Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

Overview

This guide goes through the steps we used to flush the brake fluid on a Porsche 911 (991.1) Carrera S. For the 911 (991.1) Carrera S with normal brakes (not carbon ceramic), flushing the brake fluid is no different than any normal car. We chose to use a Motive brake fluid power bleeder instead of flushing the brake fluid the manual way with one person pumping the brake pedal. The Motive brake fluid power bleeder saves a significant amount of time and only requires one person. If you flush your brake fluid often (e.g. if you track the car often), we definitely recommend getting one.

Before flushing the old fluid, you could use a turkey baster to remove some of the old fluid in the reservoir first to reduce the amount of fluid being flushed and prevent mixing of new and old fluid. Personally, we did not do this, since the Motive brake fluid power bleeder makes quick work of the flush and have not seen an issue of old vs. new fluid mixing.

NOTE: Always be careful not to spill brake fluid on any painted surface. Brake fluid will remove paint very easily and quickly! Also, be careful with brake cleaner, since it will discolor paint protection film (PPF)/clear bra.

Parts Used

Part	Quantity	Part No.	Links to ones we used
Brake Parts Cleaner	1 - 2	Chlorine-Free Brake Parts Cleaner	Amazon
Porsche Brake Fluid	2 L	Porsche #000.043.210.82 (also 000.043.305.52)	Suncoast

Tools Used

Tool	Link
Quick Jack BL-5000XL portable lift	Amazon
Jack Stands	Amazon
19 mm 6-Point Socket, 1/2" Drive	Amazon
1/2" Drive Ratchet	Amazon
1/2" Drive Torque Wrench	Amazon
DeWALT 1/2" Impact Wrench ¹	Amazon
Porsche Wheel Guide	Amazon
Slip Joint Pliers	Amazon
11 mm Flare Nut Wrench	Amazon
Motive Brake Fluid Power Bleeder Kit	Amazon
Motive Brake Fluid Catch Bottle(s)	Amazon
Large Oil Pan	Amazon
Disposable Shop Towels	Amazon

¹Not necessary to complete this job, but sure makes it a lot easier!

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

Procedure Used

1. We lifted the car off the ground - enough for us to easily work inside the rear wheel wells. We used a QuickJack along with a few jack stands to be on the safe side while under the car.
2. Next, we pulled out the wheel lock tool out of the front trunk.
3. Using the 19 mm socket (the wheel lock tool on the corresponding bolt) and DeWALT 1/2" impact wrench we removed the wheel lug bolts on the rear wheel. TIP: we put a few wraps of blue painters tape around the outside of the 19 mm socket to prevent scratching the wheel.

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

4. With the wheel bolts removed, we removed the rear wheel while using the Porsche wheel guides to prevent ruining the wheels, brake calipers, and/or brake rotors.
5. We repeated Steps 3. and 4. such that all of the wheels are removed.
6. Next we opened the front trunk and remove the cover to reveal the brake fluid reservoir on the driver's side.

7. Next, we filled the Motive brake fluid power bleeder with two bottles (rougly 2 L) of brake fluid.
8. We attached the Motive brake fluid power bleeder to the reservoir, located inside the front trunk.

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

9. After insuring a good seal with the reservoir, the Motive brake fluid power bleeder was pumped to a pressure of 15 - 20 PSI.
10. We began with the right rear wheel as this is the furtherest distance from the brake fluid reservoir. We used a minimal amount of brake cleaner on a shop towel clean on and around the outer bleeder valve. The bleeder valve cap was then carefully removed; sometimes the gentle use of slip joint pliers was necessary to get the cap off.
11. Next we firmly attached the hose of the Motive brake fluid catch bottle over the outer bleeder valve. Attach the bottle to a point on the car that is ABOVE the bleeder valve. This is extremely important as this will allow the air to rise out of the lines.

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

12. The 11 mm flare nut wrench was then used to open the bleeder valve by slowly loosening it. We were sure to not fully unscrew the valve, just enough for a slow steady flow of brake fluid into the Motive brake fluid catch bottle. NOTE: this first (and longest line) will take the longest as all of the old fluid is pushed through the system. The subsequent bleeder valves/calipers will not need to flush as much fluid. As a precaution, we kept a large oil pan under the caliper in case of any spillage.
13. While monitoring the fluid exiting the valve, as the fluid visibly changed to clear new fluid, we tightened the bleeder valve. At this point there should not be any air bubbles in the fluid exiting the valve. If there were bubbles, we opened the valve to continue flushing the fluid until absolutely no air bubbles were visible. Again, use brake cleaner to clean any brake fluid left on/around the valve. NOTE: It is important that the reservoir fluid does not fall below 1/4 of the maximum level and that the Motive brake fluid power bleeder does not run out of fluid. If the reservoir becomes empty, air is introduced into the brake line and the whole process must be restarted. We monitored the Motive brake fluid power bleeder pressure was kept in the range of 15 - 20 PSI.
14. Next, we attached the Motive brake fluid power bleeder hose to the inner bleeder valve and repeated Steps 10. through 13..
15. With the right rear caliper complete, we repeated Steps 9. - 13. on the left rear, right front and left front calipers. This order is specifically done to flush from the longest brake fluid lines to the shortest.
16. With the bleeding process finished, we slowly unscrewed the TOP of the Motive brake fluid power bleeder cannister to allow release the pressure and allow the fluid to drain back. DO NOT loosen the adapter to the reservoir until the pressure has been released... a large mess will follow!
17. After bleeding all of the calipers, the brake pedal should not be spongy when depressed. The pressing action should be progressive after the short free travel of the pedal.

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

18. Finally, we reinstalled the wheels by repeating Steps 2. through 4. in reverse order. With the wheels installed, we used the 1/2" drive torque wrench and 19 mm socket to tighten each wheel lug bolt to 118 lbs ∙ ft. NOTE: After the next drive, we checked the torque of each of the wheel lug bolts again.
19. Before and after our next few drives, we checked all of the bleeder valves, inside of each rim, and fluid reservoir to insure that no brake fluid was leaking. If any leak, we addressed the issue immediately!

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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Overview

Parts Used

Tools Used

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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Procedure Used

Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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Porsche 911 (991.1)

Porshce 911 (991.1) Brake Fluid Flush Guide

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