V70 Brakes: - Red brake servo booster seal from Poland

AussiePete · Nov 14th, 2020, 21:04

Hi Everyone

Has anybody who has fitted the replacement Polish red brake servo booster seal had it fail or leak again after a year of so?

Just checking since I am getting hissing noises again. Possibly wasn't fitted correctly. Will need to check.

Cheers P.

barrybritcher · Nov 15th, 2020, 14:12

I heard they are too thick but no personal experience

BlueRubber · Nov 16th, 2020, 19:38

I had mine fitted by a garage and it just started hissing a little today.
Hard to say if the garage made a mistake or not.
The seal seemed good quality

BlueRubber · Nov 16th, 2020, 19:39

I am going to try putting some more PTFE grease on the shaft and around the seal to see if that helps.

AussiePete · Nov 17th, 2020, 02:53

Careful with the grease. The replacement seal is made from silicone rubber.

The correct grease for that is a fluorosilicone grease evidently, not the supplied dielectric silicone grease. Is the supplied lubricant causing premature seal failure???

BlueRubber · Nov 17th, 2020, 11:08

Quote:

Originally Posted by AussiePete

Careful with the grease. The replacement seal is made from silicone rubber.

The correct grease for that is a fluorosilicone grease evidently, not the supplied dielectric silicone grease. Is the supplied lubricant causing premature seal failure???

My kit came supplied with Silicon grease with PTFE in it, is this not the same as fluorosilicone grease?

AussiePete · Nov 17th, 2020, 22:13

Possibly, my university days are long behind me. Then why are the seals failing??

BlueRubber · Nov 18th, 2020, 16:30

Aha, I think I know why these seals are failing, they are made of silicone and they are providing a silicone-based lubricant with it.
My understanding is that you aren't supposed to use silicone grease/lube with silicone seals.

AussiePete · Nov 19th, 2020, 21:00

Quote:

Originally Posted by BlueRubber

Aha, I think I know why these seals are failing, they are made of silicone and they are providing a silicone-based lubricant with it.
My understanding is that you aren't supposed to use silicone grease/lube with silicone seals.

Precisely; that's my understanding too. So what is the best lubricant to use?

BlueRubber · Nov 19th, 2020, 21:41

Quote:

Originally Posted by AussiePete

Precisely; that's my understanding too. So what is the best lubricant to use?

I'm tempted to use some red rubber grease, as that is safe on rubber so hopefully safe on silicone?
Also it is quite thick which should help with the already failing seals in our cars.

I think there is an official grease supplied by Volvo.

Nov 14th, 2020, 21:04	#1
AussiePete Junior Member Last Online: Nov 18th, 2023 04:36 Join Date: Nov 2011 Location: Adelaide	Red brake servo booster seal from Poland Hi Everyone Has anybody who has fitted the replacement Polish red brake servo booster seal had it fail or leak again after a year of so? Just checking since I am getting hissing noises again. Possibly wasn't fitted correctly. Will need to check. Cheers P.

Nov 15th, 2020, 14:12	#2
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	I heard they are too thick but no personal experience __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Nov 16th, 2020, 19:38	#3
BlueRubber VOC Member Last Online: Jan 29th, 2023 11:13 Join Date: Jan 2018 Location: Reading, Berks	I had mine fitted by a garage and it just started hissing a little today. Hard to say if the garage made a mistake or not. The seal seemed good quality __________________ 2002 Volvo V70 2.4 n/a auto

Nov 16th, 2020, 19:39	#4
BlueRubber VOC Member Last Online: Jan 29th, 2023 11:13 Join Date: Jan 2018 Location: Reading, Berks	I am going to try putting some more PTFE grease on the shaft and around the seal to see if that helps. __________________ 2002 Volvo V70 2.4 n/a auto

Nov 18th, 2020, 16:30	#8
BlueRubber VOC Member Last Online: Jan 29th, 2023 11:13 Join Date: Jan 2018 Location: Reading, Berks	Aha, I think I know why these seals are failing, they are made of silicone and they are providing a silicone-based lubricant with it. My understanding is that you aren't supposed to use silicone grease/lube with silicone seals. __________________ 2002 Volvo V70 2.4 n/a auto

Nov 17th, 2020, 02:53	#5
AussiePete Junior Member Last Online: Nov 18th, 2023 04:36 Join Date: Nov 2011 Location: Adelaide	Careful with the grease. The replacement seal is made from silicone rubber. The correct grease for that is a fluorosilicone grease evidently, not the supplied dielectric silicone grease. Is the supplied lubricant causing premature seal failure???

Nov 17th, 2020, 22:13	#7
AussiePete Junior Member Last Online: Nov 18th, 2023 04:36 Join Date: Nov 2011 Location: Adelaide	Possibly, my university days are long behind me. Then why are the seals failing??

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