3-Pedals

Are there any special steps for 991.2 GT3RS (I guess GT3 and others are same) over and above how you would do a regular brake flush in any other car? The motiv tool filled, pressure 15 psi, start from far corner outer nipple, etc? Do you need PIWIS or any special tools? Is the bleeder screws hand tight?

GrantG

Nothing special, just don't allow the Motiv nor car's brake fluid reservoir to go dry (then you need need PWIIS to run the ABS pump to purge the air). Bleeder valves have a torque spec of 130 inch-pounds (just under 11 ft-lbs or 14.7 Nm).

I usually use a turkey baster to suck out as much of the old fluid from the brake fluid reservoir first, then refill with fresh (make sure to do this before attaching Motiv), then use the Motiv to flush. Just keep an eye that you're keeping plenty of fluid around the pickup straw in the Motiv.

Once finished and torqued closed, I use a bottle of aerosol brake cleaner (put its straw right into the bleeder valves and squirt with a shop towel preventing splatter) to get any fluid out of the top of the bleeder that will otherwise weep out once hot.

Lastly, I pour warm water over the calipers (where the bleeders are) to neutralize any residual brake fluid and prevent paint damage.

3-Pedals

Thanks Grant. What motiv products do you suggest? I actually dont have one and always used a helper with the brake pedal and made my own catch bottle. This time I want to invest in the right tools. I also want to buy a catch bottle.

what do you use to torque the bleed screws? I have crow foot attachments not sure if they ll work.

GrantG

I use Motiv Black Label Euro bleeder 019 (and I usually wrap the exposed brass hose connection with electrical tape to prevent damage to the car's paint just to be cautious):
https://www.motiveproducts.com/produ...t-bleeder-kits

For bleeder valves, always use 11mm 6-point box wrench and deep well sockets for torquing. 12-pt tends to round off the corners. I always just do by feel until the end, then torque with 1/4" torque wrench and deep well socket (may also need an extension).

They sell cheap bleeder bottles on Amazon with magnets to hold the bottle to the brake rotor (unless PCCB).
Probably a cheaper option, but like this:
Run the catch can’s hose through the box wrench's opening while bleeding…

LAPorsche3

+1 on the 6pt boxed wrench or the flare nut wrench

Also tape up the area around the bleeder screw so you don't accidentally chip off the caliper paint.

3-Pedals

How much fluid would I need to do a full flush of the system? 2 liters is enough?

LAPorsche3

1.5L works for mine. Get the 500ml bottles for better management.

3-Pedals

Where do you guys get the oem porsche fluid from? I dont see it in suncoast.

GrantG

I wouldn’t bother with that stuff - nothing special - just relabeled ordinary stuff. For track, my favorite fluid is Endless RF650.

If not going to see any track use, something like Motul would be fine.

GrantG

Best to have at least 2L on hand if using the Motiv.

3-Pedals

What about street?

GrantG

Porsche stuff:
https://www.suncoastparts.com/produc...l?gad_source=1

Not sure if it’s true, but someone told me Porsche is relabeled Pentosin:
https://a.co/d/0ircL09

3-Pedals

The suncoast stuff is coming up under 987.2 cayman, 991.2 GT cars use the same fluid?

GrantG

Pretty sure. Wouldn’t be surprised if it’s same as the SUV’s also…

If you go to your dealer, I think they only stock 1 version of DOT 4 fluid…

Sounds like everything in the last 20 years (aside from CGT) uses it:

krell

I don't put any fluid in the pressure bleeder. This saves on wasted fluid a little and makes clean up easier, but does require additional disconnects and re-pressurizations to top off the reservoir.

There's one bleeder, I think it's on the inboard side of the front right corner, that will not accept the 11mm flare wrench. It's like the casting on the caliper doesn't allow enough clearance so I have to use an 11mm socket. Makes things a little messy.

And after two non-working Motiv bleeders out of the box, I gave up and bought a different brand that was less money and has a better construction.