no brakes

[stingray]

well since no one bothered to answer my last post probably because no one has an answer on how to fix the problem. maybe someone will have the know how to answer this one. my friend has a 2000 ranger, 4wd, 4.0 litre that the brakes go to the floor, he has replaced master-cylinder (bench bled) booster and check valve,both front calipers,both front hoses(rubber)and brake pads,rear wheel cylinders(both) new rear shoes,spring kits. hose from intake to booster has also been replaced. all 4 corners have been bled. went through 6 yes i said 6 32 fluid ounce bottles of fluid bleeding system and still pedal goes to floor when engine is running. pedal is ggod and hard when engine is off but as soon as it's running pedal goes to floor. if anyone has the know how or has been in this situation before any help would be appreciated. are there any good mechanics on this site or just alot of wanna be's?

 

[alain]

Wow, that'a a lot of new parts... There air somewhere in the system, unless a part is defect. Try to bleed it again.

 

[JamesC]

With the engine off does the pedal sink at all?

Does this truck have Abs?

Was the start of this problem that the pedal went to the floor or was it something else and now it goes to the floor?

 

[martin]

wrong attitude.

 

[dennis461]

wrong attitude.

x2

Sounds like the rear shoes are too loose.
Raise rear, manually adjust the shoe tighter while rotating the tire.
Should be hard to turn.
Do both sides.

If pedal is high and tight with engine off, then sinks with engine running, than most everything is probably done right.

One last thought. Does the truck have extended rubber brake lines?

 

[Sasquatch_Ryda]

x2

Sounds like the rear shoes are too loose.
Raise rear, manually adjust the shoe tighter while rotating the tire.
Should be hard to turn.
Do both sides.

You should just feel slight drag, it should not be hard to turn.

 

[kcm1582]

x2

Sounds like the rear shoes are too loose.

Agreed sounds like the rear shoes are out of adjustment.

The way I was taught to adjust them was that they are right when you can spin the wheel and the tire will turn 1.5 - 2 revs before stopping.

 

[cocoasranger]

You mentioned that the booster was replaced. When you put the new one in the booster actuator rod has to be adjusted to proper length or the brakes won't work properly. Also, if you put in 6 quarts of brake fluid, you may have a broken steel line (but I would think there would be quite a large puddle of fluid under the truck if that were the case.

 

[Twisted_Steel]

Where is 6 quarts of fluid going? If there are no puddles, you need to check the engine oil. The vacuum will pull the fluid into the engine. Had a similar problem when the modulator valve went bad on an older vehicle... drained the trans fluid.. right into the oil pan.

 

[kcm1582]

I think he just used that much bleeding air from the system.