Z3 brake issue, Teves MKiv.

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HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Post Thu Sep 24, 2015 7:28 pm

Afternoon all.

Got a bit of a brake issue that is driving me up the wall now. Just had to overhaul the rear brakes and in the process air quite obviously got into the system, my brake pedal before hand was about an inch or two higher than the accelerator and now after a couple of bleeds it is still soft and bites level with the accelerator pedal, so I know it's not in my head. :dunce:

To bleed them I have bled it one with the pressure bleeder, one with the pressure bleeder activating the ABS via pins 30/87 on the ASC relay (as advised for the E36), once using INPA to activate the ABS solenoids and once again manually/with assistance from the pressure bleeder. In total I have put 2l of fluid through the system. I have also given it hell activating the ABS on a quiet road last night to stationary several times before bleeding it again today.

The car stops fine but the pedal feel is just shite and soft. It seems to bite in the same place as before but has an additional 2" of spongy travel.

The Internet would suggest that there is air in the ABS or lines, but I just can't see how this can be now. The only thing I have not done is the bleed procedure via DIS as I have not set it up yet.

Anyone got any ideas before I drive the thing into a hedge and leave it there? :head: :evil:

Edit - just to quantify, overhaul was a new RL caliper and a complete set of new lines at the rear from the hard lines that run under the car back, hand brake was done as well. Driving me nuts as i have the same brake set up on the E30 with no issues at all, bleed just fine first time.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
DanThe
E30 Zone Team Member
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Location: Staffs

Post Fri Sep 25, 2015 8:54 am

I find squeezing the calliper pistons in from fully extended can help remove air if its trapped up near the ABS
HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Post Fri Sep 25, 2015 8:02 pm

I was going to give that a go, wondering if there was an air bubble in the master that would not shift.

Seems to be ok now today despite being shite last night.

I got nothing.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&