Brake issue after pulling engine

[IDIBRONCO]

What is the RABS?

Rear
Antilock
Brake
System.
Have you checked your vacuum pump with a gauge?

 

[ihc1470]

The impression I get is before the engine work that the brakes worked with no issues is that correct? If that is correct then start thinking what you did with an engine R-R. You probably had the vacuum hoses off from the pump and maybe to the brake booster. Any chance you plugged the hoses to keep dirt out and by chance leave a plug behind. Have you actually measured how much vacuum the pump is pulling? Have you checked that the check valve in the brake booster is holding. If I am understanding things correctly the first pump it feels like you have power brakes and after that a solid pedal and not much brake correct? Have you really gotten on the pedal and if so do you have brakes or not?

Years ago a customer brought in a International 1600 Loadstar with the complaint that I have a hard pedal but no brakes. They were correct. The truck had been just neglected for many years which is typical of a farm truck and slowly over time the pistons had all frozen in the cylinders. When it got down to the last one the result was no brakes. The other issue I have run into a few times is they would let the brakes get so far out of adjustment that when you stepped on the pedal you had a solid pedal but not braking because the pistons could not travel anymore to take up the excess clearance.

In both those examples they were drum brake systems. You should be dealing with a disk/drum system so a little different yet if the self adjusters are not working on the rears you will eventually run out of piston travel. Front caliper pistons can stick but the usual sympton is rapid pad wear because the pistons can not return enough to release pressure on the pads.

That though is the reason for the original question of the brakes working without any issues before the engine work. It will help to know which rabbit trail to go down.

 

[steelholder]

Rear
Antilock
Brake
System.
Have you checked your vacuum pump with a gauge?

Happening tomorrow

The impression I get is before the engine work that the brakes worked with no issues is that correct? If that is correct then start thinking what you did with an engine R-R. You probably had the vacuum hoses off from the pump and maybe to the brake booster. Any chance you plugged the hoses to keep dirt out and by chance leave a plug behind. Have you actually measured how much vacuum the pump is pulling? Have you checked that the check valve in the brake booster is holding. If I am understanding things correctly the first pump it feels like you have power brakes and after that a solid pedal and not much brake correct? Have you really gotten on the pedal and if so do you have brakes or not?

Years ago a customer brought in a International 1600 Loadstar with the complaint that I have a hard pedal but no brakes. They were correct. The truck had been just neglected for many years which is typical of a farm truck and slowly over time the pistons had all frozen in the cylinders. When it got down to the last one the result was no brakes. The other issue I have run into a few times is they would let the brakes get so far out of adjustment that when you stepped on the pedal you had a solid pedal but not braking because the pistons could not travel anymore to take up the excess clearance.

In both those examples they were drum brake systems. You should be dealing with a disk/drum system so a little different yet if the self adjusters are not working on the rears you will eventually run out of piston travel. Front caliper pistons can stick but the usual sympton is rapid pad wear because the pistons can not return enough to release pressure on the pads.

That though is the reason for the original question of the brakes working without any issues before the engine work. It will help to know which rabbit trail to go down.

Yes brakes worked perfectly before (even with the old leaky booster). The only thing that "changed" was I cracked one of the ports on the vac manifold, covered it with JB weld and repositioned the hose on one of the unused ports. Perhaps my jb weld fix was no good and it's leaking from there? I will verify that after I vac test it this week.

 

[ihc1470]

What comes to mind is yes you have vacuum but not the volume of vacuum that you actually need. I would be looking at the jb weld fix I am wondering is you don't have the port mostly blocked off and it needs to be a much larger hole. You may need to find a better manifold for a replacement.

Think of it like a water hose valve, crack it just a bit and yes you have flow into the glass but flip the glass and sit it back up and it is going to take a bit for the glass to fill again.

 

[rreegg]

I think Nick Pisca has some information on the vacuum manifold on his website. No idea if he/it’s still active or not but less than a year ago saw there are custom vac manifolds for sale on there.
I came across it by researching vac line routing diagrams

 

[steelholder]

All right guys i think i finally figured this one out. When i pulled the engine i broke one of the ports on the vacuum manifold and sealed it with jb weld. When i moved the hose that originally went there to a different port i didn't realize that the new port had a smaller hole, this didn't allow enough suction through that specific port which caused the hose going to the booster to not have enough suction. I took a drill to it and made it wider, reconnected everything and the brakes are back.

Now on to figure out why I have a ridiculous amount of positive camber and try to fit some 33s on it

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[ihc1470]

Good job!