Q: Q: Why no brakes

asked by on

2001 gmc yukon replaced: wheel bearing,then lost power steering and power brakes.

battery died. can't hold charge. alternator replaced 2 years ago.

replaced hydro booster, and still didn't have power steering or power brakes.

replaced power steering pump, and gained power steering, but still no power brakes. unsure of what is next - needs repair immediately.
My car has an automatic transmission.

I would first recommend checking the brake fluid level. There needs to be ample brake fluid in the system to so that there is not a lack of hydraulic pressure. Secondly, check to be sure you do not have vacuum leak in the brake booster. As you may know, the brake booster operates off of vacuum pressure and when there is a vacuum leak, this can cause a loss of braking power from little to nothing at all. I would recommend having an expert from YourMechanic come to your home to diagnose your braking system and possibly repair the vacuum break booster.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. Q: Why no brakes

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: My car has an electrical system issue, loses power, and stalls

Hi there. These situations can be caused by a number of things and can be frustrating. From my experience with this vehicle, it is usually caused by a bad ignition switch. It can also be a bad main relay or...

Q: There is a ticking noise coming from the dash when I unlock the car, what is it?

This is a notorious issue with this model of Impala. The noise you are hearing is most likely the blend door actuator attempting to move to its default position but is not able to do so. This repair usually requires...

Q: what causes transmission to not shift?

I would check to see if there are electronic shift solenoids in your transmission. Basically, the shift speed is controlled electronically through solenoid operated valves. Heat affects these if they are malfunctioning. For example, resistance increases as temperature rises. Also,...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...