HELP! NO BRAKES!

[Mulochico]

Might want to pick one up. Found this for $25:

http://www.autozone.com/autozone/ac...ester-kit/_/N-26ki?itemIdentifier=487843_0_0_

Got one a few years ago. Didn't think I would use it much. Not the most used tool, but as our trucks age it gets used more as parts dry out and deteriorate. Also will help you not put money out for unneeded parts.

My .02

 

[NintendoKD]

bad idea, they expand horizontally too much for this to be an accurate measurement, just trying to think outside the box. still neat to watch them expand though

 

[icanfixall]

Josh... You still have brakes when the peddle feels hard as hell to push down. You keep steady pressure on the peddle and the fluid will fill the brakes. you just can't be in a hurry to stop. What you feel when the vacuum is working in the peddle is easy to push down because the booster has a diaphram in it. Vacuum is on one side of it so it actually pulls the peddle down. Because you can hear a hissing noise I'm thinking its the booster like others have posted. All the above posting are good ideas about whats wrong. Without a vacuum gauge you really wont know if the problem is the pump or the booster. Ebay has vacuum pumps all the time too.

 

[bagpiperjosh]

Josh... You still have brakes when the peddle feels hard as hell to push down. You keep steady pressure on the peddle and the fluid will fill the brakes. you just can't be in a hurry to stop. What you feel when the vacuum is working in the peddle is easy to push down because the booster has a diaphram in it. Vacuum is on one side of it so it actually pulls the peddle down. Because you can hear a hissing noise I'm thinking its the booster like others have posted. All the above posting are good ideas about whats wrong. Without a vacuum gauge you really wont know if the problem is the pump or the booster. Ebay has vacuum pumps all the time too.

If it was the vaccum pump wouldnt there be no suction at the hose.. or very very little?

 

[firehawk]

Your booster likely has a tear in it. Also, when you replace the booster, see if the back of the master is leaking into the booster. That can cause failures in the booster, too.

 

[Mulochico]

If it was the vaccum pump wouldnt there be no suction at the hose.. or very very little?

My 1st thought exactly

 

[bagpiperjosh]

Ok so i replaced the brake booster, looks like the master cylinder will need replaced as well. It was a bit damp when itook it off. But my brakes work well now, they still make a hissing sound. I dont know if a bad master cylinder would still be causing that hissing or not

 

[icanfixall]

Was this dampness leaking down and rusting the booster... If so don't wait to long before you replace the master cylinder. That brake fluid is what destroys the diaphram in the booster.. Glad you found the problem. Good brakes are a must have item with these rigs.

 

[madpogue]

That brake fluid is what destroys the diaphram in the booster..

Sounds like it already has. The boost loss is just the coalmine canary; the real issue (although both parts will need R&R) is that now it's known that hydraulic integrity is lost, and the truck is not safe to drive. Any minor hydraulic leak can become a complete hydraulic failure with one push of the pedal. Good thing it was caught now.

 

[redneckaggie]

To check the vacum pump purchase a vacum gauge and connect it with a new hose to the vacum pump, should reach 21 in hg almost instantly upon startup, if that checks out fine test the hoses with a handheld vacum pump, if that checks out good tee a vacum gauge into the line and observe how well the system rebounds when pumping the brakes.

 

[bagpiperjosh]

Was this dampness leaking down and rusting the booster... If so don't wait to long before you replace the master cylinder. That brake fluid is what destroys the diaphram in the booster.. Glad you found the problem. Good brakes are a must have item with these rigs.

No one had it locally on hand. So ill order it tomorrow. I should have it on by thurs or fri. It didnt look to be leakig much

 

[icanfixall]

I have an oem aluminum master cylinder here thats new, 1 1/8 bore and not rebuilt. If you or anyone else wants it even just to have as a spare find out what Ford charges for it and make an offer. I really can't recall why I bought it other than it was another screaming deal I got. I use the hydroboost system with the 1 5/16 master cylinder.

 

[redneckaggie]

I had the exact same prob and went through lord knows how many mc's after I replaced the booster and it turned out to be the vacum pump. please check it at least

 

[bagpiperjosh]

the vac pump has good suction, i don't think that was the issue, i replaced the master cylinder because it was leaking, and after replacing both, my brakes work great! It must have been going bad since i owned it, because the brakes have never felt like this.

 

[redneckaggie]

Do they work fine even after pumping the pedal a few times. my pump felt like it was sucking good also. Just hate to see a post on here that you lost brakes again but this time wrecked the truck