I just replaced my master cylinder on my 4wd wagon with the 15/16th cylinder from a older prelude. I bought the cylinder from the junkyard so I'm not sure of the condition but it looks really clean. I also am using rotors and calipers from a 97 ex and 91 ex front knuckles.

When I am slowly stopping my pedal will slowly keep going to the floor. If I jam it it will lock the wheels up but slowly applying the brakes will eventually go to the floor. Sometimes I need to release it and push it down again to fully stop. With the stock master cylinder it acted sort of like this but I thought that was because of the bigger caliper and 7/8th master cylinder. Doe this sound like the MC is shot or could I have missed some bubbles?

 

master cylinder is bad.

 

you replaced it with a used MC? and wondering why your pedal sinks?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pandarex &raquo;</TD></TR><TR><TD CLASS="quote">master cylinder is bad.

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x2.

or you have an external leak.

replace that old MC anyway.

 

I will rebuild it, and see if that fixes the problem. I don't feel like shelling out $200 for a new MC. Unless I can find it for ~$100.

 

Got a new one for 60, just put it in It's all good now.

 

I bought a used Booster/MC off a 90 Civic EX, I hope I have better luck!