Losing Pedal Pressure

[bbhondacb793]

So when I am coming to a stop I have good full pressure but once I actually stop the pedal slowly creeps closer to the floor. I can let up and there will be pressure again but not long after it will happen again. Any ideas? My fluid is good I just checked... I have about less then 3% left on my front pads; possible culprit? I am doing the ROH with the Vtec rotor and caliper upgrade this week, I am almost debating putting in a new MC and possibly booster? How often do these parts go?

[TypeG]

it's your master cylinder. later.

[bbhondacb793]

Are there any tests I can do to make completely sure before I replace the the MC that it actually is the MC and not something else small.

[cokinut]

it's the BMC (brake master cyl). happened to me too. the seals just get worn out. If your fluid is topped off and the pedal goes to the floor, then it is most likely you problem.

[bbhondacb793]

Thanks guys for the input!

[Ronald_Type-R]

This happened to me about last month actually..EXACTLY like how you described it...Happened for about 2 weeks or so..Scariest driving ever, when your brake pedal starts creeping closer to the floor..I thought it was my brake fluid..Kept on thinking I have bubbles in the line or something..Ya kno, hot summer days, old fluid, maybe they evaporated or something ya kno? Ppl told me that it's my BMC tho..But I dunno, it only happens when I brake slowly..Like when I'm coming up to an intersection where I have to stop kinda thing..But if I jus step on it (panic braking, whatever you call it), it won't lose pressure on me..Weird eh?

But ya kno what? After about 2 weeks, the problem just magically disappeared!! No joke, been driving ever since, without replacing anything, and it never happened to me again..I don't know what it is, but it's holding up fine 'til now..

So I dunno..How long has it been happening for ya? I wouldn't risk anything by saying wait 2 weeks or anything like that hehe just sharing my experience..But since you're upgrading the calipers, you're going to have to put in new brake fluid and bleed it anyways right? I'll say do that first (Properly of course), and if you're still experiencing the same problems, THEN you'll know for sure that it's your BMC

Hope that helps man..G'luck with solving the problem!

Ronald

[91whitecb7]

you have a leaking primary cup in your master cylinder. replace the master cylinder and it'll fix the problem

[cp[mike]]

yep, BMC. fluid slowly leaks back past the primary cup (never heard it called that before). while you have it all disconnected, throw a new MC in and youll be good.

[Accordlx]

my car have the same prob....glad u brough it up..

[Minze]

Happened to me also, I just replaced the master cylinder and I'm good.

[elositocandela]

i have the same freaking problem lol, i think im going 2 have to replace it, is it hard 2 replace by yourself or do u need a mechanic for that?

[Ronald_Type-R]

Hmm am I the only one who survived this problem? Hahaha 'coz seriously, after 2 weeks, this problem jus disappeared on me, and it has not happened ONCE ever since...And that was more than 3 months ago...Interesting..

I'm still replacing mine in 2 weeks, but only 'coz I'm upgrading it, not fixing it hehe..

I honestly don't think it's too hard to replace it by yourself..Jus make sure you bench bleed it before you install it tho

Ronald

[bowzil]

So, what is the problem when your car slide to the right side whenever you brake? The previos owner of my car just did brake service for this car and it cost $450.00

Thanks

[Ronald_Type-R]

That one my friend, sounds more like an alignment problem At least I think so n e wayz..I could be wrong though..Anyone wanna confirm on that one?

Ronald

[bowzil]

That one my friend, sounds more like an alignment problem At least I think so n e wayz..I could be wrong though..Anyone wanna confirm on that one?

Ronald

I hope you are right.

Thanks