2010 E70 X5 3.0d - Parking Brake Fault

Sm[]key · Post by **Sm[]key** » Thu Jun 13, 2024 3:41 pm

Unlocked car this morning and a loud crunching noise came from rear driver side of car. Lasted for a few seconds.

Start ignition, fault lamp came on and the parking brake wouldn't disengage.

Cleared error codes, did pedal reset still no change.

Pulled the emergency release in boot and that released the parking brake.

Does anyone know if this is safe to drive now released?

I have a long journey to make tomorrow, will I have a problem?

IanP · Post by **IanP** » Thu Jun 13, 2024 8:36 pm

Mine had the nasty habit of re-engaging even when it was off

X5Sport · Post by **X5Sport** » Thu Jun 13, 2024 8:54 pm

You could try taking the fuse out? That’ll stop the actuator unit pulling the cables. The actuators had a poor reliability reputation early in the model’s history but I thought that had been overcome. Not seen a failure reported for years.

Do not be tempted to buy a knock off replacement as they often don’t work properly, don’t clear the fault, or just are rubbish. Refurbed OEM may be expensive (though still cheaper than buying from BMW who want about a grand for a new one).

There were repair kits around but I haven’t looked recently.

Leslie · Post by **Leslie** » Thu Jun 13, 2024 8:56 pm

if its released it should stay of until you try and operate it again id have thought but the danger is it isn't fully released on that side but park brake is separate from rear caliper on these like older bmws .

Lobster Pot · Post by **Lobster Pot** » Fri Jun 14, 2024 4:43 am

Mine went couple years ago drove it for ages until I finally took it to a chap in Southport who repairs them had a walk into town had fish and chips walked back and all repaired and working again

think it was around £350 obviously cheaper if you send him the part and fit yourself there’s also another in Bradford who does the same

marti · Post by **marti** » Mon Jun 17, 2024 1:34 pm

If your hands on the actuator unit is really easy to do, you have to remove it to change the the rear pads and it only a matter of unpluging it and pluging a new one in.....disconnect battery first so you dont get any errors....

Sm[]key · Post by **Sm[]key** » Tue Jun 18, 2024 2:41 pm

I got one off eBay for £100.

Took me a number of hours on Sunday to changed out, replaced discs / pads / shoes too!

Fitting the emergency release in the boot is a two man job btw!

I`m yet to open up the old unit due to corroded bolts, will drill them out to see what had failed!?

X5Sport · Post by **X5Sport** » Tue Jun 18, 2024 5:27 pm

Probably a plastic gear! Why manufacturers insist on plastic for ‘high load’ items I just don’t get

Leslie · Post by **Leslie** » Wed Jun 19, 2024 8:14 pm

Think the brushes in the motor wear out too and see motors for sale on ebay but no idea if they would be good or not .

Sm[]key · Post by **Sm[]key** » Fri Jun 28, 2024 8:58 pm

: WhatsApp Image 2024-06-28 at 20.54.08_f1321bbd.jpg (184.11 KiB) Viewed 3181 times

Took apart old hand brake mechanism, plastic gears seem ok. Hear a loud grinding sound when it failed.....

X5Sport · Post by **X5Sport** » Fri Jun 28, 2024 9:20 pm

As you say, the gears look OK. The second reduction gear is dirty, but that’s probably from the retaining spring. The teeth all look pretty good. Curious if there’s any backlash or wear that would allow any of the three gears to jump rather than engage?

Parking brake cables OK?

It’s only the motor left if those two are fine.

Sm[]key · Post by **Sm[]key** » Fri Jun 28, 2024 10:19 pm

Yeah cables ok, couldn't see any visible damage or play.

My conclusion was the motor failed....

Leslie · Post by **Leslie** » Sat Jun 29, 2024 10:38 pm

The motor maybe has some sort of coupling which has failed at a guess .

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