Skip the auto shop - Our mechanics make house calls

Q: Hard brake pedal and rear brakes locking up.

asked by on

I had an issue with a spongy pedal so I replaced my rear wheel cylinders as it felt like my back brakes were grabby. I got the new ones on and had absolutely no brake pedal. Trying to fix the problem I put a new master cylinder, brake booster, a brake line I found was leaking, a booster check valve and bled the brakes a whole bunch of times. My pedal is now hard and it seems like the front brakes aren't doing anything and the rear brakes want to lock up unless you barely tap the pedal. I've since dropped it off at the dealership but would like to know some possible causes of the problem.

My car has 223000 miles.
My car has an automatic transmission.

A: Hi. I will help you with this issue you are...

Hi. I will help you with this issue you are having with your 2001 Durango. Unless you bled the master cylinder, it is possible there is still air in the system. If you car is equipped with ABS, air could have also gotten trapped in the ABS modulator. If ABS equipped, a bi-directional scan tool would be essential to manually activate the ABS system to clear air from that segment of the lines while you are bleeding the system. It is also possible that in all of this work somehow the proportioning valve has been affected causing the desired pressure differential, front versus back, to get out of spec. Using a 2,500 PSI gauge, you can check the pressures at each wheel and that will definitely give you a clue as to which brake circuit is the issue (or both), whether the proportioning valve is working properly and whether the line pressures at each wheel are within spec. Should you need a second opinion, by all means feel free to contact YourMechanic for assistance and we will diagnose and repair the issue 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

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: Is my transmission going in my car?

You need to have the computer tested for codes and the engine checked for a vacuum leak to the brake booster. This would account for the high idle and lack of brake power assist. The most likely cause is that...

Q: Random gear shifting

Hello, it sounds as if you have a faulty transmission pressure control solenoid or contaminated fluid. Also, the electronic gear shift sensor under your gear shift could be compromised if something has spilled on it. I suggest that you have a...

Q: Is it my motor mount

Hello. Unfortunately a bad engine mount will not cause this. Most of the time this is caused by a bad crankshaft position sensor or a failing fuel pump. Most of the time when it just cuts off like this it...

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 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.