if it is bad my pedal would be hard ?? idk
also after all the looking yesterday i finaly found the sticky to trouble shoot things cant believe i missed them yesterday so many other this and that to fix i am sure i will be on here alot thanks for the help
have a few hours again this morning to work on truck again , ok at idle i have 21 " at vacuum manifold pedal is still sinking but not as bad since fixing the line leak to firewall
i also rigged a 2/0 ground wire from one battery to the frame my voltage drop is only maybe one volt now so i will make new cables from welding cable or buy new , fired right up this mornin have to get a gpr and plugs when i go to town still dont know about the 0 loss booster from what i am reading if it is bad my pedal would be hard ?? idk
also after all the looking yesterday i finaly found the sticky to trouble shoot things cant believe i missed them yesterday so many other this and that to fix i am sure i will be on here alot thanks for the help
Fleet Owner
Joined: Aug 2004
Posts: 20,419
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From: AZ
Logistics Pro
Joined: Mar 2007
Posts: 4,586
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From: knoxville, tn
Ohm put the glow plugs first. It is easy enough to do and you will Know their condition. Look real close around the rod that goes through the firewall for the master cylinder. Make sure it is dry. The master cylinder could be by-passing and allowing the pedal to sink
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