Quote:
Originally Posted by Buxexanic
That was my other thought. Since the brake pedal doesn't soften up when depressed is it safe to assume the master cylinder is good? Car is reaching 150k should I just replace it anyway since I have to take it off to get to the booster?
|
I am not sure what year and engine model you have but you will want to check out the vacuum related potential causes for failure first. For example on the 4.6is X5 there is a check valve and hose that runs off of the engine. When the hose gets soft from age and deterioration it can affect braking by collapsing and the check valve on the vacuum line can fail. Look your model up see how its situated before ripping out the booster. BMW boosters usually last a very long time easily over 200K.