Some help please guys...

Just put some front brakes on my cossie focus, AP 4 pots 5200 and 330mm disks, unsure of what pads they are but they've got M1155 4143M1 wrote on them. Also just fitted a bias pedal box, new cylinders, ressy's and braided hoses. Took the car out today and about a mile up the road the front brakes seized on, after about ten mins when the brakes cooled down they unseized and where fine. Turned around and headed home and by the time I'd got back when them warmed up again they seized up. Any ideas as to whats causing this....please!!!!!

Thanks

Rich

 

How much fluid do you have in the reservois bottles ?

 

it's filled to the max level...

 

Couple of things to look at

Is the cap of the reservois bottle breathing correctly ?

Any brake hoses kinked ?

Is it doing it all the time ?

Once the system becomes pressurised you need to find out where the pressure is held by cracking open some of the joints.

If you undo the bleed nipple and it fixes it the pressure is in the caliper, if you undo the brake hose the pressure is in the line, and if you undo the reservois end the pressure is in the master cylinder.

Only then can you start to work out whats happening where

 

Only seems to be doing it once the brakes have warmed up a little probably after a mile of driving. Checked the hoses and none are kinked. I've checked the ressy and it seems to be breathing ok, i can blow throught the hole in the cap, and they brakes stayed seized even when i took the lid off. The only way of unseizing them was the crack the nipple off on the caliper. The feed line from the ressy to the master cylinder is quite long and is in a kind of u shape at the back of the bulk head, I'm going to shorten it and see if that makes any difference.

I'll keep you posted, thanks for your help so far!!

Kind regards

Rich

 

changed the master cylinder and the problems seems to be cured, cheers for your help

Rich