Squeak at low speed

[Spackers]

I’ve a 991.2 S and it’s developed a squeak in the rear wheels at low speed in time with the revolution of the wheels.

The OPC has checked it and can’t find anything. They’ve told me to brake hard.

Have tried this a few times. Have also driven 600 miles since the OPC check and it’s still there. Any ideas?

 

[Lancerlot]

If you have PCCB's and these are prone to squeals and squeaks, particularly in hot, dry, dusty conditions. Sometimes they're fine, then exceptionally noisy at others. Try a few very hard applications of the brakes from very high speed to clean them up. Get them stinking hot if you can.

If this doesn't work, you could try removing the pads, using a high pressure airline to blow the dust from all components and refit using a very light application of non-metallic anti-squeal grease on shims and pad backs.

Whatever you do, the noises may return periodically - it's just one of the prices you pay for having the uprated system.
Regards,

Clive

 

[Spackers]

Hi Clive, Thanks for this, I don't have the PCCBs and have tried very hard braking, but it's made no difference and the OPC has cleaned them out. Very strange! It does it all the time now when I'm driving at low speeds - 5-20mph. Very annoying sound with the sunroof open! At least they've had a good look so if anything major goes wrong it should be covered under the warranty.

Thanks, Kind Regards, Chris

If you have PCCB's and these are prone to squeals and squeaks, particularly in hot, dry, dusty conditions. Sometimes they're fine, then exceptionally noisy at others. Try a few very hard applications of the brakes from very high speed to clean them up. Get them stinking hot if you can.

If this doesn't work, you could try removing the pads, using a high pressure airline to blow the dust from all components and refit using a very light application of non-metallic anti-squeal grease on shims and pad backs.

Whatever you do, the noises may return periodically - it's just one of the prices you pay for having the uprated system.
Regards,

Clive

 

[Lancerlot]

It's good news you are on steel rotors since this makes it much easier (and cheaper) to resolve. It's just a case of how much you're prepared to do or spend to sort it out.

Take a look at these 2 videos as I think it may help you understand the problem:-
https://www.youtube.com/watch?time_continue=4&v=fUNHb9O52WQ
https://www.youtube.com/watch?v=ivMB4WEGgZo

If it were me, I would firstly check the rotors for surface defects and run-out problems and if OK, try fitting new, genuine Porsche pads.

If the problem persists then it's possible the rotors have become contaminated and will need to be replaced (again use genuine Porsche parts). After this, you would need to be looking at more complicated engineering solutions such as defective callipers, mountings, hubs, wheel bearings etc.

However, new pads and rotors should usually resolve the issue.
Regards,

Clive

 

[Spackers]

Hi Clive, thanks ever so much for your helpful advice. I'll give it a try. My biggest concern was that it is the bearings; although shouldn't be this on a three yr old car with 14k miles!

 

[Lancerlot]

You should be fine on wheel bearings since the noise is only evident at low speed. If it disappears with a light application of the foot pedal, it is definitely brake related. I assume you've already checked that the handbrake is not binding and there's no gravel lodged anywhere in the calliper, rotor or dust guard?.
Regards,
Clive