Q: I have a 2007 GMC sierra classic. What can be the problem if I have no pressure on the brakes

asked by on

I bought this truck from a guy and he said the only problem was with the caliper. I changed both caliper pads the master cylinder and brake booster but I still don't have no pedal pressure

My car has 149000 miles.
My car has an automatic transmission.

Hi Jessica. Thanks for contacting us today. One of the most overlooked components that can cause a brake pedal issues like you’ve described is the proportioning valve. This component is located under the hood and is responsible for adjusting the fluid pressure sent to the rear brakes. If the valve begins to fail, uneven brake pressure can result. It’s also possible that there are air bubbles trapped in the fluid lines, causing the brake pedal problem. You might want to have a professional mechanic come to your location to complete a brake pressure inspection, so they can help diagnose this problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a 2007 GMC sierra classic. What can be the problem if I have no pressure on the 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: Humming noise at the front end of the car

This sounds to me like the exhaust catalyst may be vibrating or it may be the exhaust hitting the frame due to broken motor mounts. The suspension should not be making any humming noise if the engine is at fault....

Q: 99 sliverado no crank starter and battery checked out good. truck died while i was driving hasn't started sense.

Hi there. Thanks for sending your question to us today. When you have the single clicking sound when turning the ignition, it is typically due to a damaged electrical relay. If your battery tested good (meaning it had enough cranking...

Q: Q: Transmission

An appropriate diagnostic to resolve your issue is a failure to shift inspection. Of course, first check your transmission's fluid level and condition. A really low fluid level can cause shift difficulties. Typically, if a transmission fails to automatically shift...

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...
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...
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.