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Originally Posted by skandalis447
(Post 3053308)
in order to have a correct bleeding,PIWIS is needed...It is written in service manual...It opens a bleed valve from psm unit and let it bleed from trapped air...(through front left or right caliper,cant recall...)
I'll use a motive pressure source to do it. Did the M5 this weekend and it was duck soup. :) A |
Originally Posted by FAST FWD
(Post 2904248)
Over the years, I've tried just about everything for brake bleeding, including: someone in the car pumping the pedal, speed bleeder check valves, Motive pressurized bleeder, vacuum pump, ... You name it, I've tried it.
My indie recommended that I try a pressure system, and he loaned me his to give it a try. I have to say that it feels almost like cheating - it's so easy. It's a pressure tight cap that screws onto the brake fluid reservoir, that you then hook up to an air compressor. Set the regulator for 20 psi. (See photo 1.) Then just go wheel-to-wheel and crack open the bleed screws 1/2 turn and collect as much fluid as you like. (See photo 2.) Retighten the bleeder and you're done. I did the two rears first, then released the pressure and refilled the reservoir before doing the fronts. I think that I'll make a connector line so that I can take the air pressure off a tire so I can do it at the track. It's made by Power Probe, and the one that fits our cars is BA05 (that's a zero). It's also not very expensive. I'm not posting the vendor or the price here to avoid any conflicts with the board policy. Jon Question, you said "...I think that I'll make a connector line so that I can take the air pressure off a tire so I can do it at the track." How would you "control/regulate" the air pressure coming off a tire, as most tires are inflated well over 20psi (37-44psi avg)? Are you first releasing extra air pressure in tire down to 20psi and checking with gauge?:confused: I don't own a compressor and looking for alt means (short of buying a Motive) to provide 20psi of air pressure to reservoir (per you procedure). Thoughts? |
Originally Posted by Musclehedz101
(Post 3095247)
First, great post, thank you for sharing!
Question, you said "...I think that I'll make a connector line so that I can take the air pressure off a tire so I can do it at the track." How would you "control/regulate" the air pressure coming off a tire, as most tires are inflated well over 20psi (37-44psi avg)? Are you first releasing extra air pressure in tire down to 20psi and checking with gauge?:confused: I don't own a compressor and looking for alt means (short of buying a Motive) to provide 20psi of air pressure to reservoir (per you procedure). Thoughts? Jon |
I had to replace my Motive bleeder kit recently, and ordered the Black Label kit.
I wanted to bring this thread back just to let people know, the Motive Black Label kit comes with a metal cap and gasket similar to PowerProbe, with tubing that can be adapted for a air compressor. Amazon carries it for a price lower than the Motive online store itself. Buying the Black Label kit allows you to either use the reservoir and pump, or plug it into an air compressor. Just an FYI. bob |
That is old school. Porsche techs have been using that same contraption for years. :cool:
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Another thought on the pressure stated as safe. Are they referring to 'gauge' or 'absolute'?
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Originally Posted by Musclehedz101
(Post 3095247)
First, great post, thank you for sharing!
Question, you said "...I think that I'll make a connector line so that I can take the air pressure off a tire so I can do it at the track." How would you "control/regulate" the air pressure coming off a tire, as most tires are inflated well over 20psi (37-44psi avg)? Are you first releasing extra air pressure in tire down to 20psi and checking with gauge?:confused: I don't own a compressor and looking for alt means (short of buying a Motive) to provide 20psi of air pressure to reservoir (per you procedure). Thoughts? On a side note: it has been my experience that on other German cars and some of my 1980s vintage Porches, you have to pinch the overflow tube on the brake reservoir when using a pressure bleeder. Otherwise you end up with your new brake fluid on the garage floor. |
I know that MKelly recommended to use the Motive dry so as not to contaminate the fuild. What makes this any different than using the Motive? It is the 30 pumps it takes to get it up to pressure? If anything, i could use the slight workout!!
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+1 for this, gives a really good feel in pedal after bleeding.
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Next week I will go to make the oil service at the dealer and I want to change the brake fluid too because it has 2 years, I ask them if they are useing the piwis when changing the fluid and they said that no and only one liter of brake fluid is needed.
Are they stupid or not, this is my question?! Thanks? |
Originally Posted by alex55
(Post 3170480)
Next week I will go to make the oil service at the dealer and I want to change the brake fluid too because it has 2 years, I ask them if they are useing the piwis when changing the fluid and they said that no and only one liter of brake fluid is needed.
Are they stupid or not, this is my question?! Thanks? |
I have been using the Black Label for years and have never had any problems with any car that had ABS. The Motive is going to do just as good a job as the contraption listed in this thread. I have an air compressor and do not see any advantage to using this contraption over the Motive. In fact, as mentioned in an earlier post, the Motive has the advantage of keeping the reservoir filled up during the process.
If your brakes have not been bled in a long time, 2 years plus, then I would suggest using a liter the first time. After two or three days of driving, bleed it a gain with another liter. You will be surprised at what comes out the second time that you did not see the first time. Plus, this will eliminate the fluid that may get trapped in the system since the ABS pump is not actuated via the OEM computer at the dealership. |
Just ordered my Motive Black Label, been thinking about it for a while, and now that I have a few sets of brakes to do, its time! I also think the Motive product is the better option as you do not need an external air pressure source, which is an advantage not only for ease or use, but as others have pointed out, there IS condensation in most air compressor systems, unless you have a water filter, which most do not.
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Originally Posted by Tj Hunter
(Post 3170589)
Just ordered my Motive Black Label, been thinking about it for a while, and now that I have a few sets of brakes to do, its time! I also think the Motive product is the better option as you do not need an external air pressure source, which is an advantage not only for ease or use, but as others have pointed out, there IS condensation in most air compressor systems, unless you have a water filter, which most do not.
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Not trying to sound stupid but after searching amazon for the motive black label and finding it's hand pump operated would this still be a better idea than using jons original idea of a compressor? How accurate would the hand pump be in terms of not exceeding the porsche max psi recommendation to avoid damage to the system?
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