Skip the auto shop - Our mechanics make house calls

Q: All four brakes locking up after being driven for about 45 minutes

asked by on

After driving about could 45 minutes the brakes won't release causing them to get hot. Let it sit and they will release
My car has an automatic transmission.

A: Hi there, if work was recently done on the ...

Hi there, if work was recently done on the master cylinder or brake booster, check to see if the brake push rod (manual or power assisted) has too little free play. If it is too tight, the master cylinder piston could be partially blocking the return port. If the brake fluid reservoir is too full, this can cause hydraulic brake drag. A weak or failed metering valve - a valve intended to keep a small amount of pressure on the front disk brakes only, could be causing a small amount of pressure on all of the brakes temporarily as you are experiencing. I would recommend having an inspection done on your dragging brakes by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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: Truck using too much fuel - 1995 Dodge Ram 1500

A variety of faults can cause your 1995 Dodge Ram 1500 to use excess fuel. The most common would be fuel leaks, EVAP system leaks, a leaking fuel injector, oxygen sensors, vacuum leaks, or a misfire condition. Faults such as...

Q: Shaking when brakes are applied

If the dealer has already replaced the front rotors, the problem is likely with the rear being warped. The problem could also be a bad wheel bearing, but my money's on the rear rotors. I suggest you have someone other...

Q: My abs light came on,brake pedal goes to floor but seems like only front is grabbing

Hello. If you are losing brake fluid, then there is a leak somewhere. Look for wet areas indicating where the leak may be. You may have blown a wheel cylinder of a brake line somewhere on the truck. Have a...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...