X5 Braking Issues

[greeny]

Had the front brakes lock on the car today, all the brake warning lights came on, by the time I pulled, slowly, into somewhere safe, disks were smoking hot!
While waiting for the AA, lights went off and the brakes freed off, and l carefully drove home with the AA man following me. Brakes did not seize on again, but the pedal does not seem right, fine if you stamp on them, but if you push slowly, pedal goes really long, but brakes still work.
Reservoir full, one brake pipe replaced recently.
Any ideas?

[X5Sport]

Sounds like no leaks present.  What was replaced?  BMW Dealer/Indy or DIY?

When the pipe was replaced and the system was bled, was the ABS Modulator also bled?  If there is any air in that unit it can cause odd things to happen.

You can bleed the system either with the pedal up/down routine, or pressure bled as long as you stay below 20psi on the pressure source.

It needs special equipment to bleed the ABS unit though as all the valves have to be cycled in the right order which needs a computer plugged in.

Richard

[greeny]

Thanks Richard, work done by an Indy. Car is stuck there over the weekend, I will pass on your comments on Monday morning. I was a month ago the pipe was replaced, so not sure if there is a connection.
AA man thought servo or master cylinder.
Daniel

[greeny]

Master cylinder changed, problem solved  ::)