Skip the auto shop - Our mechanics make house calls

Q: Hissing noise from the pendal 20054 Volvo

asked by on

I am hearing hissing noise from the pedal area.
My car has an automatic transmission.

Hi there - your brake power booster has failed - specifically the internal diaphragm. That unit uses engine vacuum for braking assist, but when the diaphragm ruptures as yours has, it sucks in air from inside the passenger compartment. You have probably also noticed that it take much higher brake pedal effort to stop your vehicle. I would recommend replacement of the brake booster by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Hissing noise from the pendal 20054 Volvo

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Crack on engine head gasket

Generally, a failed head gasket will leave evidence in one of four areas. The oil needs to be checked for a milky residue -- as this would indicate coolant leaking into the oil. The coolant needs to be checked to...

Q: Can leaks in the valve cover gasket affect the performance and power of a VW Touareg V8?

Hi, thanks for writing in. The answer is yes. The oil getting on the spark plug wires and plugs will cause the engine to misfire. The valve cover gaskets will need to be replaced along with plugs. The wires will...

Q: Is it okay to turn the rotors with a car that has 23k miles and low pad warning light

Hello. You may have performance type brakes with ceramic pads and holes in the rotors surface for heat dissipation. These need to be replaced and cannot be resurfaced in most cases. If you have normal brakes with no holes in...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.