Question about 1998 Volvo S70

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How much should I expect to pay to replace the vacuum brake booster ?

Hissing when depressing brake pedal, little bit of rough idle, and mushy brake pedal.

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Call parts store for price of part. Replacement is not difficult so expect $100 to $150 labor.

Posted on May 01, 2015

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Check you Vacuum lines going to the Brake Booster first, it is fairly rare for a booster to go out and is usually an bad hose or the grommet sealing the hose to the booster.

Posted on May 04, 2015

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Thanks for the question. I suspect the booster MIGHT not be the issue, although I am looking for less expensive alternatives. Perhaps the brake booster check valve itself (white plastic quarter-sized plastic thing) on the outside of the booster with the hose running to it, or the hose itself may be sucking air somewhere. That's $45.00. That symptom usually produces a HARD brake rather than a mushy one, but it's worth a try.

The Volvo booster is $450, and the Ate brand (just as good) is about 1/2 that price. I would do some leak checking with a vacuum gauge, and perhaps a stethoscope to make sure it's actually the booster that is leaking internally, rather than the less-expensive alternatives that are the hoses from the manifold, or the booster check valve.

Posted on May 01, 2015

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About 200 dollars

Posted on May 01, 2015

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1 Answer

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Not sure if you have done all this.



BRAKE BOOSTER INSPECTION

Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
1. Depress the brake pedal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty
2. With the engine stopped, depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. On consecutive applications, the pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

Check valve test:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be a vacuum available. If no vacuum is available, the check valve is not working correctly. Replace the check valve and retest.

END TEST

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Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

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