Skip the auto shop - Our mechanics make house calls

Q: Hard to press brake

asked by on

My brother's car has a very rough idle and misses on cylinder 1 and 2 sometimes. We cleared the trouble codes and this solved the problem. But now the brake pedal is causing trouble. It’s very hard to press down on. It won’t go down and there is a hissing noise coming from the brake pedal, too. What’s causing this?

Hello. This is caused by a bad brake vacuum booster. When the booster fails, the brakes will get hard and it can cause a vacuum to leak in the engine causing a misfire. It sounds like this is what is happening as the booster is powered with engine vacuum. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the brake pedal problem and perform appropriate 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!

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: Hazard lights don't work

Hi, thanks for writing in. The hazard warning lights and turn signal lights utilize the same flasher unit, but with different wiring connections. It appears the hazard warning portion of the flasher unit (internals) has failed. I would recommend a...

Q: Engine revved in drive - 2006 Chevrolet Avalanche 2500

This sounds like the transfer case isn't completely engaging selected gears (High/Low, 2/4wheel drive). There is a GM Service Bulletin on this issue - TSB Reference #3424. Check with your dealer on this one.

Q: Calipers seem to stick

The brake caliper slides may be in need of being cleaned and lubed. This should be done at every brake pad change. It is not always done when the brakes are replaced. This would be the first thing I would...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.