Skip the auto shop - Our mechanics make house calls

Q: My car brakes are spongy

asked by on

Replaced master cylinder today bled lines and pedal is still spungy new pads rotors calibers but the pedal is still spungy help

My car has 204000 miles.

When replacing a master cylinder, it should be "bench bled" before installing it in the vehicle. This involves filling the reservoir with fluid, connecting rubber hoses to the brake line ports and placing the other end in the fluid reservoir, then operating the master cylinder piston. This make sure all the air is out of the master cylinder itself before installing it. Since you have already installed it, you should try bleeding fluid at the master cylinder, then work your way around the vehicle and bleed the system from each wheel again. If you do not have a bleeder, have a friend assist you. Have your friend pump the brake pedal 2 or 3 times, then hold the pedal. Crack a brake line loose at the master cylinder, making sure your helper does not press the brake pedal completely to the floor as you open the brake line. I usually place my other foot under the brake pedal when foot-bleeding. Repeat this 2-3 times with each brake line at the master cylinder, then re-bleed the system from each wheel, making sure to start at the wheel furthest from the master cylinder and finishing at the closest. If this does not help, then try removing the master cylinder and bench bleeding it, or have a certified technician look into the spongy brakes for you.

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
  1. Home
  2. Questions
  3. My car brakes are spongy

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: Cleaned air mass flow light was red . now unplugged or plugged in . started noticing car was dying at red lights and stumbled high

It should be safe to drive a short distance to purchase a Mass Air sensor. As long as the engine is not stalling or overheating and take it easy driving you should be fine.

Q: Brake pressure problems

One of the most common causes of the brake pedal going to the floor is a loss of brake fluid. Generally, this is easy to detect due to the fact that there is usually brake fluid leaking on the ground...

Q: Advice on buying a car in 5,000 CAD range

Look for Honda Civics and Toyota Corollas. Stick to that and forget the year. Buy one that you can find with that price range that checks out to be good. Never put a year cut-off, because that limits your options...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...