Brake booster interchange?

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littlecrxVTEC

Junior Member
Ok, first off... I've been reading about every brake swap ever imagined for about the past 2 hours :eek:

I know that the 91 EX brake MC (15/16) will directly bolt onto my 89 CRX Si booster. I know this because i used to have one on my car and I didn't like the increased pedal effort with the stock booster. I'm sure you know already, the stock MC for the CRX is 13/16.


Without going into too much debating about brakes, I still have a couple questions tho:

1. The 91 EX brake booster is larger than the stock 89 CRX Si booster, right?

2. Will the 91 EX brake BOOSTER bolt directly onto my 89 CRX Si?
(assuming I can bend the harlines to fit the new position)

3. If using the stock MC (13/16) with the larger booster from the 91 EX, would the pedal effort feel absolutely too soft/spongy?

Yes, I realize that this combination will not actually increase braking performance...please don't go there. lol.

I am making an effort to lessen the pedal effort slightly in the rex. It's daily driven and it always has had a bit stiffer pedal feel than I'd like. Thank you!
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1. I believe they're the same

2. Yes. Hardlines are in the same position.

3. Don't know, but I'd probably say yea. You'll probably lose some pedal feel.
 
1. I believe they're the same....



3. Don't know, but I'd probably say yea. You'll probably lose some pedal feel.


So, umm. If they are the same size booster, and I use the stock master cylinder, nothing would be different. So how would that accomplish the softer pedal feel? lmao :huh:

Can anyone confirm that the brake boosters from the 89 CRX si and 91 EX are the same size or not?

THANKS
 
Last edited:
For 3, you didn't say anything about the stock size, you said a larger booster. ;)
 
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