XSeries-forum

Car back on the road after brake failure repairs - and, with the invaluable advice of members and the 'how-to' guides, have also successfully changed the air filter and breather vortex and thoroughly de-tished the egr - result:-

- nice smooth tick-over
- reduced lag
- no more black smoke (and acute embarrasment!) on hard acceleration

What was the final diagnosis for the brake issues?

[quote=""X5Sport""]What was the final diagnosis for the brake issues?[/quote]

I suspect the cause of the evident pitting corrosion may have been chloride-ion leaching from the plastic pipe clip (I can't think of any other credible explanation) - this would point to the clip having been made from a poor quality polymer wherein not enough catalyst has been added to polymerise all the (chlorine containing) monomer

Bloody hell, that's a somewhat technical answer.
I do hope that is your line of work or are you just the greatest pub quiz buddy of all time????


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[quote=""rusty nail""]Bloody hell, that's a somewhat technical answer.
I do hope that is your line of work or are you just the greatest pub quiz buddy of all time????


Sent from my iPod device using Tapatalk[/quote]

Yup - line of work - but maybe worth remembering as a spoof pub quizz general knowledge question ("What is the polymer-leachable anion liable to cause acute corrosion of steel brake pipes on a BMW X5")

You mean......it went rusty..

who did your brake pipes im still having issues with mine

[quote=""shadrack""]who did your brake pipes im still having issues with mine[/quote]

I renewed the long sections of the pipes to the rear calipers that run through the nearside sill (the rest of the brake pipework on the car was OK) - did the job myself using 3/16" cupro-nickel replacement pipe + UNF barrel connectors - and with the aid of a Seally UNF/DIN on-car flaring tool

Having replaced the pipes, I could only bleed the front brakes as the ABS unit valves to the rears had clearly closed when all the fluid had been lost from the unit due to the original leak. Had to take the car to my indie to get the rears bled - he used a TIS routine to cycle the ABS pump and valves whilst bleeding the rears - took him two complete bleeding cycles (round all four calipers) and 2.5 litres of fluid before all was well

Before I got the rears bled, I had only front braking effect and excessive pedal travel.