Q: Locked brakes - 2004 Cadillac CTS

asked by on

Gf said she was driving down the road and car all the sudden. Wouldn't go over 40 mph. Car smelled hot she pulled over. I checked the car out and the calipers were locked on front driver and rear passenger. I though by some freakind chance they went at same time and replaced them. When trying to bleed the calipers they locked again. I'm thinking it is the Ecbm but I'm not sure. Check engine light is on but abs is not. Can't take anywhere to get scanned and to have someone out to scan it will cost about 1/3 of the replacement ecbm. Any advice of what else could cause that issue or if a failing brake module can lock up opposite tires like that?

My car has 170000 miles.
My car has an automatic transmission.

Hi there. From the description you have provided, your vehicle’s left front and right rear caliper locking would have been a combination/proportioning valve before ABS (anti-lock brake system). The EBCM (electronic brake control module) controls the valves in the hydraulic modulator. It could be that the EBCM or hydraulic modulator is at fault.

It could also be stuck brake master cylinder check valve if the modulator is designed for diagonal braking. Braking systems used to be controlled front to rear. The engineers incorporated diagonal braking to balance the braking system. Your vehicle’s Check Engine Light being on should be addressed, although it is unlikely that it is related to the braking system. The ABS computer should be accessed to help determine the cause of the left front and right rear caliper locking-up.

I recommend having your vehicle’s locking brake calipers inspected and repaired by a certified technician, such as one from YourMechanic.

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. Locked brakes - 2004 Cadillac CTS

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: Q: Why is my key stuck in the ignition?

Hello. There are a few reasons the key may be stuck in the ignition. The first step of course is to make sure the steering wheel is not locked. The easiest way to get the key to release is likely...

Q: Car shimmies when braking

Hello, there is a good chance that you have warped rotors. Warped rotors can occur due to overheating or the rotors being too thin, but most often, it's a combination of both. Warped rotors should be repaired sooner than later,...

Q: Car hesitating on acceleration.

Thanks for writing in about your Mazda 6. You need to make sure that the mass airflow sensor is not getting contaminated by an oil type air filter. If it is, replace the air filter with clean paper type one...

Related articles

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 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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...