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06-07-2021 11:11 AM #1
2001 Volvo v70 brake booster problems
A friend of the family owns a 2001 volvo v70 they took it in to have brake work done and replace the brake booster. The booster and vacuum check valve has been replaced five times from supposedly 3 different suppliers because of booster defects and they still have problems. Each time they hear a hissing sound from the booster when it goes out.
Anyone have any idea how/what may be making this happen...TIA joeDonate Blood,Plasma,Platelets & sign your DONORS CARD & SAVE a LIFE
Two possibilities exist:
Either we are alone in the Universe or we are not.
Both are equally terrifying.
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06-07-2021 01:40 PM #2
The booster is just a big canister that captures a diaphragm between the two halves, with valving that puts vacuum on both sides at rest, and then when the pedal is pressed allows atmospheric pressure to press on the area of the diaphragm to assist pedal pressure. What this simplified diagram leaves out is that the "piston" against the diaphragm allows vacuum to pass by at rest, and seals when the pedal is depressed, trapping the vacuum downstream.
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brake-booster-1.jpg
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Sounds to me like the diaphragm is failing for some reason.Last edited by rspears; 06-07-2021 at 01:43 PM.
Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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06-07-2021 05:07 PM #3
Donate Blood,Plasma,Platelets & sign your DONORS CARD & SAVE a LIFE
Two possibilities exist:
Either we are alone in the Universe or we are not.
Both are equally terrifying.
Arthur C. Clarke
-
06-07-2021 05:51 PM #4
Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
Thanks for the inputs guys !
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