My brakepads (a4 1.8ts quattro) are in okay shape, not new but they have a long way to go down to where the sensor cable is connected,.

My calipers started acting up and jammed, So I have changed them both, the discs also looked alright, , but even after changing the calipers, although it is not as bad as before the brakes in front especially on the passenger side is still partly jammed. The brake discs is as hot as a frying pan after driving only for a few minuets. Is there any logical explanation as to why this must be the case?

Why won't the fresh calipers let go completely after releasing the brake pedal?

any help is much appreciated

 

either the abs module acting up or your brake lines are bad. im guessing brake lines. youd just need to replace the rubber sections. if you want try upgradiong to stainless steel lines

 

thanks, strange thing is that the brake line has been replaced on the side that is acting up the most.

will replace on the other side also this weekend,

 

It is strange, but I have had to replace collapsed brake lines before. Change those out. Hopefully it fixes your problem.

Rather than just replace one at a time, I would replace the whole lot. If one has gotten bad enough to collapse, you can be sure that the others are not far behind.

 

Thank you, is it possible that one failed line can cause the brakes to jam slightly on other wheels as well, I have a failed abs sensor on the drivers side, but my problem is the passenger side were the line is brand new,

 

When the line collapses, it allows the fluid to move into the caliper when you apply the brakes, but does not allow it to return, causing the sticking that you mention.

A way to test if the line is bad is to jack up the suspected side and remove the wheel. (Use jack stands) The hub should be free to spin if the opposite wheel is also off the ground. Get in the car and mash on the brake pedal. No need to start the car, but really push on it. Now check to see if the wheel is free to spin. If it is not, open the bleeder screw slightly. You may want to have a rag handy, because if the fluid is not able to return to the master cylinder, it will be under pressure. Once the pressure is relieved, the wheel should be free to spin again.

Were the replacement calipers new or remanufactured? I've had some reman calipers turn out to be DOA. I don't see how a bad line at one wheel could cause trouble at another.

 

Bshusted has some very good advice here. The only thing I can think to add is to ask whether, when you put everything together (or during your work), if you cleaned and thoroughly greased the sliders. If they're corroded, they'll easily jam a caliper.

 

Thank you both for the advice you have provided. the calipers should be brand new,

I did put on some grease and they didn't look bad, if by the sliders you mean the metal pegs that connects the two pieces of the calipers together ?

I suppose I need to take a more thorough look though,

Thing is that if I remove the wheel and force the piston back into the caliper some by using a type of clamp, a small one that I can use without removing the caliper from the car. The wheel will spin nicely and the disc will not heat up. This leads me to believe that something is wrong with the calipers even though they are new, especially since the worst side is the one with the new brake line,

 

this is utterly hopeless,

I have changed both brake lines in front, the calipers are new,, I greased the pins thoroughly and put copper paste where the caliper needs to slide against the retainer four outer brake pad, it worked fine for a while, the discs only got moderately warm,

At the MOT inspection the inspector of course pushed the brakes to their maximum and as a result both discs in front are now once again heating up severely while driving as they are jammed for no apparent reason.

To make matters worse I bought the wrong ABS sensor, I need the one that is compatible with the wear sensors for the pads, anyone know the part number for it?

thanks everyone

 

Did you crack the bleeder to find out if it is the line pressure or the caliper itself? I know that you said you changed the lines, but perhaps there is still some blockage elsewhere in the system causing the problem.

Again, are they reman calipers or were they new oem units?

I can't help with the ABS part number.