Low brake pedal

[ctrlraven]

I guess I will be adding a new MC to my list of things to replace.

[2vmodular]

do you still have around the old defective master cylinders that you removed?

if you do, could you disassemble them and take a look inside at the condition of the piston bore? do you see any scratches inside? are there any visible defects on the cup seals? how dirty was the brake fluid that drained out of the master cylinders?

I have replaced the MC on 2 of my 5 CV SP /MM with 100% success when all else as you have described failed to take up the slack in the brake pedal. 2 more new NAPA (LIfetime warranty less than $130 each) MC sit on the bench awaiting some shop time. The fifth car, a 04 MM DTR has only 15k miles and the brakes are rock hard. Maybe the factory MC just have short life.

[Colt]

At work I drive 2008 to 2010 CVPI's. The brakes are great. My 2004 MM not so much.

I have thought about booster and Master Cycl swap from a CVPI on my MM.

Anyone know if the current 2007+ CVPI's use the same front and rear brakes as the MM?

The CVPI's are great, where my MM brakes seem to have some creep/spongy feel vs a tight feed back.

[2vmodular]

the 2007+ cvpi's use the same brake calipers and flex hoses as the 2003-2004 marauders.

the 2003+ crownvic power brake booster does have a feature in it called mechanical panic assist. basically if you press the brake pedal really fast, you get a lot of extra vacuum assist so that the antilock brakes are sure to engage. the 2003-2004 mercury marauders do not have this feature and use a 2001-2002 civilian crownvic power brake booster instead.

for your situation, you might try replacing just the master cylinder and seeing if your concerns resolve.

At work I drive 2008 to 2010 CVPI's. The brakes are great. My 2004 MM not so much.

I have thought about booster and Master Cycl swap from a CVPI on my MM.

Anyone know if the current 2007+ CVPI's use the same front and rear brakes as the MM?

The CVPI's are great, where my MM brakes seem to have some creep/spongy feel vs a tight feed back.

[2vmodular]

if you do need a power brake booster, tell the parts person that you have a 2001 crown victoria police interceptor. these have a little different air valve calibration inside than the 2001-2002 civilian crownvic boosters that were used in the 2003-2004 marauders.

you cannot use a 2003+ crownvic power brake booster in a 2003-2004 marauder without swapping out the pedal box. the brake booster pedal rod is wrong and your brake pedal will be way too far off the floor.

if you want to swap out pedal boxes, read this first:

http://www.p71interceptor.com/powerpedals/

your 2003-2004 marauder uses the same pedal box and booster that i pulled out of that 2001 grand marquis. and that 1998 crownvic power brake booster has the same pedal rod as the 2003+ crownvic boosters.