I've been having trouble with the brakes in my 1990 Honda Civic EX, getting the squishy pedal at stoplights, so I thought it might be the master cylinder, but I haven't done anything about it yet. However, now that the weather has been colder, I haven't been getting the squishy pedal at all or any other problems with the brakes. Any idea what's going on here?

 

I had the same problem and it was indeed my brake master cylinder. I put in a 15/16 bmc out of a 1991 si hatch. Brakes are amazing now.

 

Squishy?
Or did the pedal sink to the floor so that you had to lift your foot and press again?

 

Yeah, that's what I'm talking about.

 

I was under the impression that:
STD, DX, HF - 13/16" master cylinder
Si - 7/8" master cylinder
90-91 EX sedan - 15/16" master cylinder

Either way, if you're going to replace your Brake MC, replace it with one for a 90-91 civic sedan EX. It should say 15/16 on the side of it, easy brake upgrade.

 

Then that is an MC going bad.

 

Thanks for the info.

Any reason why it's not being problematic in the cold weather though?

 

I'm you're correct. I have no clue lol.