does this make any sense to you ????

[bulldogs3d]

i have a 93 auto sho the brakes will work fine then i will park come out and no pressure but no fluid is missing i was going to change the master cylinder but napa gave me the wrong one but before i noticed that i had already taken the brake lines out of the m.s. i hooked it back up and filled it the brakes worked fine now every month the brake pressure will suddenly go and i drain the m.s. fill it and they r fine i will replace the m.s. if this the problem but if it's not i dont want to spend $250 to find out. if anyone knows what this is i would appreciate it

thank you for your help

 

[ohfosho]

the master cylinder drains? where does it go?

 

[NJSHO]

Punctuation please.

From draining the MS so many times, I bet you have air in your ABS system. You either need to get an abs bleed tool, which is a computer that hooks up to your abs computer and cycles the valves and pump, or take it to ford and have them bleed the abs system for about $100.

 

[bulldogs3d]

that might be it my abs light is on i'll try that thanks