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Topic Review (Newest First)
03-05-2012 05:37 AM
seniormaster check the caliper slides and be dang sure they are moving freely. they will sieze in the anchor plate and greatly reduce the stopping power.the abs unit sounds to be at fault, does it have a proportioning valve? the late 70's fords had the same problem, never figured out why.look at the 4 brake hoses, if any of them have a bracket crimped to them, spread the crimps a little, they rust and pinch the hose, causing high pedal effort.
03-04-2012 07:52 PM
Augusto yes the pads are brand new, original ford stuff, they already seated well and the discs are loosing the rough finish from the turning, I took them off, checked the wear pattern and is fine, cleaned it up with permatex brake cleaner and went back in bussines, same thing, no difference.

definitely something is reducing the fluid pressure and the only thing that could possibly do that is the ABS, seems like I must bypass it.

I'm still thinking of replacing the vaccum booster for a hydroboost, those things are powerful I have one in my C30 dually and is awsome.
03-04-2012 03:54 PM
T-bucket23 I never have but I am surprised that with 4 wheel disks that they are not stopping the vehicle bat are causing enough heat to effect the braking. Disk brakes are not usually prone to brake fade from just 1 or 2 stops.
The easy test is to bypass the ABS unit to see if it helps.
it seems to me that if you can make enough pressure to generate that much heat that the fluid is getting there. When you changed the pads were they work evenly
03-04-2012 03:48 PM
Augusto
Quote:
Originally Posted by Augusto
went to this hill yesterday and coming downhill I made several panic stops, the first one it slow down fairly well but took too long to stop, made a second one and it took soooo long, sure crash would of be if it was a real panic brake, third one I had to use both feet and almost bent the steering wheel, it took even longer to stop, carefully went back to the shop that's about half mile down the road and measured the temperature of the discs, pads and calipers, an average reading was 310 deg farenheit for the rear brakes and 290 deg for the fronts, this means that the pads are being applied and the bias is right, but maybe not enough clamping force? what would be a temperature reading after three very hard brakings?
nobody has ever measured the brakes temperatures?
03-04-2012 03:46 PM
Augusto
Quote:
Originally Posted by T-bucket23
If you have the 4 piston calipers you need to be sure all pistons are free. It is common for those pistons to freeze. For every frozen piston you will loose quite a bit of braking power.
itīs a 4 piston front, 2 rear system, but all move freely.

something is restricting full pressure from reaching the calipers? abs???
03-04-2012 03:44 PM
Augusto
Quote:
Originally Posted by firebird7980
Is the brake paddle hard when it won't stop or soft I have seen vac booster leak vac causing hard brake pedal on expedition
nope no hard or soft pedal, feels just right, tested several times the booster and is fine, I even changed the hose, check valve and the sponge air filter on the cabin side.
03-04-2012 03:40 PM
Augusto
Quote:
Originally Posted by Irelands child
Agusto - I'm 280 miles East of Buffalo. If you were to draw a line from New York City to Montreal, I would be about in the middle. I sounds like you have had at least one interesting trip to the US. It's a lot more then Disney - but heck, I enjoy a visit there every few years.

I don't think Ford did air suspension on the Expedition though Strutmaster offers a retrofit. Possibly yhere was an export model.

See the PM also.

Dave W
I'v been in Buffalo and Niagara, also most upstate NY, I love that part of the country, NY city is a must to visit, craziest place in the world I think, worth every single minute of stay there, but it would be the last place in the world I would choose to live in. I would love living in a farm anywhere in the northern USA though.

about the expedition, air suspension is a factory option, gives one of the best rides I ever had that were not in a german car, it has torsion bars assisted with air shocks up front and air bags only, no springs in the rear, it's great.
03-04-2012 03:23 PM
T-bucket23 If you have the 4 piston calipers you need to be sure all pistons are free. It is common for those pistons to freeze. For every frozen piston you will loose quite a bit of braking power.
03-03-2012 07:47 PM
firebird7980 Is the brake paddle hard when it won't stop or soft I have seen vac booster leak vac causing hard brake pedal on expedition
03-03-2012 06:44 PM
Irelands child Agusto - I'm 280 miles East of Buffalo. If you were to draw a line from New York City to Montreal, I would be about in the middle. I sounds like you have had at least one interesting trip to the US. It's a lot more then Disney - but heck, I enjoy a visit there every few years.

I don't think Ford did air suspension on the Expedition though Strutmaster offers a retrofit. Possibly yhere was an export model.

See the PM also.

Dave W
03-03-2012 06:29 PM
Augusto while on the shop waiting for a miracle on the brakes issue I decided to replace an aging rubber bushing in the left front shock absorver, only to discover that there's no way to remove the air hose from the shock, damn ford engineers, do they hate the mechanics? how do you remove an air hose that does not have a fitting or some sort of connector? the chilton book doesn't even mention air suspension in the expedition section... weird to say the least..!!
03-03-2012 06:12 PM
LATECH You could try replacing the ABS unit with another if you really want to keep it on the vehicle.
03-03-2012 04:36 PM
Augusto so Dave, you must be near Buffalo? I was there back in 2005, and things were different, at Disney World a guard checked our bags and stuff, was weird, at the airport they asked us to remove our shoes, a guy who complained was taken off the line, but I understood it had to be done, all this safety measures, anyway life must go on, I still think the USA is the best country in the world despite the things that changed, I hope this year I could visit the states again, I'm missing the food and the races, I must go to a NHRA race and a NASCAR in a big oval.

Back to the expedition, I'm thinking of removing the ABS unit but is a lot of work and will need to adapt the lines well most of the work will be done by one of my employees bu I still will have to do some, I don't like doing those jobs but you know... someone must do it I don't want to cut anything because if the problem persist I want the ABS back, this makes the job more difficult.

I'll post later when I have the job done, thanks everybody for helping.
03-03-2012 01:22 PM
Irelands child Agusto - with the smiley I thought you were - but sometimes over the internet, meanings get missed as one I have on another thread. I don't know when you visited the US last, but in many larger cities even many banks have metal detectors plus municipal buildings are heavily and armed guarded though in the town I live in, not yet though there is at least one security guy at the reception desk but he is there mostly to keep upset residents who have a problem quieted down - and I've never seen him agitated in the many meetings I attend .

9/11 is quite near to many local folks as we are only about 150 miles North. There were several local folks killed and even more that lost their jobs as this is within commuting distance for many even if it was only a weekly trip. Our GE office a block or so away was closed for several months for clean up with the staff working from home then from an alternate office. Life as we knew - changed a lot.

Now - back to the Expedition - I'm out of suggestions other then an ABS failure

Dave W
03-03-2012 01:00 PM
Augusto I know, I know, I was kidding, more people die in NY than in our whole country, but being serious US diplomats do take very high risks everywhere, probably in places where they migh feel safe they are not, say if I was a towelhead terrorist I would choose the US embassy in Ecuador which has less chance of being attacked than the US embassy in Iran for an attack, it would be more succesful over here, so I'm sure the american embassies are very well protected everywhere, and their cars must be protected also, things have changed a lot lately, I've seen now that the US ambassador here has a beautiful cadillac limo that I bet is heavily armored, getting inside the embassy to get a visa is now quite scary, armed guards, metal detectors, cameras, etc, the consulates are behind glass windows, man the 9-11 changed things a lot, damn towelheads did changed the world.
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