Brake fluid change

jparnes1 · 10-20-2014, 06:54 AM

Planning to do a brake flush and came across some additional info while researching the clutch delay valve. For those of us with an MT, apparently the clutch slave cylinder gets fed hydraulic fluid from the master cylinder. Has anyone flushed the slave cylinder along with the brake lines? Does this need to be done?

bigendbob · 10-22-2014, 12:44 AM

When i removed the cdv i needed to bleed the clutch line. The fluid ran quite easily without pumping the clutch pedal.
One would assume if you want to do the job right then if you can get under the car, bleed the clutch also.
Be interested as to how you get on with the brake lines. A job i have been putting off for a while. I planned on draining the reservoir and filling, then bleed just using gravity at each wheel, after a local mechanic suggested not too pump the pedal.

DKZTT · 10-22-2014, 02:41 PM

I recently changed my brake fluid using European Power Bleeder. Very useful if you are going to be doing it by yourself, helps by making it air tight to prevent air getting into your brake system and pushes the all the old fluid out using the new fluid.

jparnes1 · 10-22-2014, 05:34 PM

I use a pressure bleeder too. makes quick work of it and you get no air in the lines like you can by pumping the brake pedal.
I recently came across some info saying that it's not necessary to flush the clutch slave cylinder because, unlike the brake where increased water absorption can lower the boiling point of the brake fluid and decreasing the braking efficiency, the slave cylinder is unaffected by this. So until I hear differently, I'm just doing the brakes.

rking117 · 10-24-2014, 09:57 AM

Where does one get a pressure bleeder?

paris1 · 10-24-2014, 10:06 AM

Probably one of the most complete lines: http://www.brakebleeder.com/product-...rake-bleeders/

jparnes1 · 10-24-2014, 01:25 PM

Quote:

Originally Posted by rking117

Where does one get a pressure bleeder?

I like the one from www.bav.auto.com. They sell a catch bottle with a rubber attachment that fits the bleeder valve very nicely. I just ordered it a few weeks ago and the catch bottle was free with the bleeder. Maybe you can still get that promo.

bigendbob · 10-25-2014, 01:21 AM

Thought about using two lengths of rubber, a jam jar and foot pump.
Someone mentioned a system using the air from tyre/tire.

10-20-2014, 06:54 AM	#1
jparnes1 Colonel 241 Rep 2,387 Posts Drives: 2016 340i, 2012 Z4 35i Join Date: Jan 2010 Location: NY iTrader: (1)	Brake fluid change Planning to do a brake flush and came across some additional info while researching the clutch delay valve. For those of us with an MT, apparently the clutch slave cylinder gets fed hydraulic fluid from the master cylinder. Has anyone flushed the slave cylinder along with the brake lines? Does this need to be done? __________________ 2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus. 2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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10-22-2014, 12:44 AM	#2
bigendbob Second Lieutenant 50 Rep 297 Posts Drives: z4 23i Orion Silver Join Date: Jun 2012 Location: west midlands iTrader: (0)	When i removed the cdv i needed to bleed the clutch line. The fluid ran quite easily without pumping the clutch pedal. One would assume if you want to do the job right then if you can get under the car, bleed the clutch also. Be interested as to how you get on with the brake lines. A job i have been putting off for a while. I planned on draining the reservoir and filling, then bleed just using gravity at each wheel, after a local mechanic suggested not too pump the pedal.
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10-22-2014, 02:41 PM	#3
DKZTT Private First Class 21 Rep 125 Posts Drives: BMW Z 35i Join Date: Jul 2013 Location: ATX iTrader: (0)	I recently changed my brake fluid using European Power Bleeder. Very useful if you are going to be doing it by yourself, helps by making it air tight to prevent air getting into your brake system and pushes the all the old fluid out using the new fluid. __________________ Cobb AP3 map Stg2+FMIC LT Aggrssv:::ER FMIC & ChargePipe w HKS BOV:::AFE Stage 2 sealed ARDesign Downpipes w race cats:::Eisennman Quad Race:::KW V1:::M3 Control and Thrust Arms
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10-22-2014, 05:34 PM	#4
jparnes1 Colonel 241 Rep 2,387 Posts Drives: 2016 340i, 2012 Z4 35i Join Date: Jan 2010 Location: NY iTrader: (1)	I use a pressure bleeder too. makes quick work of it and you get no air in the lines like you can by pumping the brake pedal. I recently came across some info saying that it's not necessary to flush the clutch slave cylinder because, unlike the brake where increased water absorption can lower the boiling point of the brake fluid and decreasing the braking efficiency, the slave cylinder is unaffected by this. So until I hear differently, I'm just doing the brakes. __________________ 2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus. 2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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10-24-2014, 09:57 AM	#5
rking117 Lieutenant Colonel 118 Rep 1,668 Posts Drives: Z4 3.0i & 320i Join Date: Aug 2012 Location: USA iTrader: (0)	Where does one get a pressure bleeder? __________________ Enjoying an E89 Z4, F30 320i and Fiat Abarth // E85 Z4 (sold), E82 128i (sold), Fiat Pop 500 (sold)
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10-24-2014, 10:06 AM	#6
paris1 Captain 90 Rep 745 Posts Drives: 2013 35i Space Grey over Coral Join Date: Oct 2014 Location: Northern Calif. iTrader: (0)	Probably one of the most complete lines: http://www.brakebleeder.com/product-...rake-bleeders/
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10-25-2014, 01:21 AM	#8
bigendbob Second Lieutenant 50 Rep 297 Posts Drives: z4 23i Orion Silver Join Date: Jun 2012 Location: west midlands iTrader: (0)	Thought about using two lengths of rubber, a jam jar and foot pump. Someone mentioned a system using the air from tyre/tire.
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