Master Cylinder Issues - Any thoughts?

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touch_reality
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Master Cylinder Issues - Any thoughts?

Post by touch_reality » 29 Dec 2017, 19:47

Hey all!

So been trying to bleed the old system which was completely replaced, All lines, hoses, calipers etc. Only thing that stayed was the ABS. I picked up a used M3 Servo and MC for use on the 330D brakes however it bleeds the clutch/front brakes fine but no fluid whatsoever comes out of the rear output port of the MC. I traced this back working from calipers to ABS then ABS to MC. I can put full pressure on the pedal with a full tank of fluid and it goes dead hard as front brakes apply however even with the only the front line in and full pressure on the pedal the MC doesn't spit so much as a dribble out of the rear feed port.

Ive seen about bench bleeding and I'm doing to try this tomorrow however could this spell a knackered MC?

Thanks in Advance!

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Re: Master Cylinder Issues - Any thoughts?

Post by M60NJP » 29 Dec 2017, 20:47

My money is on a knackered MC. Sorry.

touch_reality
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Re: Master Cylinder Issues - Any thoughts?

Post by touch_reality » 29 Dec 2017, 23:34

Yea that's what I'm betting on. New ones going to set me back a few pennies but hey ho the joys of project work :P

I'll update tomorrow if I manage to get it to sort itself

touch_reality
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Re: Master Cylinder Issues - Any thoughts?

Post by touch_reality » 31 Dec 2017, 09:36

Ok so arrived at the garage to find puddles of fluid at the rear. It only went and bled itself over night 😂 I'll be triple checking it to ensure it's working fine but apparently fluid is now exiting the mc

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Re: Master Cylinder Issues - Any thoughts?

Post by M60NJP » 31 Dec 2017, 09:50

touch_reality wrote:
29 Dec 2017, 23:34
Yea that's what I'm betting on. New ones going to set me back a few pennies but hey ho the joys of project work :P

I'll update tomorrow if I manage to get it to sort itself
BTW -guy just posted on our FB page, breaking an E46 M3...............might have the m/c?

touch_reality
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Re: Master Cylinder Issues - Any thoughts?

Post by touch_reality » 31 Dec 2017, 16:01

M60NJP wrote:
31 Dec 2017, 09:50
touch_reality wrote:
29 Dec 2017, 23:34
Yea that's what I'm betting on. New ones going to set me back a few pennies but hey ho the joys of project work :P

I'll update tomorrow if I manage to get it to sort itself
BTW -guy just posted on our FB page, breaking an E46 M3...............might have the m/c?
Not sure you can use the E46 M3 one. Last I checked could only swap to a E36 M3 one from the 3.2? Also it seems to have fixed itself from gravity bleeding soo I'm going to wait it out. Thanks for the heads up though!

touch_reality
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Re: Master Cylinder Issues - Any thoughts?

Post by touch_reality » 01 Jan 2018, 14:57

Panic over it fixed itself - Left the nipples off for a few days on the rears and it gravity bled itself through and works a treat now :)1

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Re: Master Cylinder Issues - Any thoughts?

Post by Metroreg » 01 Jan 2018, 15:09

touch_reality wrote:
01 Jan 2018, 14:57
Panic over it fixed itself - Left the nipples off for a few days on the rears and it gravity bled itself through and works a treat now :)1
Thats great news, :thumbup: :thumbup:
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Re: Master Cylinder Issues - Any thoughts?

Post by Matt N » 02 Jan 2018, 19:11

I've had similar issues before myself with a mate's MR2. Bled the whole car 3 times and couldn't get a pedal for love nor money; gave up and left it overnight and it was fine the next day.

touch_reality
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Re: Master Cylinder Issues - Any thoughts?

Post by touch_reality » 03 Jan 2018, 09:11

Matt N wrote:
02 Jan 2018, 19:11
I've had similar issues before myself with a mate's MR2. Bled the whole car 3 times and couldn't get a pedal for love nor money; gave up and left it overnight and it was fine the next day.
Yea Its a bit odd. However I did find out there's two methods to bleeding it when the systems completely dry one is bench bleeding which I tried however didn't have anything to really fashion into bleed tubes and two is the gravity bleed left for a few hours. Turns out I inadvertently gravity bled the system so happy days pedals nice and solid now with minimal travel.

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