E46Fanatics - View Single Post - Any DIY for changing brake lines
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Old 11-15-2012, 09:31 AM   #7
Registered User
Join Date: Mar 2009
Location: CA
Posts: 131
My Ride: M3 ZCP, 335is, 330ci
Ok so I did this job last night and can pass on a few words of wisdom for the next who hopefully searches and finds this.
Use PB Blaster, great stuff

The order to remove:
-Remove middle attachment (bracket for rear and rubber grommet for fronts
-Break loose the connection at the caliper but don't unscrew (you can't anyways as the whole hose turns with this fitting)
-Break loose and unscrew the connection at the car side hard line
-Once hose is disconnected at this end you'll get a slow drip of fluid out so have catch pan ready
-Turn whole hose to unscrew connection at caliper
-Install in reverse order

For my 2004 330Ci (a little different from the M3 in the DIYs above):
The caliper side connection required a 14mm flare wrench (felt like a regular crescent might've worked but why risk it )
The hard line from the car was a 11mm flare
The OEM line mating with the hard line was a 17mm square so flare/line wrench wouldn't work but a standard crescent worked fine since it's really just holding it while you unscrew the 11mm flare nut.
My new Bimmerworld V2 lines were 14mm flare on both ends making that easy and fit very well. Front lines were ~3/8" longer than OEM but actually made the routing better with the hoses entering the fitting straight on instead of pulling to the side.

I also used my Motive bleeder (without pressure) on the reservoir to reduce the flow through while the line was off and but still got ~1 drip/sec. Bled it all with the new lines and have a nice firm pedal and fresh fluid. I did this more for the track than anything else and we'll see what the actual improvement is this weekend.
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