1988 f350 7.3idi brake problem
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Senior User
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From: Amsterdam, NY
1988 f350 7.3idi brake problem
I have a 88 f350 dump truck 7.3 diesel idi i can not get a brake pedal it fades to the floor,i put calipers on it a rear wheel cylinder pads and shoes and 2 new lines and a mastercylinder and bled the system for the last three days and it still fades to the floor,there is no air in the system and no leaks anywhere, any suggestions because i give up its consuming my days.thanks L.J.
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From: Charles Town, W bygod Va
https://www.ford-trucks.com/forums/1...-question.html
Heres a discussion about it.. doesnt tell you exactly what you need though.
Heres a discussion about it.. doesnt tell you exactly what you need though.
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Thread Starter
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Senior User
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From: Amsterdam, NY
88 f350 brake problems
adjusted all rear and bled all 4 except for rabs valve didnt know it had to be bled.
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Post Fiend
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Well, try bleeding it just as you would a brake. It is on the inside of the left side frame rail about level with the drivers feet.
If you do decide to bypass it there are two hard lines going to it, so you need a short length of hard line, with the correct fittings on it, such that you can join those two lines together.
If you do decide to bypass it there are two hard lines going to it, so you need a short length of hard line, with the correct fittings on it, such that you can join those two lines together.
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Senior User
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From: Amsterdam, NY
88 ford f350 idi brake problems
ok,this truck has new calipers new wheel cylinders,new front lines,new rear lines and everything in between,plus 2 mastercylinders and bypassed the rabs valve and bled the system for 2 days and there is no air in the system and no leaks anywhere and the brake pedal still fades to the floor any ideas.
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If you press the pedal several times with the engine off do you have a good pedal? If you start the engine and press the pedal does it then sink to the floor?
If the answer to both is yes then you have air in the system.
If the answer to both is yes then you have air in the system.
Post Fiend
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From: Charles Town, W bygod Va
If you hold steady pressure on the pedal and it slowly sinks to the floor you either have an external leak or a defective master cylinder. For the pedal to drop the fluid HAS to go somewhere... such as the chamber in the rabs valve (eliminated), or bypassing the seal in the mc. best way to tell if there is any air.. with engine off, pump the brake a few times to empty vaccum from the booster. release the pedal for a few seconds, then push down and note how far the pedal goes down, then give it 3-4 pumps. If the pedal stops higher up you either have air in the system or rear brakes need to be adjusted
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Senior User
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From: Amsterdam, NY
88 ford f350 7.3 idi brake problems
FIXED! I took it to a friends garage this morning and it took 2 hours of bleeding and driving and more bleeding and driving to finally get the air out and to have a good pedal, for some reason it just would not bleed all the air out without driving it also,my friend said he's run into this problem before thanks for all the input, L.J.