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Brake pedal goes to the floor. Took master cylinder off,

Brake pedal goes to...

Brake pedal goes to the floor. Took master cylinder off, checked out fine. Put it back on and pedal is stiff.

Mechanic's Assistant: Have you tried cleaning and oiling the brake pedal's pivot under the dash?

Yes

Mechanic's Assistant: What is the make/model/year of your car?

2004 Volvo S60 2.5

Mechanic's Assistant: Are you fixing your S60 yourself? What have you tried so far?

I checked all the brake lines for leaks. Took brake master cylinder off. Put it back on and brake is hard as a rock.

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Answered in 12 minutes by:
1/18/2018
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Volvo
Satisfied Customers: 16,700
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Verified

Hi, my name is ***** ***** is caused by a sticking bypass valve inside the master cylinder, if it sticks open, the pedal will go to the floor, and if it sicks closed, the pedal will be rock hard, it was obviously stuck open at first, and now its stuck closed, you will need to replace the master cylinder,Tim

Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Volvo
Satisfied Customers: 16,700
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Verified
Tim Mohr and 87 other Volvo Specialists are ready to help you
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Customer reply replied 7 months ago
Thank u

Anytime my friend,Tim

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