Skip the auto shop - Our mechanics make house calls

Q: Lack of brake pressure on hard braking but no visual leaks.

asked by on

Replaced brake pads on car today due to a shake, would typically diagnose to warped rotors but they were recently replaced and tested to be balanced. replaced pads and drove around lot to settle pads. pressure remained consistent but on the way home I tested a higher speed stop. 35-40mph and brake pedal depressed fully to the floor and pressure did not immediately return. no drop in fluid level and in no leaks on cardboard beneath car.

My car has 242000 miles.
My car has an automatic transmission.

A: When the brake pads are worn out and repl...

Hello:

When the brake pads are worn out and replaced by thicker pads, excess brake fluid in the lines will push back into the master cylinder when the caliper is depressed. In some rare instances, this may cause air bubbles to be trapped in the lines; which can cause the pedal issue you’re experiencing. The first thing I’d do is bleed your brake to see if the pedal issue is fixed. If this doesn’t help, contact a professional mechanic to have them complete a brake system inspection so they can trace the source of this issue as soon as possible.

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

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: Cracked radiator

Hello, thank you for writing in. If the radiator is cracked, then it will need to be replaced. You should start by fixing the radiator first, and then turning your attention to the steering issue. Without coolant running through the...

Q: Rear passenger tire has slight inward tilt

Any time there is abnormal wear on the tire, you know something is wrong. The fact that you can see the inward tilt of the wheel is not good. It could be a wheel bearing, but this would accompany a...

Q: 2012 Chevy Malibu oil change

The oil filter should not be damaged by over tightening it, however you may want to be sure that the threads on the filter were not damaged by tightening it too much as this may cause it to leak. Generally,...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.