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Discussion Starter · #1 ·
My brake booster is taking a dive. Even tho the line for it is 100% good, the fluid is brand new and there is no leaks, the pedal always feels soft. I think it's the brake booster, and since I like my brakes firm and precise, I think an upgrade is do.

I would never spend the money to go fully aftermarket. I want a FACTORY HONDA upgrade. I know there is a 15/16 upgrade, but I want the best there is without modification. I do not want to 'custom' anything. I think the best is a 1" or something from a prelude, but I'm not getting any good results on honda tech. Maybe I'm not looking right, so I'm asking you guys.

Aswell, what else should I replace when doing this other then rusty lines?
 

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If the brake booster failed, you would have to press really hard to make the brakes work. I'm thinking your master cylinder has failed. If you are planning on upgrading the size of your calipers, then you might want to consider going with a 15/16" master cylinder. If you are not upgrading the size of your calipers, stay with the stock size.

Either way, buy a *brand new* master cylinder. Never take a used master cylinder from the junk yard.
 

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stick said:
If the brake booster failed, you would have to press really hard to make the brakes work. I'm thinking your master cylinder has failed. If you are planning on upgrading the size of your calipers, then you might want to consider going with a 15/16" master cylinder. If you are not upgrading the size of your calipers, stay with the stock size.

Either way, buy a *brand new* master cylinder. Never take a used master cylinder from the junk yard.
I agree. If it was your brake booster the pedal would be really hard to stop. So hard that you might even need both feet on the pedal. Does the pedal sink at stoplights? Do some master cylinder test to see if that is the problem. Also just to make sure check where the brake line screw into the caliper and make sure the bleed screws are not leaking.
 

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Discussion Starter · #4 ·
I'm not loosing fluid, and I've gone over all the lines. The pedal is very hard at the bottom and the car feels very 'heavy' thru the brakes. I have to press hard after it sinks all the way to the bottom. And the pads are fairly new along with the rotors. Lots of life left. But if I'm gonna do work I'd rather replace with the best. I am planning on going EX brakes soon enough (if I ever find one at a good price).
 

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if the pedal is sinking to the bottom its your master cyl....or you have air in the lines. I had a mc that a very very small leak inside the booster. I never saw any brake fluid until I pulled the mc out and it came running out.

its alot more common than a booster going out. Like it was said if you booster went out your pedal would be very stiff.
 

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With that said, your best bet is a Civic EX booster, or the booster from a Prelude 88-90 I believe. You could also use the 90-93 Integra MC, but you will need to use the booster from that car as well.
 

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Take your car to some place where the ground is level(make sure there is nothing you could hit if your car would roll for some reason). Pump the brakes till they are stiff. It shouldn't take more than three pumps. With the engine still running press the pedal firmly. Not mashing it but also not putting any weight on it. If the pedal sinks then your MC needs replaced.
 

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Discussion Starter · #9 ·
Oh, I should mention, that when I pump the brakes once when driving its goes straight to the floor with very little response from the brake, but if I let off and press again it's higher up and stiffer/harder to brake. I just want safe brakes. I'm gonna re-bleed all my lines but I think I'm gonna do the prelude master cylinder conversion. This will be a straight bolt on right, and what is the size of the cylinder vs. my stocker?
 

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george34 said:
I think most people use the civc ex MC(direct bolt up). It is either 15/16'' or 1'' I can't remember which one it is.
It's 15/16"...and it's the same MC as the one on the 89-91 Prelude 2.0Si. When in doubt, you can always cross reference the part numbers on www.hondaautomotiveparts.com
 

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90crxhf_w/ZC said:
or you can go with the g2 integra, im pretty sure it will work, correct me if im wrong!!!
the 90-93 Integra MC will not bolt into a Civic/CRX. the flange where it bolts to the brake booster is reversed, so you would need the Integra brake booster as well.
 
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