Auto parking brake

Faults and Technical chat for the Volvo XC40
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Sharky
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Joined: Sat Jan 01, 2022 1:33 pm

Post by Sharky »

Purchased my XC40 in October, car is less then 1 year old. I park the car forward on my driver with a slight down hill, and always use the parking brake.
If the car has been parked for several days without any movement when I attempt to reverse of the drive using auto release the release seems stubborn and when the brake is released is makes a load clunk from the rear.
This appears to only happen in these circumstances, does this sound right.

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Greggspies
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Post by Greggspies »

Could it be the discs rusting in damp weather and the calipers sticking slightly as a result?
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Chris John
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Post by Chris John »

Mine does this. It’s the rear breaks sticking on after being left for a few days.
My car was left outside for 3 months without moving. A bit of throttle and they soon released with a bang :D
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Deleted User 3359

Post by Deleted User 3359 »

Discs are made of Cast Iron, and rust prolifically, as said above, it's rust. The brake pads may well be warm when you stop, and clamping the pads on will enhance the rusting. In the good old days (240/740/760 era) the big cars all had small brake drums built into the rear discs for the parking brake.

My wife's' car often stands for a while, it will click as it moves off, and until you give it a good brake application. Same root cause
jamie307
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Post by jamie307 »

This is normal, my old Focus with rear drums used to do it as well. The workaround is not to use the parking brake but rely on the gear box or engine to hold it. At home which is the only place it's likely to be a problem, you can even chock the wheels, perhaps by fixing a plastic speed bump across the driveway.
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