Brake Fluid Flush Procedure w/Pics - Page 2

jpitman2 · 12-01-2008, 01:25 AM

Fabulous, just what I need, doing it next weekend!
jp 83 Euro S AT 51k

Mrmerlin · 12-01-2008, 01:35 AM

make sure that you have a an additional hole (small) drilled into the top of the catch can otherwise you will be pressurizing it and then when you remove the hose from the bleeder the fluid will push out from the pressurized bottle

jpitman2 · 12-01-2008, 01:38 AM

Thanks, duly noted.
jp

Lizard931 · 12-01-2008, 04:04 AM

I used one of these and was not overly impressed with the pedal feel afterwards, and while I did everything the same, when I went back to the old 2 person method the brakes felt much much better after and I did see some air come out. But I was working on a practically dry system.

As to brake fluid do not run DOT 5 unless you flush everything out and replace all seals.

You can however run DOT 5.1, 4 or 3
DOT 5.1 is compatible with DOT 3, and 4 systems but has a much higher boiling point. I run wilwood 600+ in one car, and wilwood 675 in the other cars. I find that I have much better pedal feel and even with the 575 in the car, I experianced ZERO brake fade on a track that every other 928 that has run has seen fade.

Good post btW Dwayne.

jon928se · 12-01-2008, 04:41 AM

Dwayne - you must be getting bored of the adulation by now. Usual in depth quality.

I was disappointed that havin bought 20ft of clear hose you didn't figure out a way of bleeding the brakes while sitting having dinner or watching TV LOL.

Quote:

Originally Posted by Lizard931

I used one of these and was not overly impressed with the pedal feel afterwards, and while I did everything the same, when I went back to the old 2 person method the brakes felt much much better after and I did see some air come out. But I was working on a practically dry system..

It sometimes helps to leave the pressure bleeder hooked up and flowing then give the pedal a quick pump down but slowly back up so that the MC refills from the bleeder.

Quote:

Originally Posted by Lizard931

As to brake fluid do not run DOT 5 unless you flush everything out and replace all seals.

You can however run DOT 5.1, 4 or 3
DOT 5.1 is compatible with DOT 3, and 4 systems but has a much higher boiling point.

+1 to all that Liz. Good to dispel the confusion.

marton · 12-01-2008, 06:57 AM

Great write-up

Did mine earlier this year with same Motive Power bleeder & dot5.1; pedal is really hard now.

Only extra point I would add is do not use too much force when undoing the bleeder nipples; they are not hard to break... Maybe squirt them with some easing fluid an hour or two before you start.

Marton

Xlot · 12-01-2008, 07:26 AM

Nice write-up as ever.

When I did mine, I also bled the master cylinder - there's a bleed nipple on top of it, just below the reservoir, pointing up.

John Veninger · 12-01-2008, 08:09 AM

Nice write up.
The blue hose for the manual cars can cause a real mess and will blow off at around 15psi if it is fairly old.
Sometimes first hand experience is NOT how you want to learn.

Keeping it at 10-12psi and there shouldn't be a problem.

Mrmerlin · 12-01-2008, 02:03 PM

the reservour will come off the master with about 20 PSI, it launches like a rocket

LeoDioxide · 12-01-2008, 04:58 PM

You are my hero.

bfellows · 12-01-2008, 05:22 PM

Dwayne, you the daddy! Thanks for another great write up!

Tom in Austin · 12-01-2008, 05:44 PM

I like the tips for removing the bleeder when finished. The way I do it is to lower the power bleeder over the fender until it rests on the ground; i.e. lower than the master cylinder. Then, when I gradually loosen the cap on the reservoir it seems to suck excess fluid back down into the power bleeder, and I only have to do a little final topping off to get the level correct.

Something others may have noticed too ... if you wiggle the bleeder screw the least bit while the fluid is escaping you can get a long string of tiny bubbles. I think these come from the screw vicinity and not from the lines, but I ran a ton of fluid through waiting for these to stop. Also, if you're bleeding after opening the system, like for example, re-installing a caliper, it can take a long time to get all the air out of the lines. I tend to overkill and buy too much fluid to be sure I get all the bubbles out.

One other note, I believe it's true after opening the system, you are supposed to re-bleed after driving the car and engaging the anti-lock system a few times. Some air can apparently get trapped in the antilock plumbing and it has to escape out into the main lines in order to be bled out.

No doubt, the Motive is a handy tool and beats the heck out of any other way of doing this job.

Randy V · 12-01-2008, 06:10 PM

I'll copy this over to the 928 DIY forum.

(Dwayne posted this back in August

)

12-01-2008, 04:04 AM	#19
Lizard931 Addict Rennlist Member Join Date: Apr 2003 Location: Abbotsford B.C. Posts: 4,896	I used one of these and was not overly impressed with the pedal feel afterwards, and while I did everything the same, when I went back to the old 2 person method the brakes felt much much better after and I did see some air come out. But I was working on a practically dry system. As to brake fluid do not run DOT 5 unless you flush everything out and replace all seals. You can however run DOT 5.1, 4 or 3 DOT 5.1 is compatible with DOT 3, and 4 systems but has a much higher boiling point. I run wilwood 600+ in one car, and wilwood 675 in the other cars. I find that I have much better pedal feel and even with the 575 in the car, I experianced ZERO brake fade on a track that every other 928 that has run has seen fade. Good post btW Dwayne. __________________ Colin J JDS Porsche Western Canada Supplier. Don't steal, the government hates competition! 1981 928S Euro, S4 bumper caps, 86 engine, currently undergoing MASSIVE changes. 1987 928S4 Auto 1987 928S4 5 speed They ALL have the porkensioner!

