I paid Porsche dealer to flush my CTT brake fluid in 2017. This time I decided to do it myself and found out that the dealer did not bleed the inner valves at all 4 corners. The valves were never cracked opened and when I bled them I saw craps coming out, definitely really old fluid. It really depends on which auto mechanic apprentice works on your vehicle. I took auto mechanics more than 20 years ago and some of my classmates were there not because they had a passion to work on cars. I remember one of them worked on a transmission and forgot to fill it with fluid. We had to rebuild the transmission for the customer as a result.

 

I bought it 6 months ago. It is a 2018 with 20k miles. Brakes were never flushed out. "Porsche inspected pre-owned" means they visually/casually checked if there was some fluids in the reservoirs. I am sure they did not flush out anything...even check the condition of the oil. Oil level check is electronic.

 

What's wrong with just using a Motilve power bleeder? It's $50 and there's no chance of spillage or air seeping back into the system because it keeps the brake system at pressure all the time.

I just looked through alldatadiy brake bleed procedure for my Cayenne. It says to bleed the brakes normally (all 4 corners, outer bleed valves first) with the power bleeder and to pump the brakes at the same time (why?).

Only when replacing the hydraulic unit: go into Porsche System Tester (PIWIS?) and activate this option: PSM->Maintenance/repairs->Bleeding hydraulic. Then bleed the passenger side of the car (again) to bleed the secondary circuit. EZdiag might be able to do this but I'm not changing the hydraulic unit.

 

I've used the Motive pressure bleeder successfully on the Cayman, Cayenne & Boxster. When the dealer did the Cayenne brake flush they only did the outer bleeders. I use brake Porsche fluid.

 

I bought the cheap power bleeder from harbor freight - worked just fine but could use a better tip that goes on the bleeder - it wasn’t air tight. Did all 8 but didn’t know about the abs til now

 

Motive is air tight, used it more than a dozen times and it's still fine. Just clean it with methanol when you're done, brake fluid is nasty.

I'm still not sure what you guys mean by ABS, Alldatadiy only mentions a special procedure when changing the hydraulic unit (ABS). Does anyone else's procedure differ?

 

my god this thread is scary.

This is not hard. ATE 200 fluid (no, porsche doesn't make brake fluid), a motive power bleeder used dry, and yes, you bleed from all 8 bleeders.

Lets not complicate it.

 

Here I am, 2023 and I had just finished bleeding/flushing all my brake lines, including both the inner and the outer sides of the calipers.

I have a one way bleeding valve and had used 3-12 oz bottles of DOT4 fluid and since I had last flushed the system, I was glad to get the job done today as all the fluid that had come out was quite a bit darker than the new fluid.

 

Ben coming full circle. Good Work!

 

Todays idiot question for the forum, is there two types of cap for the reservoir? All the pictures I see online have a level sensor on, but mine looks like this. Also the fluid is blue.

 

Interesting.. only blue brake fluid I know is ATE super blue and if I remember correctly, it's been banned in North America many years ago.

And yes, mine has yellow cap with level sensor.

 

Given the cars history there's a chance the fluid is still original 😅 It doesn't look like old fluid though, well at least it doesn't look discoloured as "normal" fluid does when it ages.

Either way I'm going to replace it all tonight. The cap has me thrown though. I'm pretty sure I'm looking at the brake fluid reservoir now.

 

Yes, two types of caps exist: the factory original, and some other kind. Yours is not original.

And there is no level sensor in the brake fluid reservoir cap on a 958 Cayenne... it's just a cap with a gasket.

 

The mystery deepens, so my fluid might be original but the cap is not 😅😅

Sadly my new power bleeder isn't air tight so I'll have to wait another few days to bleed the system.

 

I switched from pedal bleeding to a mightyvac and gravity bleeding many years ago. Suck out old fluid from the master. Top off and start with the right rear, left rear, right front and finally driver front. It works and is very simple. I've done this after rebuilding calipers on many BMWs and always had a solid brake pedal. Just keep the fluid off your wheels and paint.

Mark