EPB stuck on. Stranded. Happy days.

Johnmed · #1 14th June 2018, 01:06 PM

Near side EPB has given up and thrown the anchor down. Waiting for the AA currently. Tried cycling it and have no tools with me to pull the motor off/wind it.

Oh the joys. Not like I’m at work or anything....

mattylondon · #2 14th June 2018, 01:26 PM

One of the tools in the boot lid is apparently for emergency release of the EPB. Be careful with the widow maker jack. Disconnect the electrical connection before hand and get the AA to secure the cable as not to damage it when you're back driving. I think you remove the two bolts to free the motor off the caliper with this tool and then wind back the piston. The two bolts and the drive spindle share the same hex pattern so only one tool.

Johnmed · #3 14th June 2018, 03:07 PM

Cheers Matt. AA fella wound it back. I’ve tried to source a motor, as the caliper is fine. Can’t find a motor alone, our sponsors kindly gave me the part number:4e0998281b.

But they cost a lot on eBay, more than a refurbed caliper and motor from Euros.

Anyway, does anyone happen to know if an A6 Allroad’s motor would fit?

The part number is very similar, 4f0998281b. I’m tempted to have a punt....

Only stumbling block I can see is the wiring layout inside the connector is different.

steamship · #4 14th June 2018, 04:06 PM

Going by the illustrations in ETKA, they both look identical, but don't give dimensions. Looking on eBay however, the one for the A8 shows it with a short cable attached, whereas the one for the A6 just has a connector. I see what you mean by the cost difference, £270 for the A8 versus £29 for the A6.

Are you thinking of a straight swap or transplanting A6 motor into your current A8 casing?

Johnmed · #5 14th June 2018, 04:08 PM

Quote:

Originally Posted by steamship

Going by the illustrations in ETKA, they both look identical, but don't give dimensions. Looking on eBay however, the one for the A8 shows it with a short cable attached, whereas the one for the A6 just has a connector. I see what you mean by the cost difference, £270 for the A8 versus £29 for the A6.

Are you thinking of a straight swap or transplanting A6 motor into your current A8 casing?

Hi mate. I was thinking transplant the internals. Or if I could sort the wiring, avoid that. Maybe I’m mad.

steamship · #6 14th June 2018, 04:29 PM

Quote:

Originally Posted by Johnmed

Hi mate. I was thinking transplant the internals. Or if I could sort the wiring, avoid that. Maybe I’m mad.

Ah, wasn't sure about that previous wiring comment. Silly me thought that Audi would keep the wiring the same.

Johnmed · #7 14th June 2018, 06:11 PM

Quote:

Originally Posted by mattylondon

One of the tools in the boot lid is apparently for emergency release of the EPB. Be careful with the widow maker jack. Disconnect the electrical connection before hand and get the AA to secure the cable as not to damage it when you're back driving. I think you remove the two bolts to free the motor off the caliper with this tool and then wind back the piston. The two bolts and the drive spindle share the same hex pattern so only one tool.

All good advice Matt. I couldn’t see that tool, but I’ve previously wound the nearside caliper and could’ve again if I’d had the tools.

The AA man was a star. Patient, methodical and did everything right while having a chat. Got to drive the car and show my face at work again.

tc4332 · #8 14th June 2018, 08:24 PM

Good luck with this John.
I'll be watching for your result.
Shout if you need someone to watch you do it, might be able to fit a few minutes in between visiting times.

mattylondon · #9 15th June 2018, 08:30 AM

The A6 caliper is two wire, + and -, where as the A8 has a hall sensor and 4 wires in total. I guess the motor inside could be identical. I which I kept my old EPB to open up but I returned it to get the deposit back. The A6 uses 2.5mm cable and the A8 4mm. It worth taking a look to save some cash.

Johnmed · #10 15th June 2018, 01:00 PM

Quote:

Originally Posted by mattylondon

The A6 caliper is two wire, + and -, where as the A8 has a hall sensor and 4 wires in total. I guess the motor inside could be identical. I which I kept my old EPB to open up but I returned it to get the deposit back. The A6 uses 2.5mm cable and the A8 4mm. It worth taking a look to save some cash.

Cheers Matt. I was aware it had fewer wires. Hopefully I can fix my original one. Which was full of water, and seal it up. If not I’ll just replace the lot.

One bonus is I’ve just found and pulled the two 30 amp fuses (above battery) so now the EPB is disabled. A rather wonderful side effect of this being the warning noise above 5mph is also disabled!!!