We have an R-reg Isuzu Trooper which is only really used for towing a horse box.   We recently had some new front calipers fitted as the old ones were the originals and had seized slightly, so were not working very well (garage had free'd them off and greased a couple of times, and they worked for a while each time, so decided to replace).

When the calipers were fitted, bled etc, brakes were really bad - you could push the pedal to the floor almost when braking relatively hard.   Garage bled again, no change really.   He said that the master cylinder was probably on its way out - seals had gone, which made sense to me, so he replaced that too.   Now brakes are a little better, but not brilliant.

He has bled them again, but now, when you brake, the pedal is very long, but if you push the pedal once quickly, then brake as normal, the pedal feels very good, and brakes are fine!

Anyone got any suggestions as to why you need to press the pedal twice to get a good response from the brakes?

Any input much appreciated - when we are towing, it is usually two large horses + trailer, which is about 2.5 tonnes, so decent brakes are quite nice to have really!

Thanks,

Al

Simply put there is still air in the system, an old trick from way back which is worth trying when its difficult to remove air sometimes is too prime the pedal several times, in other words pump it quite briskly for a few times, and then slip in a prop between the pedal and the edge of the seat, or where ever, so there is constant pressure on the pedal, not to much just enough to keep it in position. Leave it say overnight in this position and the following day remove the prop and try the pedal, hopefully you should now have a full pedal.

What you are actually doing is allowing any air in the system to rise to the top over a period of time.!!!