Q: Soft brake pedal after replacing rear brakes and master cylinder 2003 Audi A4
Changed rear brakes in vehicle, afterwards had a soft pedal. Suspected it was a bad master cylinder, replaced master cylinder. After replacing and properly bleeding master cylinder, problem still persists. Soft pedal. Removed calipers and there is no pressure to the rear brakes at all. Very lost on this one. Any advice would help!
My car has 102000 miles.
My car has an automatic transmission.
Hello. If you have no pressure to the rear calipers at all and if the master cylinder is new then you may have forces some debris into the ABS unit when you compressed the pistons in the rear calipers. In some cases the system can be pressure bled to fix it but it may need a new ABS unit.
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
What others are asking
What does the odometer do?
Your car’s odometer does one thing – it shows you the mileage on the engine. This number cannot be changed. In fact, it’s against the law to tamper with your odometer. There are two trip odometers available that can be...
Broken intake gasket
Intake gasket replacement is an involved job, but it's not such a huge task that it's worth junking the car over. It calls for 4.6 hours of labor. If the car is otherwise in good shape, I would suggest having...
Battery completely died out twice
The battery is leaking out of the top near the posts and will cause the terminals to get corroded. I suggest having your battery and cables serviced (https://www.yourmechanic.com/services/service-battery-cables): have the cables cleaned of corrosion have the battery replaced have the...
engine cranks will not fire, why?
My best guess would be the crankshaft position sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-crankshaft-position-sensor). I have seen this part fail before without setting a code. It is located on the left side of the engine block, (front of car). It is near the exhaust...
My Oil Pressure Light blinks when I come to a stop. What's wrong?
This is likely a sign of low oil pressure, which is usually caused by a leak or low oil levels. I would start by checking your oil to be sure the oil level is at the appropriate capacity. You should...
Transmission modulator valve is not working.
Hi there. The modulator valve is located on the back of the transmission on the passenger side. The valve is vacuum controlled. So, before you replace the valve, be sure to check the vacuum line from the engine to the...
Audi A4 B8 chasis 2.0 tfsi Running rich
There are just a few things that will make your car run rich, you have already replaced the MAF, so that leaves the Coolant temp sensor,(CTS) the Throttle position sensor(TPS) and the fuel pressure. The temp sensor and the throttle...
Just rebuilt the transmission and after picking up the car it's making a vibration . 2006 Acura TL
Hi there - a key question in resolving a vibration issue (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-engine-mount) is "Is the vibration related to vehicle speed, or engine speed?". If the vibration comes from the engine, even if the car is not moving, there could be...
Car won't start - rapid clicking sound - new battery
It sounds like you may have a faulty starter solenoid (https://www.yourmechanic.com/services/starter-replacement). If you hear a clicking sound when turning the key, it is likely that your starter solenoid may be faulty. The starter solenoid is located on the starter and...
Related articles
A Buyer’s Guide to the 2012 Audi A5
For For drivers who want a comfortable ride, expert handling and luxurious amenities, the 2012 Audi A5 will certainly fit the bill. Designed for performance and to deliver a gorgeous look, this model offers an array of options and features...
A Buyer’s Guide to the 2012 Audi A6
The The 2012 Audi A6 provides the perfect combination of comfort and power. The contemporary design answers the need for great options and plenty of tech for today’s younger drivers that aren’t quite ready for those early bird discounts. Key...
Understanding the Audi Service Due and Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Audi Service Due light indicates when your car needs service.
Browse other content
Estimates
Cities
Services