Master cylinder problem

[mrbaddakota]

Has anyone else had a master cylinder failure on a 2002 Dakota 4x4 or any Dakokta? Two days ago I was headed to my in-laws for thanksgiving and about 200 miles from home I was going over a pass 7500' when to use to brakes and they went to the floor. Thank God they still worked alittle. I have 62,000 miles on it. Must say I'm not to happy.

[DaPurpleRT]

Wow, never ever heard of that happening but it must have been scary as hell!

[mrbaddakota]

You want to hear something crazy, I ordered a master cylinder and it came in about three days later, I picked it up and was going to install it on Saturday on Friday I went somewhere in it and the brakes where back. So I bleed the brakes found air in right rear on first pump up, so I blead the others and now I have better brakes than ever. Go figure.

[04dak]

You seem to have found the effect now find the cause.

Where did the air come from?

make sure you have no leaks. if you can't see any remove the M/C from the brake booster and look down insid the booster if you see fluid the master is bad (primary pistion secondary seal).