I started hearing hisses and whistles the last few days and wasn't quite sure what to make of it. Last night I noticed that when I press the brake pedal, the hissing stops, but continues right after. A little googling said brake booster is dead. Could it be vacuum lines?
Am I out $500?
Brake booster dead?
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jimmy57
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Typically the brake booster.
There is a regulator valve built onto the back end of booster. When brakes are released vacuum is admitted into chamber behind booster diaphragm and if the regulator is defective it leaks and you hear it. Some times it leaks enough to turn on check engine light as the leak upsets fuel mixture if it is bad enough.
There is a regulator valve built onto the back end of booster. When brakes are released vacuum is admitted into chamber behind booster diaphragm and if the regulator is defective it leaks and you hear it. Some times it leaks enough to turn on check engine light as the leak upsets fuel mixture if it is bad enough.
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dcarlson12
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Can the regulator be replaced/repaired of must one replace the complete assembly?
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jimmy57
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You have to replace the whole booster. There is a really stiff spring inside the booster and it is not safe to disassemble without the proper fixtures. The booster has to be completely disassembled to service that part. No one sells the parts, only the whole booster.
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dcarlson12
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Are items such as the brake booster more subject to failure on European vehicles such as Volvo or is it just that on this site we mainly hear of vehicles which encounter such failures and thus there is that perception?
Do Asian made (eg Japanese and Korean) vehicles and 'American' made vehicles also suffer such failures but we don't hear about them unless we go to Asian car and American car forums?
I don't recall such failures on Japanese and American cars which I have owned in the past. But perhaps it is just the 'luck of the draw' and brake boosters also fail on those vehicles??? Also, I haven't owned that many vehicles in my life because I tend to own them for a long time so maybe I haven't been exposed to enough vehicles?
Oh, and sorry if this is kind of 'hi jacking' the thread, but I didn't know if the question justifies a new post....
Do Asian made (eg Japanese and Korean) vehicles and 'American' made vehicles also suffer such failures but we don't hear about them unless we go to Asian car and American car forums?
I don't recall such failures on Japanese and American cars which I have owned in the past. But perhaps it is just the 'luck of the draw' and brake boosters also fail on those vehicles??? Also, I haven't owned that many vehicles in my life because I tend to own them for a long time so maybe I haven't been exposed to enough vehicles?
Oh, and sorry if this is kind of 'hi jacking' the thread, but I didn't know if the question justifies a new post....
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jimmy57
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Boosters don't have too high of a failure rate on Volvos compared to others except for the DSTC feature cares which add a solenoid activated regulator valve and a brake apply sensor.
The anti-theft "clubs" that hold brake pedal up by anchoring brake pedal to steering wheel killed a lot of boosters.
The anti-theft "clubs" that hold brake pedal up by anchoring brake pedal to steering wheel killed a lot of boosters.
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