Tarago Brake Pressure Fade - PLEASE HELP :)

Well, for the record I am a mechanic and Duncs in right on the money. Sounds very much like a master cylinder problem.

The only other thing I'd be suspicious of is the brake calliper. You say you did the wheel cylinder......on disc brakes???? Mmmmm.

You also failed to mention if the van has ABS. If it does, it may be an issue with the ABS pump or circuits within. Guessing it doesn't because you say the other three wheels lock up.

If it were my car, I'd check the pressure at the master cylinder. Blow the lines out from the master cylinder down to the calliper with compressed air and flush through with some meths.

Clean the disc thoroughly to remove any oil or grease, and have a proper look at the calliper. No disrespect but for you to be asking for advice on this subject, I take it you're not a mechanic and so what you believe to be an overhaul of the calliper, might be nothing more than putting a band aid on a broken back.

As stated further down this post, not getting the brakes right could well kill you, your family or some other poor soul. Are criminal negligence charges and a criminal record cheaper than taking the car to a mechanic?

Sorry, but it really yanks my chain that you need a licensed electrician to put in a power point to save your own skin from getting zapped, but any Joe Blogs can stuff around with brakes on a car which has the potential to kill many more people. Stick to engine repairs, the worst that can happen there is that the car stalls or fails to start.

Take your vehicle to a workshop that specialise in braking systems or the brand dealer.

It is plainly obvious that you are out your depth.

With all this playing about, it would appear that you are driving/testing your vehicle on public roads, if so you are placing other peoples at risk of injury or death.

You may find my reply offensive, however I spent too many years in the motor trade and the brake trade in particular to not call it as I see it.

Braking systems in today's motor vehicles are incredibly reliable in comparison to those of years ago, however the downside is that when things go wonky they can be extremely hard to diagnose. If you don't actually know what you are doing then don't try to guess it. How would you feel if your airline pilot posted hear asking advice as to get the plane back down on the ground?

It never ceases to amaze me that some people will fool around with systems that have the potential to kill themselves or others but when for instance, the TV, fridge or washing machine carks it, they just go out and buy another.

nah mate.. it happened in the garage and it hasnt left the driveway or the 30 meter strip of road in front of my house for testing fixes.. we have another car we fit everyone into so its not been a drama. just dragging on a bit long now...