[TGMcCoy]

Dang!! I had one of my fully forged rears(2+ months old) 22x12 crack in 3 different places. We've got bad roads here as well in some places. What PSI do you run? I was curious if running a little lower would soften the blow

[Ninefourteener]

Originally Posted by TGMcCoy

Dang!! I had one of my fully forged rears(2+ months old) 22x12 crack in 3 different places. We've got bad roads here as well in some places. What PSI do you run? I was curious if running a little lower would soften the blow

No.. I've run them as low as 40, and as high as 50. Doesn't seem to matter.

The roads here in Southern Belgium are worse than war-torn Afghanistan roads... The worst I've ever seen.

....And this is coming from a guy that has been to 45 of the 50 states, and over 70 countries in his life.

Washington DC? LA? Philly? They've got NOTHING on the shitterific roads in Southern Belgium.

Hell... I took a 14-day road trip on the motorcycle through 8 countries in the Balkans last Summer.... Even BOSNIA & KOSOVO have better roads than Southern Belgium.

[TGMcCoy]

Wow! I guess the weight of the X5 and potholes... it may be bound to happen. Crossing fingers to last more than a couple months this time. And I upsized the ratio 275/40 315/35 to maybe help with this and this is exactly when the crack happened

[erix920]

Thank you for the pics and details on the front and rear diff fluid change! Hopefully the royal purple has some added protection. Pretty sure my front diff is shot at 77k miles on my m50 (bought the car second hand).

[Ninefourteener]

Originally Posted by erix920

Thank you for the pics and details on the front and rear diff fluid change! Hopefully the royal purple has some added protection. Pretty sure my front diff is shot at 77k miles on my m50 (bought the car second hand).

I wouldn't say it's "shot". It depends. I was beginning to notice a bit of "shuttering"... particularly in reverse.... with the wheels turned either direction.

I changed the xfer case fluid... and the problem is GONE.

Now... I imagine that had I continued to drive like that for an extended period of time? Yea... I would have thrashed my xfer case.

All the experts say to do it at 50k miles. Yet, BMW says to do it at 100+k miles.

I trust the experts. It's $40 for the fluid.... it's worth the investment.

The diffs?? Ehhh... I just did them because i happen to be under the car. I figured, why not?

[Ninefourteener]

Car wash day. Can't believe I've had this thing almost 5 years now.

[vstrong50]

Originally Posted by Ninefourteener

Car wash day. Can't believe I've had this thing almost 5 years now.

Man that looks amazing! So clean.

[lamer]

Hi.
I'v read the whole thread and I am impressed.

I would like to make brakes swap in my x5 so I have a few questions.
Was there any coding needed after brake calipers swap?
Is there any problem with vent the brakes after replacing the clamps? Does it require a computer or do we do it classically?

Greetings from Poland!

[Ninefourteener]

Originally Posted by lamer

Hi.
I'v read the whole thread and I am impressed.

I would like to make brakes swap in my x5 so I have a few questions.
Was there any coding needed after brake calipers swap?
Is there any problem with vent the brakes after replacing the clamps? Does it require a computer or do we do it classically?

Greetings from Poland!

Thanks!

No, I did not do any coding at all. It was all a direct mechanical swap.

I did however, make one very critical mistake: When I was changing the front calipers, they keyfob must have been too close to the car, and the car "woke up" when I was bleeding the caliper.

The ABS pump went crazy - Started pumping fluid all over the place, and then threw every warning light that the car had to offer.

Even worse - the car STOPPED SENDING FLUID to the right front caliper, which made for a VERY dangerous driving.

"Mechanically", I did everything perfectly. However, the computer recognized "something' went wrong, and it was VERY unhappy with me.

I brought it to a technician... he cleared all the faults in 10 minutes, and the car has been fine since then. Zero mechanical work - everything was perfect.

Make 100% sure the car is "off" when you do brake work. In fact... just disconnect the battery, and make sure your key is FAR away.

[lamer]

Originally Posted by Ninefourteener

I did however, make one very critical mistake: When I was changing the front calipers, they keyfob must have been too close to the car, and the car "woke up" when I was bleeding the caliper.

The ABS pump went crazy - Started pumping fluid all over the place, and then threw every warning light that the car had to offer.

I'm glad you answered.

A familiar BMW ASO employee warned me against this. I didn't quite know what he was talking about.
If I remember correctly, he said that when I open the door (?), the ABS pump would push the piston.
I have the Bimmer-Tool app and OBD Interface. There is the "brake assembly mode" option. It probably prevents this problem.

[Ninefourteener]

Originally Posted by lamer

I'm glad you answered.

A familiar BMW ASO employee warned me against this. I didn't quite know what he was talking about.
If I remember correctly, he said that when I open the door (?), the ABS pump would push the piston.
I have the Bimmer-Tool app and OBD Interface. There is the "brake assembly mode" option. It probably prevents this problem.

I'm not sure. I'm old-school, and I can turn a wrench better than anyone I know... but computers, coding, etc.... manages to elude me.

I've replaced the front calipers, then reverted back to stock, then re-replaced the front calipers again (3 times total)... all without coding.

I've also replaced the rear calipers without coding. I've also manually turned back the rear e-brake without coding.... no issues with anything.

Until one day... I had an issue:

I installed the rear BBK... new calipers, rotors, separate e-brake calipers, 4-piston braking calipers.. took it out for a drive... no problems whatsoever.

Then I switched to the front (much easier and less complicated). Replaced the driver side caliper/rotor... bled the brake... no problem.

Got to the passenger side..... got everything installed.... and then when I went to bleed it, the ABS pump kicked in like CRAZY... and pumped nearly a quart of brake fluid out the bleeder valve. It didn't stop pumping fluid until I closed the bleeder. I re-filled the system, re-bled, and "mechanically" everything was fine....

But it threw every warning light you can imagine. Not joking, it was giving me like 6 different warning codes, all over the dashboard..... and it electronically killed power (fluid flow) to the passenger side front caliper. Made it VERY dangerous to drive. The car pulled HARD to the left, and it took twice as long to stop the car. It was VERY dangerous to drive that way.

Took it to a local (non BMW) tech that specializes in BMW tuning. He cleared the codes, and everything has worked 100% perfect since then. He didn't even need to re-bleed. Everything "mechanically" I'd done was 100% perfect... but the computer was VERY angry with me about it - LOL

Hope this helps.

[angus.cottman]

Hi All,

Wondering if any of you lads know where to find internal engine specs such as Main bearing, rod bearing and journal sizes for this engine?

Tired calling main dealer and BMW AUS plus various BMW service deps but they all failed.

Thanks in advance!

[Ftpohyeah]

great pair of cars you have, that 4c looks amazing!!! I've only had the pleasure of seeing and hearing it in the wild.