PSCB During Rain (no friction)

[Dslev]

It doesn't rain much in So Cal, but this past few weeks we've seen some decent rainfall. My Surface Coated brakes act like old drum brakes in the rain, they seem to have no friction unless I apply much more pressure to the pedal then is necessary during dry weather, anyone else experience this?

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[andix]

The brake's perfect. Which tyres?

 

[wurzitup]

I wonder if you're only pressing enough for the regen braking and not enough to blend the mechanical braking component in yet?

 

[Dslev]

I wonder if you're only pressing enough for the regen braking and not enough to blend the mechanical braking component in yet?

Unfortunately I'm very familiar with the PSCB as I've had some issues with it that Porsche acknowledged but could not completely rectify. This is not a regen issue, this is the brakes activate (mechanical) but seem to just keep sliding, like the old drum brakes when they got wet. They work once I apply more pressure (more than normal during dry conditions) pressure. I've been through the drop in pedal and the attached bulletin, this is different.

 

[Dslev]

The brake's perfect. Which tyres?

Thank you, Definitely not a tire issue.

 

[911mantas]

It happens very often with PCCB on my Taycan and Cayenne. It is normal, you must push the brakes harder to push out the water.

 

[optik382]

It happens very often with PCCB on my Taycan and Cayenne. It is normal, you must push the brakes harder to push out the water.

This sounds like a crash waiting to happen..

 

[Tay Tay]

I would occasionally lightly press on the brakes when I had carbon ceramics to get the water off them. This is a general problem with these kinds of brakes, not specific to Porsche. However, with an EV, I suspect that trick doesn't work because light braking only applies regen so when you need the real brakes there's water on them?

 

[jlee504]

so just reopening this topic. I have the Porsche surface coated brakes and they have always been weird when it rains and they are wet. they don't seem to grab at all and I have a really hard time stopping.

well today I went through a small localized downpour and at 70 mph came up on stopped traffic in front of me. I pressed the brakes harder and harder to get it to stop but it never did. luckily there was a right turn lane I was able to steer into while on my brakes and I slid by 15-20 cars and luckily it was uphill and I finally came to a stop in the intersection.

Anyone else having these problems with the surface coated brakes? my service guy said they aren't great and I probably should have spec'd ceramics or steels.

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