12-01-2008, 07:26 AM	#22
Xlot Addict Rennlist Member Join Date: Jun 2006 Location: Sydney, Down Under Posts: 1,354	Nice write-up as ever. When I did mine, I also bled the master cylinder - there's a bleed nipple on top of it, just below the reservoir, pointing up. __________________ Hilton '89 S4 5-speed - Guards Red, sunroofless - 157k miles '87 S4 5-speed - Grand Prix White, LSD, flip-up wing - 119k miles

12-01-2008, 08:09 AM	#23
John Veninger Addict Lifetime Rennlist Member Join Date: May 2001 Location: New Jersey Posts: 3,533	Nice write up. The blue hose for the manual cars can cause a real mess and will blow off at around 15psi if it is fairly old. Sometimes first hand experience is NOT how you want to learn. Keeping it at 10-12psi and there shouldn't be a problem. __________________ John Veninger 1990 928GT 1980 928 6.4L(work in progress) Bent valve club! PCA National DE Instructor CVR-PCA 928OC Join Rennlist! "Don't worry about the world coming to an end today. It's already tomorrow in Australia" (Charles Schultz)

12-01-2008, 05:22 PM	#26
bfellows Addict Rennlist Member Join Date: Dec 2004 Location: Staffordshire United Kingdom Posts: 803	Dwayne, you the daddy! Thanks for another great write up! __________________ Bert '88 S4 auto - One of the fast ones......

12-01-2008, 05:44 PM	#27
Tom in Austin Addict Rennlist Member Join Date: Jul 2002 Location: Austin, TX Posts: 580	I like the tips for removing the bleeder when finished. The way I do it is to lower the power bleeder over the fender until it rests on the ground; i.e. lower than the master cylinder. Then, when I gradually loosen the cap on the reservoir it seems to suck excess fluid back down into the power bleeder, and I only have to do a little final topping off to get the level correct. Something others may have noticed too ... if you wiggle the bleeder screw the least bit while the fluid is escaping you can get a long string of tiny bubbles. I think these come from the screw vicinity and not from the lines, but I ran a ton of fluid through waiting for these to stop. Also, if you're bleeding after opening the system, like for example, re-installing a caliper, it can take a long time to get all the air out of the lines. I tend to overkill and buy too much fluid to be sure I get all the bubbles out. One other note, I believe it's true after opening the system, you are supposed to re-bleed after driving the car and engaging the anti-lock system a few times. Some air can apparently get trapped in the antilock plumbing and it has to escape out into the main lines in order to be bled out. No doubt, the Motive is a handy tool and beats the heck out of any other way of doing this job. __________________ 1994 GTS Color 83E - Raspberry Red, Interior Black over Silver Gray Featured in the "High Heels & Hot Wheels 2010" Calendar by Pcar928fan

12-01-2008, 01:25 AM	#16
jpitman2 Super User Join Date: Dec 2002 Location: Australia Posts: 2,210	Fabulous, just what I need, doing it next weekend! jp 83 Euro S AT 51k

12-01-2008, 01:35 AM	#17
Mrmerlin Petie3rd Rennlist Member Join Date: May 2004 Location: Aurora Colorado Posts: 7,593	make sure that you have a an additional hole (small) drilled into the top of the catch can otherwise you will be pressurizing it and then when you remove the hose from the bleeder the fluid will push out from the pressurized bottle

12-01-2008, 01:38 AM	#18
jpitman2 Super User Join Date: Dec 2002 Location: Australia Posts: 2,210	Thanks, duly noted. jp

12-01-2008, 06:57 AM	#21
marton Super User Join Date: Nov 2001 Location: zürich, switzerland Posts: 2,222	Great write-up Did mine earlier this year with same Motive Power bleeder & dot5.1; pedal is really hard now. Only extra point I would add is do not use too much force when undoing the bleeder nipples; they are not hard to break... Maybe squirt them with some easing fluid an hour or two before you start. Marton

12-01-2008, 02:03 PM	#24
Mrmerlin Petie3rd Rennlist Member Join Date: May 2004 Location: Aurora Colorado Posts: 7,593	the reservour will come off the master with about 20 PSI, it launches like a rocket

12-01-2008, 04:58 PM	#25
LeoDioxide Addict Rennlist Member Join Date: Sep 2008 Location: SC, USA Posts: 78	You are my hero.

12-01-2008, 06:10 PM	#28
Randy V Rennlist Emeritus Lifetime Rennlist Member Join Date: Jun 2000 Location: Insane Diego, California Posts: 13,933	I'll copy this over to the 928 DIY forum. (Dwayne posted this back in August ) __________________ Randy V. San Diego, California '94 928 GTS - Midnight Blue Metal